DE1226165B - Circuit arrangement for telecommunication switching systems, in particular telephone switching systems with multi-level switching networks - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

H04q

German KL: 21a3-38

Number: 1226165

File number: S 92601 VIII a / 21 a3

Filing date: August 12, 1964

Opening day: October 6, 1966

The invention relates to a circuit arrangement for telecommunications switching systems, in particular Telephone exchanges with multi-level switching networks in which those with lines (e.g. local and long-distance lines) connected outputs of couplers of a last coupling stage each Accessible from the entrances via various alternative routes that can be selected by searching for a route are, and with bundles of lines that combine the lines in particular depending on the direction and of which the ones suitable for reaching a specific destination in one of This dependent order of precedence can be selected for the purpose of occupying a free line.

If connections are established via such switching network-like switching systems, it is im Interest in the highest possible utilization of the lines and coupling switching means provided essential that connections via the switching matrix ζ. B. switched through from inputs only to such outputs that are also free and assignable, e.g. connected to a free, assignable line are. There are now switching systems of the type mentioned, z. B. for telephone purposes, known in which for this purpose to switch through a connection via a switching matrix to incoming Assignment of one of its inputs first of all one of its outputs is determined by the fact that a free line leading in that direction in a direction desired by the calling subscriber is selected; then free switching means, z. B. Crosspoints in couplers of the various switching stages and free intermediate lines in the switching network determined that can be used for a through-connection, and it is over a certain path through the switching matrix a corresponding connection switched through.

Since it can happen that after pre-selecting a free line in the desired direction, a Switching through in the switching network is not possible to this free line due to internal blocking and that a connection to other free lines would be possible, that is, one possible in itself Connection cannot be established, an already known circuit arrangement was used for Control of switching matrices developed when searching for a route between a certain, arriving occupied input and several outputs, connected to the lines leading in the desired direction are, all free paths in the switching matrix from this entrance to those determined by the choice

Circuit arrangement for telecommunications switching systems, in particular telephone exchanges with multi-level switching networks

Applicant:

Siemens & Halske Aktiengesellschaft,
Berlin and Munich,
Munich 2, Wittelsbacherplatz 2

Named as inventor:
Walter Villmann, Munich;
Dipl.-Ing. R. Kahler, Munich-Solln;
Dipl.-Ing. F. Openler, Munich

Checks exits with regard to this and selects whether the respective exit, to which in each case a path is also free. The route search and route selection in the switching matrix thus covers all routes in the Switching matrix that lead from the particular incoming occupied input to outputs that both determined by choice and also verifiable. By choosing certain outputs will be marked for this. This known circuit arrangement contains a route search selector, through which in a first search selection process a path between, on the one hand, the coupler of the first coupling stage which the incoming occupied input is connected, and on the other hand a coupler of the last coupling stage is selected, at the outputs of which at least one free, marked line, i.e. one Line of the selected direction is connected; by this selection of the last to the coupler The intermediate line leading to the coupling stage is a coupler for the through-connection and a the outgoing, free lines connected to its outputs for the assignment for this connection certainly. The known circuit arrangement also contains a so-called "place selector", i.e. a search dial, which in a second search selection process from the outputs of the in the first Search selection process selected coupler selects a wired with a free marked line. This known circuit arrangement is

609 669/83

3 4

it is possible, if there is a mediation agreement, according to which they are in each case

Slowly, all free lines of the desired ones are to be used for selection.

Switching direction as well as all paths in the process. For example, three locations, B and C via three

mediation network to take into account that to these direct trunk groups 1, 2 and 3 from a location Z

Route lines somehow. 5 can be reached, furthermore the locations A ₁ B and C

In a switched network, many are now connected to one another by a mesh network. For number of switching systems z. B. the described connections from location X to location A can follow Art. Provided, and connections between the Gende trunk groups in the following order of priority participants who are to be drawn on switching systems for selection: 1, 2, 3. For Verdener places (e.g. districts On the other hand, connections from location X to location B can be connected via lines between two following line bundles in the following tiered switching systems. The lines should be used for selection: 2, 1. For Vergen between the switching systems, connections from location X to location C can form but following line bundles, ie the switching systems seen from each of the two connecting line bundles in the following order of precedence one direction is to be used for selection: 3, 1, 2.
speaks. Several switching systems at several. The object of the invention is to connect the circuit arrangements mentioned at the outset to one another in locations by a number of trunk groups. The trunk groups form the possibility for switching systems to create a network, the structure of which can be star-shaped, mesh-shaped when searching for a route in a switching network, and can also be mixed. Networks with a regular ranking order in which the bundles of the mixed structure adapt optimally to the individual traffic needs connected to the switching network. For connections, depending on the particular location to be controlled between subscribers of switching systems, different locations are now generally to be taken into account. This should dene transport options. A connection can be as the connection of lines to the outputs of the except via one or more line bundles (after-coupling field freely, so that lines in through connections over several rather bundles arbitrarily to outputs of different switching systems lying in series), which with upstream coupler The object of the invention is achieved in that men, also made via other trunk groups, are connected to a specific input, which represent a detour that only leads to path search potential In particular, it should be expressed in a fan-like manner when the line-wide all bundles of lines that can be reached via free intermediate lines, which represent the direct route, are occupied. bar coupler of the last switching stage marked that So are for a traffic relationship (required also among the lines that on the one hand to the connections between two switching systems 35 to reach the respectively selected destination appropriately different locations) often belong to the direct Neten respective trunk groups and the There are also several detours via different lines, on the other hand via bundles of lines marked by path search potential. The use of Um-couplers are, a free line from the one because of the fact that the said trunk group is busy is selected, the direct route is desired; the detours 40 are also to be preferred to one another with regard to the route through the destination (destination 1). Here, a certain order of precedence plays the first one, in which, as is known, from the economic point of view, at least one free line (e.g. the role essential to the test. In a network that corresponds to the organizational pointLigl) is available that is purely from a pure line Starting from the star network, the line selected in this way is also the coupler that is built and for which a concealed mesh network is determined over the last coupling stage, via which the shift is, one speaks of the above-mentioned connection is to be switched through, and that after a direct route as of that first cross-line bundle selection of a single route from the specific and, in the case of the detours, the series input to this coupler a corresponding sequence in which they are to be preferred for assignments, binding from the specific input via the last of the second, third, etc. cross-line bundle; the 50 named coupler to the selected line last detour usually provides the so-called through-connected.
Key figure route or the main direction. The invention makes the route search in one

Can be brought under the influence of criteria by the switching system on a switching network, agreed place connections to many other places, which in the structure of the switching matrix are not analogous also referred to as destinations, each of which needs to be expressed over several 55: The paths that come together Line bundles are established, so initially leads to all paths of the switching matrix unseen Usually a certain trunk group on the one to all of its outlets, i.e. lines from for Direct route to the desired destination in each case; a line suitable for interconnection or lead several other trunk groups, e.g. B. extend bundles of services, mark all over the Accessible via switching systems at several other 60 switching networks from the occupied entrance Locations in through traffic, over more or less lines; then in the after the ranking winner economically favorable detours. follow the first of the ones in question for a connection

For the control of each of the target locations from an inbound, at least one free line identification system from each come a certain holding bundle of cables a free line all out connected trunk group in question. Im 65 elects; thereby the search for the way becomes on the ways in Interest of an optimal economic efficiency exists coupling field, which to the with this selected Leiunter lead to the output connected for each destination in question, restricted and Line bundles are also used by the destination for a route selection. These

The route selection in the coupling field that extends to the restricted route search is now taken into account under among other things also the named target-specific ranking order, which in itself in the switching matrix and his Route search network does not need to find any logical expression. This advantageously enables despite the introduction of the preferential order of precedence, the facilities for finding the way and! Route selection to keep free of additional effort for this in the switching network.

Changes in the destination ranking order for connections in question can also be made Coming trunk groups are made in an advantageous manner without the facilities also have to be changed for the route search and route selection in the coupling matrix.

In the F i g. 1 to 6 and 8, an embodiment of the invention is shown to which the same however, is by no means limited. FIG. 7 shows an application for such an exemplary embodiment the plan of a small part of a larger telephone network.

In Fig. 7 shows the plan of a telephone network with a star-shaped basic concept and a superimposed mesh network. And located in a star-center center O is connected via a star network with additional centers B and C. Telephone exchanges are located at the aforementioned © points. The lines connecting them each represent trunk groups. Furthermore, a location X is shown where there is also a telephone exchange. The systems located at locations A, B and C, in future only referred to as control centers A, B and C, can be reached from the system located at location X , in future called control center Z, via a total of three trunk groups BdI, BdI, Bd3 . From the location of the control center X , the control center A can be reached via the trunk groups BdI and Bd3 in such a way that lines of the trunk group Bd 3 are occupied only when all the lines in the trunk group BdI are busy, via the detour connections via the control center, which is used as a transit office in this case C and via which this bundle of lines connecting directly to the control center A can be established.

In the same way, the control centers B and C can now also be reached from the control center Z via lines of a direct line bundle Bd2 or Bd3. If the trunk group BdI is busy, the control center B can also be reached via the trunk group BdI in a detour via the control center A. If the trunk group Bd 3 is busy, the control center C can also be reached from the control center X via the trunk group BdI via the control center A.

From the above it can be seen that for the control of the control centers B and C from the control center Z, the trunk groups BdI, BdI and Bd3 are in a certain order of priority, which determines the overflow when all the lines of a trunk group are busy. The term "overflow" for switching technology is generally known in the specialist literature. The order of priority of the trunk groups is with regard to the center B: BdI, BdI. The order of priority of the trunk groups is with regard to the control center C: Bd3, BdI. Centers B and C will be referred to as target points 1 and 2 from now on.

