DE1138118B - Circuit arrangement for the transmission of several labels via a signal wire in telecommunications switching systems with couplers, e.g. B. in telecommunications private branch exchanges - Google Patents

Description

In telecommunications switching systems with couplers instead of voters, one is for economic reasons endeavors to keep the number of coupling wires in the connection path as small as possible. To transfer the identification required for the operation of the system is in the extreme case only a single signal wire to disposal. There are different ways of having multiple labels on one line transferred to; however, their applicability decreases as the number of labels increases.

The invention relates to a circuit arrangement for the transmission of several identifiers via one single signal wire in telecommunications switching systems with couplers, z. B. in telephone exchange systems, for the purpose of identifying the various operating states of a call station on the signal wire connected connection path. In such switching systems are the necessary characteristics sometimes particularly numerous. The choice of a suitable transmission method is accordingly more difficult. The following operating states are, for example, after a connection path has been switched through of the connected subscriber: subscriber free or busy, subscriber staffed internally or externally. In addition, there are signals for the determination of a participant and others to submit for billing.

In the circuit arrangement according to the invention, this object is achieved in that the identification by applying different potentials to the signal wire and the different operating states be checked by comparing these potentials with potentials deviating from them and that further characteristics in the form of the respective potential are superimposed on the signal wire Pulses are transmitted.

It is known to use either potential levels or pulses for multiple use of lines for example to use different lengths. By applying these measures together However, with a suitable choice and assignment of the labels, solutions can be found with little effort achieve with previously unattained simplicity in terms of circuitry.

A circuit arrangement for telephone private branch exchanges is also known, in which the wire used for the transmission of authorization codes is also used for the transmission of counting pulses. The authorization identifiers are transmitted in a time sequence determined by a clock circuit. Instead of the authorization identification circuit arrangement
for the transmission of several license plates
via a signal wire in telecommunications switching systems with couplers,
z. B. in telecommunications private branch exchanges

Applicant:
Albiswerk Zürich AG, Zurich (Switzerland)

Representative: Dr. M. Owl

and Dipl.-Chem. Dr. rer. nat. W. J. Berg,

Patent Attorneys, Munich 13, Kurfürstenplatz 2

Claimed priority:
Switzerland of July 15, 1960 (No. 8124)

Günther Weisigk, Zurich (Switzerland),
has been named as the inventor

Characters can be transmitted counting pulses by applying an auxiliary voltage to the specified wire. A permanent transmission of identification is not possible in this way, i. i.e., for the transfer memory is required for several tags, but these require more effort. In contrast in addition to the multiple transmission according to the invention by different Potentials determined characteristics at the same time further characteristics in the form of impulses, which the Potentials are superimposed, are transmitted.

With reference to the drawing, for example, embodiments of the subject matter are shown in more detail explained.

Fig. 1 shows the circuit arrangement of a private branch exchange with extensive marking, in

FIGS. 2 and 3 show details of the circuit arrangement of two modified embodiments.

The subscriber circuit rS assigned to each extension has access to a house connection set HVS via an input coupler EK and to an exchange connection set A VS via an exchange coupler AK . A line coupler LK takes over the connection to the desired participant. The couplers mentioned are not shown in the drawing.

209 677/81

3 4

posed because the type and structure of the coupling matrix for winding Wl of the pulse transformer IT, which the invention are insignificant. The core speech paths from one state of saturation to the other (a-, b-Adem) are also only hinted at. Transferred to.

The winding W 1 is used for reverse magnetization

Central marker ZM. In addition, FIG. 5 shows the core of the pulse transformer IT. It is indicated in the th circuit arrangement still 'the place circuit PS belonging to the switching response of one of the control relays QA (A VS), Q 