The lines of the line bundle Bd 1, BdI and Bd3 are connected to the outputs of the switching network KF shown in FIG. The in F i g. 1 in an overview and in FIGS. The switching system shown in detail in FIGS. 2 to 6 and 8 takes into account, among other things, the order of precedence in which the trunk groups are controlled, as explained above and determined by the respective destination point. In Fig. 1 shows that per se known counting pulse generators Zig are provided, which are required in large numbers for a connection. Will

If a counting pulse generator is initially occupied when it arrives, a free memory Sp is connected to it via a search selector SwI in order to receive the dialing information. After the election information has been recorded, a corrector Um is requested. One or more correctors Um can be provided. One each is available in common for several memories, and each is connected to a central marker Zm . The corrector Um receives the election information from the memory Sp and determines the information

ao about the tariff, which it transmits back to the counting pulse generator in a known manner, and the setting information which it transmits to the central marker Zm.
The switching network is divided into four switching levels, each

a5 stage relay couplers (XlIl to K4n6 in Fig. 2). The in F i g. 2 shows that the couplers of the first and second coupling stage on the one hand and the third and fourth coupling stage on the other hand are combined in groups. Only within such a coupling group are all couplers of the third (or first) coupling stage connected to one another by intermediate lines with all couplers of the fourth (or second) coupling stage. Like F i g. 1 shows, each coupling group comprising the third and fourth coupling stage - also referred to as output coupling group (AKG1 to AKGn) - is assigned a setting set (ES1 to ESn) .
Due to the received from the corrector A parking information of the Zentralmarkierer cm causes all those setting sets, is to turn it on, lines are connected to their associated output coupling groups that are each a required connect somehow in question. The central marker first determines in which bundles of all of the aforementioned lines at least one line is free which can also be reached at the same time from the occupied counting pulse generator Zig via the switching network KF .

For this purpose, route search potential is given by the corrector via the relevant counting pulse generator to a route search network of the switching network KF . Line bundles in which at least one outgoing free line that can be reached via the switching network KF is determined, are available for establishing the connection. The central marker then selects from the activated setting sets that (eg ES1) to whose assigned output coupling group (eg AKG1) the first available bundle according to the previously explained order of preference determined by the target point is connected. At the same time, the last-mentioned bundle is determined by the central marker Zm in the one output coupling group. A free accessible line (line) is then selected from this in the setting set. Then a path is selected in the switching network KF for switching through the connection via this line and the connection is

7 8

switched. Thereupon all the central ones turn on and the output can be interconnected. Each intermediate link from the search selector Sw 1 to the setting set, line contains some signal cores, e.g. Holding wire for the coupling relays and a route search

The search wire symbolically shown as a rotary selector.

Selector SwI and Sw2 can also be used as couplers, for example in Fig. 3 of all coupling stages KA to KD

Relay couplers, which are known to have one and one of all intermediate line fields each have a substantially shorter switching time. point or one intermediate line each is shown. In

Using the description of FIG. 7 (see above) let F i g. 3 on the left is indicated by the indication Zig , now below the mode of operation of the in the io that here the connections to the couplers of the first F ig. 2 to 6 described in further details coupling stage KA individually to counter pulse generator Zig switching elements. are connected. In Fig. 3 above is for one

The F i g. FIG. 2 shows the grouping of the switching matrix, umpteen paths running through the switching matrix which are also shown in FIG. 1 hinted at a signal wire, z. B. speech artery shown. As is reasonable. The switching matrix in FIG. 1 with KF proves that two speech wires are provided, they are marked, has single-stage couplers Kill to K4n6 coupling contacts with α 1/2, bl / 2, cl / 2 and dl / 2 . These are shown in a first and a second coupling. The multiple characters next to the coupling stage on the one hand and in a third and fourth coupling cycle indicate that each input and output stage on the other hand is included in coupling groups of the switching network or each intermediate line. Thus, the couplers K 111 to KI10 and 20, in a known manner, lead to more than one coupling point. K 211 bis.Z210 with the intervening, not under the signal wire, a coupling group is shown in Fig. 3 as a through-shown coupler. The circuit also shows a holding wire. This contains it <with the couplers K 311, £ 310, KAIl, at the coupling points a holding coil (I) of the K410 , etc. Within each coupling group, all the coupling relays and couplers assigned to the coupling point with all couplers 35 are a relay's own Holding contact. In the intermediate of the other coupling stage over at least one 'line fields' each, there are windings of intermediate, possibly also several - i.e. in parallel of line relays Ll, L 211, L 3, each of which has the status of a single coupler to a single one of its intermediate line (whether free or occupied) - intermediate lines running through other couplers mark their "state of excitation (addressed or mutually connected. The intermediate lines expire). In the intermediate line field Z2 , one coupling stage to the other (KA, KB, KC, KD) through intermediate line fields Zl, Z2, Z3. Line relays connected to earth potential. These can also contain jumper distributors, on the continuing branch is the holding wire via which the intermediate line wiring in the individual contact L 211 of the intermediate line relay L 211 can be changed; however the classification 35 earth potential can still be switched on The holding wire is here in coupling groups. . so galvanically separated and only through the intermediate

The couplers of the second and third coupling stage line relay L 211 functionally connected,
are via intermediate lines in the intermediate line

feldiZ2 connected to each other in such a way that the coupling multiple characters, which here have the same meaning of all input coupling groups (first and second 40 as in the speech artery. The holding wire leads coupling stage KA, KB) to the couplers of all output input side via switching means in a counter coupling group (AKGl to AKGn in Fig. 1; third "pulse generator, via which, for example, the triggering of a coupling stage KC, KD) are connected. Binding can be brought about. Output side The number of input coupling groups and which each leads holding core via one each output, output coupling groups is similar with η reasonable 45 of each that is connected thereto outgoing type, but it may also be of different sizes line holding relays H, through which the output coupling groups contain forwarded individually in the third triggering a connection. who can connect ten couplers with six outputs each, if a single line has several to the fourth coupling stage and in this each six coupling outputs can be reached from the coupling network, is ler with ten inputs from the third coupling stage. 50 a holding relay H is assigned to each output.
Each coupler of the fourth coupling stage contains ten sub-brackets in FIG. 3 a contact

Outputs from the switching network, so that an output is shown. This contains the output coupling group in each coupling point sixty of these outputs with one rectifier GZ1, G12, G13, G14 in each case. These numbers are not essential to the series-connected response winding (II) of the coupling interpretation and are only used to describe the trip relay at this coupling point. The coupling relays are exemplary. Thus, for example on the basis of comparable in Fig. 3 only with A, B, C and D denotes, periodic theoretical considerations, the number of inputs, the rectifier Gzl, Gl 2, Gl Gl 3 4 have in

Transitions of a coupler of the fourth coupling stage greater than the coupling stages KA and KB are dialed through a different number than the number of its outputs, possibly in the same direction as in the coupling stages KC and KD . through the accessibility of the outputs of a coupling 60 This is of essential importance because this field can be increased. Measure enables the couplers of the coupling

The couplers are designed as relay couplers stages KA and KD or KB and KC constructively and each have a correspondingly identical structure in a known manner; for, first of all, the relays are built in their inputs and outputs; Each input line forms with 65, which also connects with the response windings All, BIl, each output line of the coupler a coupling CII, DII for the known purpose of the end point at which a coupling relay is connected, via the coupling of which the response circuits are connected in series. Contacts of the relevant input with the relevant rectifier include GrI, Gr 2, Gr 3, Gr 4 ;

9 10

Secondly, the couplers are usually connected with un- The path search vein of each intermediate line contains a normally closed contact for each equal number of inputs and outputs, eg. B. 11, of this intermediate equipped, the number of both inputs and line-associated intermediate line relays, e.g. B. also the outputs of a coupler of the first (or Ll, which identifies the state of the intermediate line (whether free second) coupling stage equal to the number of both the output 5 or occupied) in the path search vein of the intermediate passages as well as the inputs of a coupler of the line (Contact separated or quartered (or third) coupling stage should be closed). The route search arteries of intermediate lines

If the couplers of the first and fourth genes, which each point to one and the same coupler, are

or the second and third coupling stage constructively run in a coupler corresponding to this

With a uniform structure, the rectifiers io point the route search node (WKUl e.g. accordingly

consequently in the first two coupling stages other couplers KlU, furthermore WK211, WK 311,

Polarity on than in the third and fourth coupling WK411 together. Since the in a coupler, z. B.

step. Depending on this, the excitation has kill, merging intermediate lines in

the coupling relay in the first two coupling stages is not connected to this via switching means (e.g. holding winding

a different polarity than in the last two ends, pick-up windings) of so many coupling

pelstufen. This now requires lead in terms of the points, as through the product of the arriving

Contact point that a connecting and outgoing intermediate line to be switched is

If the address is correct at the point in the coupling matrix, the multiple characters are the other way around

is marked on which the coupling stages are drawn as in the holding wire and response wire;

opposite polarities of the excitation of the head 20 than ever an intermediate line leads to several

pel relay meet. This marking becomes, crosspoints of a coupler, whereas all

as described in more detail below, with intermediate lines leading to a coupler

Help of the intermediate line auxiliary relays, e.g. B. Lh, to which in a single, corresponding to this coupler-

respective contact point created. - The two types of path search node, z. B. WKlIl, together-

Lead polarities of the excitation of the coupling relays in the 25. ■

first two coupling stages on the one hand and the third in the intermediate line field Z 2 contains the path

and fourth coupling stage, on the other hand, require additional wires in addition to the break contact IZ 211 of the intermediate

Visible to the holding wire, in which the L211 intermediate line relays are

Holding coils of the coupling relays of a connection in relays individually assigned intermediate line auxiliary

Should be connected in series so that the holding windings 30 relays, e.g. LA. Since the route search network for

also in the first two coupling stages with a marking of a path to be switched through in the

the polarity of which are excited than in the last with coupling field is used, as later

the coupling stages. This requirement is met by being explained in more detail, the relay LH is used

the measure that the holding wire of an intermediate to this mark the Wegesuchader in

line taken from an output of a coupler of the 35 link field Z 2 and through

second coupling stage goes out, via the winding of the contact 21h to the response wire

Carry the link relay connected to earth potential.

is and that the holding wire of the same intermediate line, the path search wires lead on the input side via the one input of a coupler of a third a counting pulse generator Zig, a search selector SWl, coupling stage, via a working contact of the 40 a memory Sp and a search selector Sw 2 to the same Link relay also to earth potential corrector, from which it can be switched on by closing a contact. The holding wires are consequently a path search is initiated at clocks in that paths can be connected to negative potential at the other ends. search potential over which this counting pulse generator Zig you run, apart from a single intermediate corresponding input of the coupling network to the line field, over several coupling stages so that 45 path search network of the coupling network is led. That the holding windings several, z. B. two path search potential spreads from the input, to coupling relays in several, z. B. two couplings it is switched on by the corrector, via steps in series with a single holding current each - the path search cores of the intermediate lines are up to the circle of a connected connection. the route search node of the fourth coupling stage,

The response windings are known from 50 provided the corresponding intermediate lines between the reasons for decoupling the response circuits see all coupling stages are free, that is, the Zwibei marking a single response circuit are unexcited, so that their in provided, so that this marking is always on the path search cores Intermediate lines lying response circuit of a clearly defined break contacts are closed.
Through the switching path through the switching network KF be 55 The in the path search node, z. B. WK 411, remains restricted. converging path search arteries do not lead to

On the input side, the contact wire leads over all the individual outputs of the switching network, counting pulse generator Zig, the search selector SwI, but they are common, that is, for each route search node, memory Sp and the search selector Sw 2 in the order of the respective coupling group, in which for Through the connection 60 speaking setting set connected. That is why negative potential can be connected to them. The response also between the route search node WK 411 and ader leads on the output side to the setting set ES, which sees no multiple characters assigned to the setting set ES in front of the relevant output coupling group.

is. The contact line points at the crosspoints In addition, all route search lines of the

also the multiple signs. 65 lines of the intermediate line field Z 3 individually in

In Fig. 3, at the bottom a path search vein is that of the respective output coupling group, e.g.

of the route search network. The route search network is AKGl, corresponding setting set, e.g. ESl, ge

a structural image of the entire switching matrix. leads. As will be explained later, this is used

11 12

Measure for this, the route selection and route search potential if at its route search node

marking (connection via Lii relay) appears in the. The route search relays are so high '

entire coupling field with the help of the setting set ohmig that intermediate line auxiliary relay LH (cf.

perform. F i g. 3) cannot speak when looking for a route.

In the event that a path search test relay of a coupler responds between the same two 5, then couplers of two neighboring coupling stages say more that the outputs of the coupler run as an intermediate line, so that several can be reached, that is, that a connection in Be Intermediate lines run in parallel, which usually occurs in the event of a partial failure of the occupied counting pulse generator Zig via the construction of a switching matrix, the switching matrix and via an output of this a second route selection can be switched through among these respective io couplers. The selection of a single parallel intermediate lines with the help of the umpteen of several in a route search node to intermediate line relays L ... and the intermediate route search cores carried out by the relay line auxiliary relay LH. This second, Nl to NlO of the central marker ZM is the following path search will be explained further below in the description of FIG. 5 and 6 clearly explained. 15 purifies.

In Fi g. 4 are further details of a single one. In FIG. 5, further details of one per output coupling group AKG are shown. The coupling output coupling group provided setting set relais Cl to ClOO, of which only the first (cf. Fig. 2 in ES per AKG. ..) is shown,
and the last of a first and last row are shown to which ten outputs of each of the six couplers are (which also applies to the coupling relays C 801 to 20 of an output coupling group are ten outgoing C 900, Dl to D100 and D601 to D 700), put lines connected, the Prüf- undBelegungslen represent a first coupler of the coupling stage KC ; At the test points Ltg 1, Ltg2 the coupling relays C 801 to C 900 provide the last until LtglO are individually connected. The ten output couplers of the coupling stage KC of this output coupling of a coupler always correspond to one in lers. e.g. Ltgl, Ltg2 ... LtglO. Likewise, coupling stage KD in this output coupling group is also the series of ten test points Ltg 51, Ltg 52. Shown here are the response circuits of up to Ltg 60, which connect the coupling relay to the sixth coupler , and the windings correspond to the outgoing Lei windings C (II) and D (n) in FIG. 3 connected to this coupling group.

here also as in Fig. 2 and 3 the intermediate line For each coupler of the fourth switching stage, z. B.

field Z 3 shown. The designation also corresponds to X411, if a path test relay, e.g. WP1, is provided,

KC for the third coupling stage of the designation in its winding in FIG. 4 is shown and that too

FIG. 3. The fourth coupling stage KD has already been mentioned here in the description of FIG. Working

with parts of the setting set ES together, shown 35 contacts of a path test relay, z. B. WPl are on

so that the designation KDIES selected for this the test points, z. B. Ltgl to LtglO, the outputs

became. a coupler, e.g. B. the first coupler of this exterior

The coupling relays of a coupler are switched on via a two-way coupling group. So if 'Wegelenzuleitungen and column leads, with which search potential via the path search network of the coupling the response relay windings, e.g. Cl to ClOO, 4 ° field to the path search node of a coupler or the individually connected in series with them through so that its path search relay responds, so rectifier , e.g. B. Gel to GcIOO, are connected, this means that with regard to the condition individually excited in a known manner. The (free or busy) in Figure 4 all the parts of the switching matrix to this coupler is possible to hold the windings, not shown, the coupling relay switching through the space occupied Zählimpulsgeber and the signal circuits are well known in equal 45 Zig. Constructed in terms of coordinates by instructions. speak of the route search relay, e.g. B. WPl, one

Furthermore, in FIG. 4 a part of the path search node of the coupler, all of its outputs are used for the preliminary test

WK3U to WK310 and WK4U to JWf 410 with testing and line testing through the contacts, e.g. B.

the corresponding route search veins are shown. These lwpl to IOwpl, in preparation for preliminary test bridges

Route search nodes, in particular route search nodes 50 VB1 to VB 10, which are also subdivided

WK311 and WK 310, clearly show the previously required, such as. B. the preliminary test bridges VB2 and

Written summary of the route search veins FS10 in VB 2 α and VB 2 b or VB10a and

all intermediate lines that are connected to a coupler - VBlOb, if the corresponding to the test points

are switched on at one point. Lines belonging to different line bundles

From the corrector, it has the potential to search for a route over 55 ren. They can also be divided into two parts. In unite counting pulse generator Zig to one input of the different setting sets, e.g. B. created in the setting sets of the switching network , it arrives in accordance with ES1 and ESn , this subdivision is usually the one in Fi g. 2 also different for the route search network; however, for the purpose of a grouping from coupling level to coupling-fold representation, it is assumed that the sub-level spreads further to all those 60 positions of the preliminary test bridges in these two setting path search nodes, to which is the same via intermediate sentences.

Line relay break contacts closed intermediate The rectifiers GrI to Gr 60 are used in known

leirungen over all coupling stages and intermediate ways of decoupling. Each whole or under

lead fields. One marking relay corresponds to each of the pretest bridges divided into the route search nodes

WKAIl to WK416 of the fourth coupling stage - the same 65 Ml to MIO, through its contacts, e.g. B. ImI bis

also to all path search nodes in the 6 ml, the six corresponding to a preliminary test bridge

other output switches - is one checkpoint each, e.g. B. Ltgl to Ltg 51, to the six test

Route search test relay switched on, which responds, relays Pl to P6 after closing the contacts Ipk

up to 6pk of a test control relay PK can be connected. The test relays P1 to P 6 are mutually dependent in a known manner in a selection dependency by connecting their windings to a changeover switch contact chain formed from their own contacts IpI, 2 p 1 to Ip6, 2p6.

The setting set also has a connection relay An with contacts lan, 2 an until one . The setting set with its pre-test bridges VB1 to VB 10 can be connected via pre-test wheels % o vp 1 to vp m to the pre-test wheels of the same name in the central marker Zm via these connection contacts. For this purpose, the connection relay An can be energized by the central marker.

In Fig. 6 the central marker (Zm in FIG. 1) is shown in extracts. In the parts shown, it consists essentially of a number of target point relays, of which the two target point relays ZPl and ZP 2 are shown, and also of five preliminary test relays V1, V2 ... VS, of which the above are shown, and also one Rectifier matrix Gl to G 30 constructed in the form of coordinates, made up of four jumper wires RVl, RV2, RVi, RV4 and a check circuit Ph, which is used for the exact control of the testing of lines selected as free (checking of test lines with regard to triggering connections, if necessary via cables; protection against double connections) . The Zentralmarkierer receives from the corrector To the destination point information using the destination relay ZPL, ZP2, etc. a target point relay is provided for each destination point. Since there are usually several options (different routes, detours via different trunk groups) for reaching each destination point, the central marker, as will be described below, makes a selection from these options. The central marker is connected in parallel to all setting sets ES1 to ESn via a ring line RL.

To help you understand how the central marker works and what it means of its components, two cases of interconnection are combined below with the circuitry connections described, with the exception of the F i g. 6 referred to applies to all other figures and to the preceding parts of the description.

Initially, on the basis of FIG. 7 explains that, for example, the control centers B and C can be reached from a control center X via the following trunk groups and in the following order of priority of the selection of the trunk groups: The control center, in future referred to as destination 1, via the trunk groups Bd2, BdI, and the control center C. , in future referred to as target point 2, via the trunk group Bd3, BdI. Is a compound from the central X from a produce in their occupied Zählimpulsgeber Zig to the target point 1 and 2, it is accommodated in order from the center X corrector forth the target point or relay ZPL ZP 2 in Zentralmarkierer cm to respond. Furthermore, the contact cb (FIG. 6) of an occupancy relay (not shown) is closed in the central marker.

Now that the central marker has a target point information by z. B. the target point relay ZPl is connected, all trunk groups that come into question to reach this target point are to be checked to see whether they contain at least one free line that can be reached at the same time from the occupied counter Zig via the switching matrix .

The lines connected to the outputs of the couplers of the output coupling groups and combined in line bundles are * always connected to different couplers, namely the lines of a line bundle can only be connected to the couplers of a single output coupling group as well as to several different output coupling groups. It is now assumed that the lines of the trunk group BdI are only connected to outputs of couplers of the output coupling group AKGn and that the lines of the trunk groups Bd 2 and Bd3 are each connected to outputs of couplers of the two coupling groups AKGl and AKGn .

Since the trunk groups Bd2 and BdI come into question to control the target point ZPl, the two corresponding setting sets ES1 and ESn must then switch on the central marker. Apart from the individual wiring of the preliminary test wheels vpl to vpm with the preliminary test bridges FjB, these setting sets are constructed in the same way as shown in FIG. For the purpose of simplifying this description, it should also be assumed that the subdivision of the preliminary test bridges in the two setting sets, which is selected individually in each setting set, is carried out in the same way.

At this point, a few things must be said about the connection of the lines of the at hand F i g. 7 explained line bundle BdI, Bd2, Bd3 are inserted explanatory. It is assumed that the lines of the line bundle BdI are each connected in the output coupling group AKGn to the first outputs of all six couplers K4nl to K4n6 , that is to say the six test points Ltgl to LtgSl, d. h of the preliminary test bridge VB1 in the setting set ESn . The bundle Bd 1 thus comprises six lines. It is also assumed that the lines of the line bundle Bd2 are connected in the output coupling group AKG1 to the first outputs of all six couplers and to the second outputs of the first three couplers, which are connected to the nine test points Ltgl to LtgSl and Ltg2 to Ltg22, i.e. the preliminary test bridges FBl and VB 2 in the setting set ES1 correspond. The bundle Bd 2 thus comprises nine lines. It is also assumed that the lines of the line bundle Bd 3 are on the one hand in the output coupling group AKGl at the second outputs of the fourth, fifth and sixth couplers, which correspond to the test points Ltg 32, Ltg 42, Ltg 52, i.e. the preliminary test bridge FB2 & in the setting set ES1 , and on the other hand to the last (tenth) outputs of the first four couplers, which correspond to the test points LtglO to Ltg 40, ie the preliminary test bridge VBlOa in the setting set ES η . The line bundle Bd 3 thus comprises seven lines.

If the target point relay ZPl responds in the central marker, this initially means that the setting sets ESl and ESn of the output coupling groups AKGl and AKGn must switch on with their relays An via the ring line RL to the central marker. The mentioned relays An address via the contacts 16 zpl to 20zpl in the following circuits:

1. (Fig. 6) Earth, cb, 3vl, 3v2, ..., "3v5,

Glrl, 16zpl ....,., ". -, - -, ANl, (further Fig. 5 as

Glr2,17-zpl ESl) AN, An, -.

2. (Fig. 6) »Earth, c &, 3vl, 3v2, ..., 3v5, G / r5, 20 ^ 1, ANn, (further Fig. 5 as ESn) AN, An, -.

Both circuits refer to FIG. 6 and 5; the latter also represents the setting set ESl and ESn in order to be able to make this description easier.

The wiring RV1 thus defines which setting sets must be connected to the central marker at each of the different target points. This depends on the output coupling groups AKG1 to AKGn to which the lines suitable for controlling a target point are connected. The selection of a single one of the several initially switched on setting sets is described in more detail below.

The response of the target point relay ZPl also means that the lines of the line bundle Bd 2 and BdI come into question in this order of priority for establishing a connection. These bundles correspond to Vorprüfbrücken VBI and VB 2 in the adjustment set ESI and ES adjustment set η the Vorprüfbrücke VB1. A selection must now be made from the lines corresponding to these preliminary test bridges, which therefore each form a group within the line bundle per preliminary test bridge. This selection takes place in two steps. First, in a group test process, one of the pre-test bridges is selected by the central marker, of which at least one of the corresponding lines is free and at the same time accessible; It can be reached when, as described above, the coupler to which it is connected can be reached, that is, when the assigned contact, eg lwpl , is closed. To understand how the accessibility is determined by lines through the route search, is incorporated herein by simultaneously routing potential is connected across the with the corrector To occupied Zählimpulsgeber Zig to the respective input of the switching matrix KF with the delivery of the target location information and in that, as previously described , depending on the status (whether free or occupied) of all parts of the switching network routing test relay address, z. B. the path test relay WPl via the following circuit

3. - (corrector), ..., (Zig), (continue Fig. 3) TFXlIl, GlU, 11, WKHi, GlU, 1/211,

LH, WKZIl, Gw311 / 1, Z311 / 1, Gw411 / 1, (further Fig. 4) WK411, WPl, earth.

Other route test relays also respond, which also have route search potential. With their contacts, eg lwpl, the routing test relays now indicate whether the relevant lines can be reached.

When selecting the preliminary test bridges, the order of precedence that relates to the cable bundle must be observed. This test must therefore give preference to the preliminary test bridges VBl and VB 2 in the setting set ES1 over the preliminary test bridge VBlOa in the setting set ESn .

Since the second step of the test - the individual line test - can only ever refer to the lines corresponding to a single pre-test bridge, when selecting a pre-test bridge, a preferential order of precedence extending to all pre-test bridges is brought into effect, which applies to the specified pre-test bridges in the following order should extend: FSl, VB 2 α (both in setting set ESl), VBlOa (in setting set ESn).

It should be remembered that the subdivision of the preliminary test bridges, which is usually different in the various setting sets depending on the affiliation of the connected lines to different line bundles, is assumed to be the same in the setting sets ESl and ESn, so that in the description one only representation for the two setting sets ESl and ESn can be used. The wiring of the pre-test wheels vpl to vpm with the pre-test bridges is different in the two setting sets. In Fig. 5 shows the wiring in the two mentioned setting sets differently. The wirings in setting set ES1 are dash-dotted and those in setting set iJSTx are shown with dashed lines.

The preliminary test bridges VB1 and VB 2 a in the setting set ES1 are connected to the preliminary test wheels vp 2 and vp 1 (m-1) of the ring line RL via wirings drawn with dash-dotted lines. The pre-test bridge F51 in the setting set ESn is connected to the pre-test wire man of the ring line RL via wiring shown in dashed lines. The selection among the pre-test bridges is made with the pre-test relays Fl, F 2 to VS. These pre-test relays are high-resistance and can preferably be designed as electronic assemblies. They check whether at least one of the lines corresponding to a preliminary test bridge is free and accessible. Since only the Vorprüfrelais Fl, F 2 and V 5 are shown, these are used in the description for the selection. The windings of the preliminary test relays F1, F 2 to VS are each connected to one of the contacts 11 zpl, 12 zpl to lSzpllllzp2, 12zp2 to 15zp2 etc. of the target point relays. If the target point relay Izp is addressed, the pre-test relay Fl is connected via contact 11 zpl, the pre-test vp2 and contact 2 on in setting set £ "51 to the pre-test bridge FBl of setting set ES1 ; furthermore, the pre-test relay F2 is connected via contact 12zpl, the pretest wire vp (m— 1) and the contact (m— l) an in the setting set ESl with the pretest bridge FB 2 α of the setting set ESl ; furthermore, the pretest relay VS is connected via the contact 15zpl, the pretest wire vpm and the contact man in the setting set ESn connected to the preliminary test bridge FSl in the setting set ESn .

The preliminary test bridges are connected to the outputs of such couplers with test leads Lines connected via contacts of the routing test relays assigned to the couplers, to which a connection in the switching network from the assigned counting pulse generator is possible.

The preliminary test bridges therefore only lead to free potential from test lines that are free and at the same time are attainable. The mentioned pre-test relays respond, provided they are connected to the pre-test bridges of the setting sets at least one line is free and accessible at the same time.

17 18

It is now assumed that the test points Ltg2 in the setting set ESl and Ltgl and Ltg51 in the setting set ESn carry free potential, so that the pre-test relays V 2 and F 5 respond in the following branched circuit:

4th earth, cfr, 3vl, 3v2, ..., 3v5,

GIr 5, V 5.15 zp 1

Gr2, 2wpl, Ltg2, ..., -
vp (ml), (ot-1) an (ESI), VBIa

vpm, man (ES ή), VBl, j GrI, lwpl, Ltgl, ..., -

( Gr51, Iwp6, Ltg51, ..., -

The responsive pre-test relay separates circuit 1 at contact 3 ν 2 and forms the following holding circuit for its own winding:

r τ,,, * ■ **. *. V2,12zpl, vp (m-l), (m-l) an
5. Earth, cb, 3ν 1,2ν 2,>*> r \ »\ J

llzpl, AnI, QnESl) AN, An, - (in £ 51) VB2a, Gr2,2wpl, Ltg2, ..., -.

By disconnecting the contact 3v2, the ESn testing pre-test relay V5 is assigned to

Pretest relay VS de-energized, as well as the given connection relay An of the setting set ESn

if the other pre-test relays (not shown) are connected (cf. circuits 1 and 2).

see F 2 and F 5). Speaks when choosing between the preliminary test bridges

By responding to a pre-test relay, the pre-test relay F 2 is switched on, so first of all, a single pre-test bridge remains connected to the marker in one of the possible setting sets in which the selected pre-test bridge is located, i.e. the one selected at least with both a free 30 stellsatZUSl, since the circuit 5 as a holding current as well as an accessible outgoing line connected circuit for the relay An is only this one setting set. Since a pre-test bridge is only ever imagined to one. The response circuits to which the display setting set can belong, is furthermore two-switch relays of the other setting sets, that is to say in this case at least one of the possibly several setting sets that are connected again. This is separated after 35. As a result, the selection among the preliminary tests is described in more detail below: As shown in FIGS. 5 bridges different setting sets in their effect and 6 is recognizable, a selection was made among the setting sets themselves, the contact cb and all contacts of the relay ZPl after the selection of one of the preliminary test bridges ent response circuits 1 and 2 for the relays An - According to the order of preference according to which the forms, namely one approach is possible for each pre-test relay, which is involved in 40 line bundles for the control of a destination control of a destination point, is formed under the one selected speech circuit. This response current pre-test bridge corresponding outgoing control circuits 1 and 2 lead individually via the rectifier conditions to a freely accessible selected. For this purpose, one of the ten marker relays 2vl, 2v2 to 2v5 of the pre-test relay is connected in the GZrI to GZr 5 and at the same time individually via the working central marker. Every 45 switches. Corresponding to the wiring i? F2 the response circuit leads via its own working pre-test relay Fl to F 5, the response contacts 16zpl, llzpl to 20 zpl of the target point relay circuits corresponding to the connected circuits for the marking relays, referred to as marking-controlled target point for short, are wired RV3. Since the ZPl. This work contacts are rewirings response Vorprüfrelais F 2 due to the Fl still comparable in gen i? With ducts ANL to ANn 50 the target point relay ZfI expressed connected, each to each one of the setting sets the target point information, the second column of .ESI to ESn leads and in this with the connection test points Ltgl to Ltg52 corresponding pre-test relays, z. B. AnI, is connected (see. Circuits 1 bridge has been selected, is the marker line and2). The mentioned wiringsi? Fl can be connected to ground potential analogously to MZ3 via the contact Tzpl with the contactIv2 in the sequence of the selection of the pre-test bridges in 55. Carried out analogously to the columns in the Einstellsätzen, namely lead which 5 to Vorprüfrelais Fl of the Vorprüfrelais Fl, F 2 and F, F 2 to V are 5 allocated arrival tested Vorprüfbrücken, is that in Depending speech circuits to the relay A - Ability of the previously excited target point relay and the actuating sets, which also include the pre-test bridges tested by the pre-test relays and test relays. This 55 speaking of the marking relays Ml to MIO in is switched on particularly clearly on the basis of the description selected setting set. For this purpose, circuits 4 and 5 are used. The jumper wiring i? F3 is designed accordingly.

So are the contacts 16 zpl and Π zpl, which leads. The marking relay M2 of the setting

the pre-test bridges FBl and FB 2 α of the setting set ESl switched on via the following circuit:

set ESL checking pre- test relays Fl and F2 to- 65 ^ -cj- · «„ <»w_„ i uit a. * - »

j .L · j · * j Λ-1-it 1 · j τ- ·· i 11 ° · iirae, Iv2,7 zpl, MiZ, MZ, -.
are ordered, connected to the connection relay of the setting set ESl; Furthermore, the contact 20 is zpl, This marking relay M2 corresponds to a pre-test that the pre-test bridge VB1 of the setting set bridge or the pre-test bridges that are on top of each other

19 20

in a vertically drawn column of checkpoint FSl in the two setting sets ESl and ES η are th, ζ. B. Ltg2 to Ltg52 lie. not divided. As has already been described, the preliminary test bridge VB 2 α in the setting set ES1 has been selected from the test points in this marking relay via the contacts of the marking relay in question. The column of test points corresponding to the second column individually at 5 speaking pre-test bridge is switched on but divided into test relays P1 to P 6, provided that the test pre-test bridges VB 2 α and VB 2 b. Since there are lines in the pre-points that can be reached, the pre-test, i.e. the pre-test, is checked by the pre-test relay V2 . which are connected to couplers, eg K 411, whose bridging VB2α has been selected, the contact is an ordered path test relay, eg WPl, is energized. So Iv2 of the pre-test relay V2 via the contact 2zpl , for example, the test points Ltg2 to Ltg 52 through io of the target point relay ZD1 and via the jumper contacts Im2 to 6m2 of the marking relay M2 wiring RV 4 and the fourth switching point with the to the test relays Pl to P 6 switched on, provided that the rectifiers G 3, G 8 and G13 are connected and are closed via contacts 2 wpl to 2wp6 ; the. the first three test relays Pl, P 2 and P 3 effective test control relay PK in the setting set has already in-. be switched. Nevertheless, the contacts Im2. Bis between after the relay An has responded 15 to 6m2 of the marking relay previously addressed under certain circumstances, after all test relays P1 to Po to all test points Ltg 2bü 7. (Fig. 6) earth , cb, 3vl, 2v2, 17zpl, AnI, ^Lt S ⁵ } of this column will be} p: ° c \ Afj _{v / 7} „ρ v- I _n (L? _η ι _ only the three of the preliminary test bridge VB2α correspond-

IYD 1 ti. * J I ^ TLjtV. Λ till j JT JLi-, MUXJy . . . _? £ ä U 3-y . - ι τ · ',' · -ι 1 ·· τ »·· r

the outgoing lines emer selective examination

got excited. 20 (provided the relevant contacts

Are closed by the checkpoints Line 2 wpl to Cond 52 correspond 2, etc.).

The relevant lines are when selecting from the three effectively switched test relays Pl, pre-test bridges, but only those of the pre-test bridge P 2 and P 3 (P 2 and P 3 are not shown), the lines corresponding to VB2a in the setting set ES1 are energized with free and summarily selected via the paddock. Since the other lines that can be reached are interconnected, namely those of the preliminary test bridge VB 2b. It is assumed that the three named respective lines for a connection relay are energized and respond. Only the connection are out of the question, only the speech circuit of the test relay Pl is referred to below as the lines corresponding to the pre-test bridge FS 2 α:.
used for a selective line test. 30 "

To do this, the marker with the shunting connection 8. (Fig. 6) Earth, Iv2, 2zpl, (Sh 4), G 3, PAl,

wiring , RV 4 and with the test relay the setting (Fig. 5) PAl, Pl, lpk, Im2, 2wpl, Ltg2,

sets connected rectifier matrix provided, ..., -.

which consists of the rectifiers Gl to G30. _{Relay P1 Mdet over a} holding circuit

_PT ? F ^e , ^M i? "\ ^Wei t Ι" *, -. Ϊ́ · R ^a ° 8 ^ierv 5 ^ ^{rahtimg 35} its winding and its contact IpI to the minus,

RF4 has ten switching points ShI to 5A10. The first notential

Switching point SHl leads to the rectifiers Gl, P-

G6, GlI, G16, G21, G26 via a non-9. (Fig. 6) earth, Iv2, 2zpl, (ShA), G3, PAl,

broken column line of the matrix. The second (FIg-S) P ^ l ₅ Pl ₅ IpI ₅ -

Switching point Sh2 only leads to rectifiers G2 40

and G 7; then this column line is below and separates .am contact 2 p 1 the excitation current broken The third switching point Sh 3 leads over the circuit 7 of the relay PK , so that it drops; second part of the interrupted second column - furthermore, by opening the contact 2p 1, routing to the rectifiers G12, G17, G 22, G 27. prevents the other two test-outs of FIG. 6 from being connected to the other 45 relaisP2 and P3 also holding circuits form switching points ShA to ShIQ on the jumper wiring. The test control relay PK drops out, opens device RV4 to be taken from the rectifier matrix. its contacts lpk to 6pk and closes its con-over the ten switching points can of the six takt7p &. Of the test relays mentioned, only one of the test relays in the connected setting set remains energized in its holding circuit, with a certain number being effectively switched. So over 50, on the other hand, the others drop again, since they do not have the first switching point z. B. could form all six test relays via holding circuits. The contacts 2p 1, the second switching point, the test relays Pl and P 2, to 6p 1 thus represent a selection contact chain. Via the third switching point, the test relays P 3, P 4, and after the relay PK has dropped out, a P 5 and P 6 are simultaneously etc. effectively switchable. In the functional example previously described for checking the circuit by closing the contact, 55 lpk are formed for activation:

tion of the target point 1 which the preliminary test bridges VB1 _{Λ (Λ} / rr; "z- \ rr ^^ t>u" u / t?; ^ c \ t ^ z- i ~ i J \ Tm * · f " j. u ^ 7-.0 * jj -ei- ·· £ I ". (Rig. Ο) Erde, Jrh, pn, (rig. 5) 7ρκ, 3pl, and VB2 in the setting set ESl and the preliminary test in! 2w 1 r / o2 bridge FSl in the setting set ESn corresponding ab- xmA, AwpL, L.igi, ... _t .
outgoing lines available for selection. The component connected to the test terminal Line 2 on-line with the continuous among these three Vorprüfbrücken 60 line will be subjected to a verification unterauswählenden Vorprüfrelais Fl, F2 and VS are thus almost certainly a Paralleldie at the contacts IvI and IV5 the Vorprüf- test (Double compound ), Checking for a test relay Fl and F 5 lying contacts lzpl and line in a triggering connection (incorrect connection of the target point relay ZPl with the first switching connection) and the like can be avoided. Verification point connected via the jumper wiring RVA , 65 circuits are already known, e.g. B. by the German Auslegeschrift 1170 015 effective via the all six test relays Pl to P 6. If these are switched, because the pre-test bridges tested by the pre-test relays produce a positive result, in this case Fl and F 5 make the contact phl (in Fig. 3) in the central marker

21 22

Zm, via the earth potential in the output coupling - each individually between the couplers £ 111 and

group AKGl is created. As a result, the An K 211, further ZlIl and £ 210, further £ 311 and

Speech circuit for the coupling relays of all coupling £ 411 and also £ 310 and £ 411 are free,

levels switched on. To do this, however, there is one of these two ways (there can also be more free

Path selection instead of the 5 paths to choose from as described below) overlap in the

will not before the description of the response current switching matrix and only meet at the couplers

circles is continued. £ 111 and £ 411 together. This is due to the in

First of all, it should be remembered that the F i g. 2 grouping shown guaranteed. The one addressed test relay Pl a single selection of these ways is done on the coupler, more correct, namely the first coupler, z. B. £ 411, io to which the previously selected free reachable, from the output coupling group, for example AKGl, designated outgoing line is connected by being under the. Furthermore, through the one addressed marking relay M2 connected to this coupler £ 411 with its contact 1ot2, a very definite intermediate line of the intermediate line field-matched output from this coupler, to which that of the 23 a free line selected is connected, is connected - 15 leads. The connected to this coupler, the net. This free line on the basis of taking into intermediate lines in the intermediate line box Z 3 entsichtigung the result of the path search process speaking routing wires are in Fig. 4 ones shown, (vonWegesuchprüfrelais response, for example, WPL) in sets. They are grouped together with the selection of a preliminary test bridge on the route search relay TfPl. As already described, the fact that it is a question of this one coupling to the outgoing lines and the selection of a 20 ler £ 411 can also be ascertained from the only free ones via the response state of the test relay P1 that the coupling network can be reached. This accessibility to the contacts 4p 1 to 13ρ 1 of the route search wires extends to the entire coupler, to which this one free line selected with the route selection relay JV1 to N 10 in the central unit is connected. Connect markers Zm individually. These ways out

It may now be that between the incoming selection relay and the route search relay, the counting pulse generator Zig and the coupler WPl to WP 6 are initially high-resistance and load £ 411 several routes in the switching network can also not be connected to the route search cores. From are. Under the Anahme that the incoming loading the path selector relay talking after the Prüflegte Zählimpulsgeber Zig is addressed in the first switching stage relay Pl, those on which the KA (Fig. 2) is turned on at the coupler £ 111, 30 corresponding routing wires routing potential can e.g. B. find ways over the intermediate lines ZLl. It is assumed that the way out and ZL10 in the intermediate line field Z2 in Fig. 2 selection relays Nl and JVlO can be switched through via the following circuit, in that the intermediate lines respond:

11. (Fig. 4) Earth, whl, ^N1 ®> * «Π), 4pl, / 311/1, Gw311 / 1,

JVlO (I), JVlO (II), 13pl, / 310/1, Gw310 / l,
WK3U, (Fig. 3) WK311, LH, Hill, GlH, WKlIl, 11, Gill, WKlIl WK31Q, ... (corresponding to) ...

A connection is made via the contacts 3η 1 and 3η 10 (see FIG. 3). In the path search artery that the intermediate

Speech circuit 45 is assigned to line ZLl, the intermediate

... 3nl _ line auxiliary relay LJ? in Fig. 3 across the circuit

^1S ' ^re ' 3nlO '' 13. (Fig. 4) Earth, whl, InI, / Vl (II), 4pl,

..., _, ......, . _ ".... ₊ . / 311/1, Gw 311/1, WK311, (Fig. 3) WK311,

formed for the auxiliary route selection relay WH , the jjj ] J211 GL 12 FF £ 211/1 G / 11

responds and the circuit 11 of the route selection - 50 WKlIl (Zig) - ''

relay opens again with its contact wh 1 . '/ »···»

By a structurally secured contact sequence is on. The contact 2 lh of the relay LH earth ensures that before the contact whl opens, the potential closes via the contact phl to the response contact whl , whereby the chain of the reversers (Fig. 3) of the same intermediate line is switched on, switching contacts InI, 2nl, InI, InI to 10η2 an 55 Now let us first consider the case in which there is a direct connection between earth potential. The first on each coupler of the one and each coupler the spoken route selection relay, i.e. JVl, is the other coupling stage within each coupling group through with its low-resistance holding winding (II) and between each coupler of the second and each to the corresponding one, via contact 4 p 1 connected coupler of the third switching stage connected to each path search wire, while the other 60 only a single intermediate line exists. In this ren addressed route selection relay JV ... again case stands for the described switch-through route drop out. Due to the mentioned route selection - from the coupler £ 111 to the coupler £ 411 via the relay JVl, there is low-resistance earth potential at the coupler £ 211 and £ 311 only one intermediate path search wire via contact 4p 1 of the test relay line in each of the intermediate line fields Pl. This path search vein is live up to the 65 Zl, Zl and Z 3 available. By selecting the route search node WK 111 in the route search network via the intermediate line ZLl in the intermediate line field Z 2, the route search nodes WK211 and JF £ 311 and via the intermediate lines in the intermediate line ZL1 in the intermediate line field Z 2 to the two intermediate line fields Zl and Z 3.

clearly determined. Furthermore, through the intermediate lines and the specific input and the specific The output also marks the coupling relays which should be switched on to switch the connection through. are.

Thus, negative voltage potential reaches via the contact 14 p 1 in FIG. 4 to the response coils of the coupling relays D ... of the second column, not shown, of coupling relays, which would analogously correspond to the designations D 2, D12, D 22 to D 92. Since the connection must also take place via the coupler K311 of the coupling stage KC, consequently via the first intermediate line, only the coupling relay belonging to the first row of the second column of the coupler KAiI can be used for the connection.

By a similar coordinate condition is the K311 coupling relays Cl intended for the through-connection in the coupler. The coupling relay Cl and the coupling relay D 2 , not shown, are energized and they respond via the following circuit:

20th

14. (Fig. 4) -, 14 ρ 1, 7m2 (not shown, but analogous to 7ml and 7mlO; further see Fig. 3) GU, D (IL), GL3, C (II), 2lh, phl, earth .

^a 5 In the same way, certain coupling relays

in the coupling stages A and B are excited and respond. This also connects the path in the signal cores, e.g. speech cores. The coupling relays also form a corresponding holding circuit consisting of two branches across all coupling stages:

15 a) -, (Zig), A (I), a3, Ll, B (I), δ 3, L 211, earth;

15b) Earth, 2/211, C (I), c3, L3, D (I), d3, H, -.

35

This holding circuit, consisting of two branches ISa and 156, contains in each coupling stage the holding coil (I) of the coupling relay and a relay's own working contact connected in series with it. The holding circuit also contains the intermediate line relays Ll, L211 and L3 located in the intermediate line fields, which also respond and indicate the busy state of the intermediate lines by opening their normally closed contacts / 1 and 1 311/1 located in the path search wires. Furthermore, the holding circuit leads via the winding H of an auxiliary relay H which is assigned to the relevant output of the coupler of the fourth coupling stage and which also responds. A relay H is assigned to each output of each coupler. This is taken into account in FIG. 5 in that the contacts h ... of the auxiliary relays assigned to each output are numbered, as are the test points Ltg ... of the outgoing lines. The auxiliary relay H of the newly occupied outgoing line responds and closes its contact h 2 (in FIG. 5), whereby ground potential is connected as occupancy potential to the test line of the occupied line. The checking circuit Ph in the central marker is thereby put back into its idle state, whereby the central marker and the setting set return to their idle state in a manner not shown and described. By opening the contact lph of the verification circuit Ph , the circuit 14 is also de-energized; also wkd the intermediate line auxiliary relay LH in FIG. 3 dropped. As a result, the route search artery of the newly occupied intermediate line in the intermediate line field Z2 is also disconnected for the purpose of identifying the busy state at the contact 11h . Furthermore, the response circuit 14 is separated again so that the coupling relays addressed only remain energized in their holding circuit.

In the event that in the aforementioned line bundle BdI, i.e. among the two groups of lines that correspond to the preliminary test bridges VBl and VB 2 α in the setting set ESl , no line is free and accessible - so some can be free, but not reachable or reachable , but not be free - neither the pre-test relay Vl nor the pre-test relay V 2 responds during the group test process. If in the group of lines that correspond to the line bundle BdI and that are assigned to the preliminary test bridge VBl in the setting set ESn , at least one line, e.g. B. the lines corresponding to the test points Ltgl and Ltg 51 , free, so the relay VS is energized via a circuit 4 analog circuit in the central marker, so that it responds and is held in a circuit 5 analogous to the circuit. By opening contact 3v5 of relay VS , circuits 1 and 2 are separated; The relay An of the setting set ESn is held via a circuit analogous to the circuit 5, while the relays An of all other setting sets, here the setting set EsI, are thrown off again and cause the relevant setting sets to be triggered.

One of the free accessible lines of the line bundle BdI is selected in the manner already described. Since the lines of the cable bundle BdI are assigned to the first outputs of all couplers K4nl to K4n6 of the output coupling group AKGn, the relay Ml in the setting set ESn is energized via a circuit analogous to circuit 6, and all test relays Pl to P 6 are activated via a circuit 8 analog circuit effectively switched, which, in deviation from circuit 8, runs the contacts Iv5, Szpl, the switching point ShI and the rectifiers Gl, .G6 ... to G26. The test relay Pl responds and initiates the connection, as has already been explained in detail above.

In the event that destination 2 is to be approached as the destination, the switching processes are very similar. The target point relay ZP 2 responds and switches the preliminary test relays Vl, V 2 and V 5 to the preliminary test bridges FSlOa in the setting set ESn, VB 2 b in the setting set ESl (these two preliminary test bridges correspond to two groups of lines that together represent the line bundle Ed3 ) and to the preliminary test bridge FjBI in the setting set ES n, which corresponds to the cable bundle PdI. First, the relays operate on the two setting sets ESI and ESn, said lines are turned on in their associated output coupling groups AKGl and AKGn, as already described. Corresponding to the preliminary test relays Fl, F 2 and V 5 , lines of the groups of lines corresponding to the three mentioned preliminary test bridges are now available for switching through for selection in a group test process, provided that lines are free and accessible. If lines of the line bundle Bd3 in the group of lines corresponding to the preliminary test bridge VB 10 a of the setting set ESn are free and accessible, the preliminary test

Relay Vl in a circuit analogous to circuit 4 and forms a holding circuit analogous to circuit 5 via its own contact 2vl. Furthermore, a response circuit analogous to circuit 6 for relay MIO of setting set ESn is formed via contacts IvI and 6zpl. In addition, the test relays Pl to P 4 are activated via the contacts IvI and Izpl and the switching point Sh 6 and the rectifiers G 6, GU, G16, G21, which test lines (cf. circuits 8 and 9). The relay An of the setting set ESl drops out as a result of the opening of contact 3 vl. The group of lines corresponding to the preliminary test bridge VB10a in the setting set ES η is thus selected by the group test process.

However, is not in this group of lines, but in the Vorprüfbrücke VB 2 b of the Einstellsatzes ESI corresponding group of lines of the line bundle BdZ at least one line is free, so speaks the Vorprüf relay V 2 on, forms a holding circuit for the relay to the Einstellsatzes ESl and lets the relay An of the setting set ES η drop out. In the same way as described above, relay M 2 in setting set ESl responds , and test relays P 4, P 5 and P 6 of the same setting set are activated (contacts Iv2 and 7zpl for relay Ml; contactsIv2 and Izpl, switching point Sh S, Rectifiers G18, G 23, G 28 for the relays PA to P6 [see circuits 6, 8 and 9]). Thus, the group test process dio of the preliminary test bridge VB 2 bim. Adjustment set ESl corresponding group of lines selected.

If, on the other hand, at least one line is not in this group of lines, but in the group of lines of the line bundle BdI corresponding to the preliminary test bridge VB1 of the setting set ES η

ίο free, so the preliminary test relay VS responds, forms a holding circuit for the relay ^ «of the setting set ESn and lets the relays An of the setting set ESl drop out. In the same way as described above, the relay Ml in the setting set ESn responds , and the test relays Pl to P 6 are effectively switched (contacts Iv5 and 10zp2 for the relay Ml; contacts Iv5 and 5zp2, switching points ShI, rectifiers Eq, G 6, Eq , G16, G 21, G 26 for the relays Pl to P 6 [see circuits 6, 8 and 9]).

The described selection processes among groups of lines depending on destination information and depending on a target-point-dependent ranking order in which from the mentioned groups of lines into question existing line bundle for establishing a connection are summarized below in a table that provides an overview of the Should give selections.

FSl Target point 1 Destination information ■ Target point 2 FBl ESl ZPl ZP2 ESn Responsive destination relay Vl BdI, Bd2 VBlOa BdI, Bd3 V5 Eligible line
bunch Ml BdI, BdI ESn Bd3, BdI Ml Line bundle according to ranking
order ShI VBIa Vl VB 2 b ShI Preliminary test bridges, which groups
of lines of this line
bundle match Pl to P6 ESl FBl MIO ESl PlbisPö Affiliation of this preliminary test bridge
about setting sets Vl ESn Sh 6 V2 Testing pre-test relays M2 VS PlbisP4 Ml Responsive marking relays Sh 4 Ml ShS Effective switching point PlbisP3 ShI P4 to P6 Actively switched test relays
(partly not shown) Pl to P6

Subsequently, with regard to the route selection in the switching network, the case is considered that between two couplers of successive coupling stages, e.g. between couplers K 211 and K 311, furthermore couplers £ 210 and jOIO etc., more intermediate lines are provided than just a single one. So in the mentioned switching network between two couplers of adjacent switching stages z. B. four intermediate lines can be provided. In particular, intermediate lines in the switching network are arranged to run parallel in this way when such a switching network is already being operated in the stage of partial expansion. As a rule, this is temporarily always the case in any such switching system. So lead at a z. B.

only 50% partial expansion of the entire switching network, the outputs of each of the switching groups in the first two coupling stages to inputs of only half as many output coupling groups as in the final stage; there but nevertheless all outputs of the couplers of the second coupling stage in each coupling group via intermediate lines to be connected to inputs of the couplers of the third coupling stage must always two intermediate lines in each case run parallel in the manner described above in the intermediate line field Z 2 will.

The in F i g. The grouping shown in 2 is now also retained in the case of partial expansion, because it is for the The route search and route selection described is very advantageous. It would be conceivable if the

609 669/83

27 28

between two specific coupling groups in between - one pass through all four coupling stages -

's line appearance Z 2 lying intermediate lines of Ansprechstromkreis is fully "demonstrated d. L · deviating therefrom, the intermediate lines only be- with coupling relays A ', B', C 'with in series seen and D' corresponding to each other couplers, z. B. £ 211 switched rectifiers GZl ', GZ2', GZ3 ', GZ4'. M and 2 £ 311 as well as £ 210 and £ 310 are to be provided, but the illustrated contact wire of the intermediate line to the additional intermediate lines between these in the intermediate line field Zl is also a contact between the two coupling groups in the case of partial expansion, e.g. B. shown between 31 hl , which is described further below, the couplers £ 211 and £ 310 or £ 210 and under the completely through all coupling stages through £ 311, etc., to be arranged. A second response line is expressly excluded from this possibility, however, which is shown for io ader, which in the intermediate line field Zl one the route search and route selection through the group second, parallel to the first intermediate pier according to FIG. 2 given advantage is not assigned to initiation. The two respondents pay for it. If the principle of grouping belongs to two intermediate lines that are maintained in parallel according to FIG. B. XlIl, to a single coupler of the second choice are retained to the effect that in the coupling stage, for. B. £ 211. The same applies to route selection, as already described, on one for the four response wires of four interconnection couplers of the fourth coupling stage, e.g. £ 411, which are also parallel to the coupler of the ambiguous couplers of the second and third coupled coupling stage , e.g. B. £ 211, to be determined to a coupler stage via which the connection 20 third switching stage, z. B. £ 311. This is to be switched through. If, for example, four address wires are individually connected to four contacts31 h 3, on coupler £ 411 one to coupler £ 310 leading 31 h 4, 31h 5 and 31 h 6 , the line is selected to be discribed,
third coupling stage of this coupler is determined and in The response wires of the first two intermediate

the second coupling stage depending on the as lines lead from the intermediate line field coupler K310 and the coupler Kill, to which the Zl is connected to the same couplers in the coupling-occupied counting pulse generator, only the stages KA and KB, each to two different Coupler £ 210 suitable for switching through, i.e. different outputs and two different EM 'intended for this purpose. Only now are still in progress. For this reason, on each of the two response intermediate line fields of several, between 30 ″ in each of the two coupling stages, a multiple of the same coupler, for example K 211, K 311, is shown in parallel with multiple symbols. The structure of this coupler running intermediate lines to select a free one. and the connection of the intermediate lines to them is used. The circuit arrangement shown in FIG.
represents. 35 Furthermore, in FIG. 8 one through all coupling stages

It is assumed that the couplers JC111,. “Path search cores leading through are shown which are assigned to the coupling cores up to XI10 and £ 211 to £ 210 belonging to the same intermediate lines from each coupler of the first switching stage. The route search nodes WKlIl ', WK2ll ^r , two for each coupler of the second coupling stage. WK311 ' and WK411' correspond to the couplers. Intermediate lines run in parallel. In addition, it should be noted that 40 ZlIl, £ 211, £ 311 and £ 411 and compared with the fact that of each coupler the second coupling stage to each corresponding coupler (e.g. changed. In. In the link fields correspond to the couplers £ 211 and £ 311 or, however, the path search wheels per individual link coupler £ 210 and £ 310 are provided for each other) of the third coupling line. Since the intermediate lines pelstufe each four intermediate lines run in parallel. 45 run parallel to the same couplers, each intermediate line leads to and from the same route search node, as in the case of the individual arrangement described above (FIG. 3). Thus, in the intermediate connecting lines from a single output line fieldZl, there are two path search wheels between a 'coupler to a single input of the path search node WKlIl' and WK211 ' and in the coupler. In parallel, intermediate lines lead 50 intermediate line field Z 2 four path search wheels between different outputs of a single coupling see the path search nodes WK 211 'and WK311' to different inputs of a single one. These 'two' or four path search wheels coupler of the next coupling stage. can be recognized by the fact that they

In Fig. 8, similar to Fig. 3, of each gene of intermediate line auxiliary relay Lnl and Lh2 coupling stage KA to KD or of each intermediate 55 or Lh3, Lh4, LhS and Lh6 run.
line fieldZ1 to Z3 each have a coupling point (coupling relay, as already explained in FIG. 8) or one intermediate line or several intermediate lines running parallel to response circuits of the coupling relays are shown. The head and path search circuits are limited. The holding relay in the four coupling stages KA, KB, KC and circuits are not shown; they are also KD are based on the illustration in FIG. 3 with 60 as shown in FIG. 3. From this it can be seen for A ', B', C and D ' in a corresponding manner that each holding wire of each Zwinet. Likewise, the path search nodes corresponding to the couplers of the four interconnection lines are individually assigned to each of the couplers of the four interconnection relays, coupling stages in, for example, L1, L211, etc. Based on the representation in Fig. 3 with WK 111 ', these link relays are identified by WK211', WK31V and WKAiI ' . In 65 their response state, the busy state of FIG. 8, however, the representation is on response current intermediate line. The contacts Il 111/1 and 2Z111 / 1 circuits of the coupling relays and contacts are limited to path search circuits on the one hand and 1 Zlll / 2 on the other hand. / of two individual not shown in Fig. 8

Link relay of parallel link lines in link field Zl. The same applies for contacts 1/211/1 to 1/211/4 in intermediate line field Z 2.

Each intermediate line therefore basically corresponds to an intermediate line relay, for example Ll, and in the intermediate line field Z 2 also an intermediate line auxiliary relay Lh (FIG. 3). In addition (FIG. 8), an intermediate line auxiliary relay, for example LhI, LhI, is assigned to each intermediate line in the intermediate line fields Z1 and Z 3, provided that several intermediate lines run in parallel between the same coupler.

The path search wires of parallel intermediate lines run, as shown in FIG. 8, each over the winding of the associated intermediate line auxiliary relay LhI and Lh2 or Lh3 to Lh6, to two contact chains of changeover contacts of the intermediate line relays and intermediate line auxiliary relays. By means of these contact chains, a route selection is carried out among intermediate lines running in parallel between two couplers each, if the through-connection route in the switching network with regard to the coupler to be used has already been determined by the route selection carried out by the central marker with the aid of the relays Nl to NlO.

If a connection is now to be carried out via the couplers ZlIl, K 211, K 311 and K 411 and all intermediate lines are free, the intermediate line auxiliary relays LhI and Lh3 in the following circuit are energized after a route selection by the route selection relay Vl to NlO on the route search wires of a coupler:

16. (Fig. 4) Earth, wh2, 2nl, Nl (II), 4pl, / 311/1 (ie in Fig. 8/311/1 ', further Fig. 8) G / 13', WK 311 ', Lh3, 1/211/1, 2lh6, ..., 2lh3, G / 12 ', WK211', LhI, 1/111/1, 2lh2, 2IhI, GUI ', WKlIl', ..., -.

40

The relays L / z 1 and Lh 3 respond. With their contacts 3 IhI and 3 lh 3 they connect the terminals; Speech circuits for the coupling relays Ä, B ', C, D':

17. (Fig. 8) Earth, lph, 3lh3, B ' (II), G / 2' 3ZM, A'QI), GIl ', ..., -.

18. Earth, lph, 3 // 23, C (II), G / 3 ', D' (II), G / 4, ..., lph, -.

Likewise, when the relays LhI and Lh 3 responded, their changeover contacts llhl, 2lhl and 1 / Ä3, 2lh3 were actuated. These converted circuit 16 into the following circuit in which these intermediate line auxiliary relays are held:

50

19. (Fig. 4) Earth, w / i2, 2ral, Nl (II), 4pl, / 311 (ie in Fig. 8/311/1 ', further Fig. 8) G / 13', WK311 ', Lh3 , Ilh3, G / 12 ', WK211' ,, LhI, llhl, GUI ', WKUl', ..., -.

If the coupling relays respond, they form, as already shown in FIG. 3, the from. two branches existing common holding circuit (see. Circuit 15 a and 15 b), in which the intermediate line relays are located and respond. Accordingly, the changeover contacts 1/111/1 and 2/111/1 on the one hand and 1/211/1 and 2/211/1 on the other hand open their idle sides and close their working sides. Furthermore, this also speaks in FIG. 3 shown auxiliary relay H in the holding circuit, through which the setting set and the central marker are returned to their idle state in the manner already described, so that the circuit 19 is also disconnected again and the relays LhI and Lh3 drop out again.

If some of the parallel intermediate lines are already occupied when the connection is switched through, the associated intermediate line relays are also energized and their contacts actuated. If, for example, the contacts 1/11171, 2/111/1, 1/211/1, 2/211/1 are actuated, then after a route selection through the relays Nl to NlO, from which e.g. the relay Nl was energized and responds, the following circuit is formed:

20. (Fig. 4) Earth, wh2, 2nl, Nl (II), 4p 1, / 311 (ie in Fig. 8/311 / Γ, further Fig. 8) G / 13 ', WK311' , LhA, 1/211/2, 2/211/1, 2lh6, 2lh5, 2lh4, 2lh3, GlW, WK2W, Lh2, 1/111/2, 2/111/1, 2 // i2, 2lhl, GUI ' , WKlIl ', ... (Zig), -.

In this circuit, the relays 2 and Lh Lh 4 talk and bring about in accordance with the manner already described, the through-connection of the connection via the switching relay and the said circuit 20 in the intermediate line Lh auxiliary relay 4 corresponding intermediate lines.

Through the intermediate line auxiliary relays, e.g. B. LhI to L / 16, the criterion indicating the result of the way selection, namely the low-resistance through-connection of the through- connection path running via certain couplers through contacts 2 nl to 2η 10 in FIG the corresponding contacts, for example 31 h 3 to 31/16, marked; In this case, the intermediate line relays and intermediate line auxiliary relays make a selection from, if necessary, several free intermediate lines running in parallel. This marking with the aid of intermediate line auxiliary relays is therefore generally carried out in the second intermediate line field Z 2 (see FIG. 3). If, in addition to the marking, a selection from several parallel intermediate lines is required, this can be done in the intermediate line field with the aid of the intermediate line auxiliary relays, e.g. Lh 3, Lh4, Lh5, Lh 6. If, as FIG. 8 shows, this selection of parallel intermediate lines is also required in other intermediate line fields, eg Zl, then this can be done with the aid of intermediate line auxiliary relays to be provided specifically for this purpose, e.g. B. Lh 1, Lh2 can be made.

It can now be assumed with certainty that the switching groups comprising the first and second switching stage KA, KB or third and fourth switching stage are always designed for the final stage of expansion of a switching system and that the stage of partial expansion of the switching system by a correspondingly smaller number of these Coupling groups is taken into account. This means that no parallel intermediate lines have to be provided within these coupling groups. Parallel running

Intermediate lines are therefore generally only to be provided in intermediate line field Z 2, if applicable. In any case, this link field is outside of each link for marking purposes One intermediate line auxiliary relay is also provided for each intermediate line relay. In an advantageous manner These intermediate line auxiliary relays can also be used to select the route under, in addition to marking purposes parallel intermediate lines are used.

IO

Claims (17)

Patent claims: 1.Circuit arrangement for telecommunications switching systems, in particular telephone switching systems with multi-stage switching matrices, in which the outputs of couplers of a last switching stage connected to lines (e.g. local and long-distance lines) can be reached from the entrances via different routes that can be selected alternatively by means of a route search, and with bundles of lines which combine the lines, in particular depending on the direction, and of which those suitable for reaching a specific destination are available for selection in an order of priority depending on this for the purpose of occupying a free line, characterized in that a specific input (Zig) is connected to each Connected path search potential, in particular, spreading in a fan-like manner, all couplers (K411 to K4n (S) of the last coupling stage (KD) that can be reached via free intermediate lines) mark that, furthermore, among the lines that are used on the one hand to reach the respectively selected destination (e.g. destination point 1) belong to suitable respective cable bundles (BdI, BdI) and on the other hand to couplers marked by path search potential (e.g. B. K 411), a free line is selected from that of the aforementioned line bundle, which is the first in terms of the order of precedence determined by the destination (destination 1) (Bd2 before BdI) in which at least one free line (e.g. the corresponding to the test point Ltgl ) is available that the coupler (IC 411) of the last coupling stage (KD) is determined by the line selected in this way, via which the connection is to be switched through, and that after a single path has been selected from the specific input to this coupler a corresponding connection is switched through from the specific input via the last-mentioned coupler to the selected line. 2. Circuit arrangement according to claim 1, characterized in that per coupler (z. B. £ 411) of the last coupling stage (KD) Wegesuchsc'haltmittel (z. B. WPl) are provided which a line test for each connected to the same coupler Initiate lines. 3. Circuit arrangement according to claim 2, characterized in that contacts (e.g. lwpl, 2wpl ..., lOwpl) of the path search switching means ( e.g. WPl) in the test circuits of those outgoing lines (corresponding to Ltgl, Ltg2, ..., Ltg 10) that are connected to the coupler (e.g. £ 411) to which this route search switch (WPl) is individually assigned. 4. Circuit arrangement according to claim 3, characterized in that the line test consists firstly of a group test process and secondly of a single line test, that through the group test process from several groups (eg according to Ltgl to Ltg Sl, Ltg2, ... etc.) of several Lines a group (e.g. corresponding to line 1 to line 51) is selected which contains at least one free accessible line ( e.g. corresponding to Ltgl) , and that a free accessible line within the selected group ( e.g. according to Ltgl) is selected through the individual line test. is selected. 5. Circuit arrangement nadh claim 4, characterized in that each line bundle (eg Bd2) consists of one or more groups of lines (eg according to Ltgl to Ltg51, Ltg2, .... Etc.). 6. Circuit arrangement according to claim 5, characterized in that according to the same order of precedence, in which the bundle of lines (e.g. Bd2, BdI) for the control of a respective destination ( e.g. corresponding to relay ZpI) come into question, by the group checking process of the groups ( For example, according to Ltgl to LtgSl) a single line is selected in both ES1 and ESn depending on its affiliation to one of the line bundles, which contains at least one free accessible line. 7. Circuit arrangement according to claim 5, characterized in that of the lines of a group (e.g. corresponding to Ltgl to Ltg 51) in each case at most one (e.g. corresponding to Ltgl) is connected to the output of a coupler (e.g. K 411) is. 8. Circuit arrangement according to claim 7, characterized in that the lines (for example corresponding to Ltgl to Ltg 51) of a group in all relevant couplers (e.g. K 411 to K 416) at the same (e.g. first) output the coupler (e.g. £ 411 to £ 416) are connected. 9. Circuit arrangement according to claim 7, characterized in that the coupler (eg £ 41i) via which a required connection is to be switched through is determined by a single line test (e.g. test for Ltg2). 10. Circuit arrangement according to claim 1, characterized in that the couplers (e.g. '.Oll to £ 310 and £ 411 to £ 410) a penultimate and last coupling stage (e.g. KC and KD) in a known manner in output coupling groups (e.g. AKGl) are combined and that the output coupling groups (e.g. AKG1) are individually assigned a setting set ( e.g. ES1) . 11. Circuit arrangement according to claims 5 and 10, characterized in that each Group of lines to the outputs of the couplers each in a single output coupling group is turned on. 12. Circuit arrangement according to claim 10, characterized in that the different groups (for example those of the preliminary test bridges VBlOa in EinsteUsatziJSn and VB 2 b in the setting set ESl corresponding groups) of lines in each case of a line bundle (eg Bd3) group are connected pen by pen to the outputs of couplers ( e.g. K4nt, K 411) of different output coupling groups (e.g. AKGn, AKGl) . 13. Circuit arrangement according to claims 6 and 12, characterized in that the group checking process relates to the groups of lines of different output coupling groups (eg AKGl, AKGn) and that for this purpose several setting sets (eg ESl, ESn) are connected simultaneously in parallel to a common marker . 14. Circuit arrangement according to claim 13, characterized in that the selection of one Group that marks this comprehensive output coupling group with its assigned setting set and switches off the other output coupling groups and setting sets. 15. Circuit arrangement according to claims 8 and 11, characterized in that in all couplers (e.g. K 411, ..., K 416) an ao output coupling group (e.g. AKGl) to each because the same (eg second) outputs (eg Ltgl to Ltg 52) of the coupler, the lines of several groups (eg corresponding to VB 2 α and VB 2 b in ES1) are connected. 16. Circuit arrangement according to claims 9 and 11, characterized in that a chain of test switching means (F1 to P 6) which is dependent on each other and which enables a simultaneous test of all lines of a largest possible group of outputs (e.g. according to FBI in ESl) . 17. Circuit arrangement according to claims 15 and 16, characterized in that when a single one of the several groups of outputs is selected ( e.g. corresponding to VB2a in £ 51) that part (the first three) of the test switching means arranged in a chain (Pl, ... ) which corresponds to the outputs to be tested on the lines of the selected group. For this purpose 2 sheets of drawings 609 669/83 9.66 © Bundesdruckerei Berlin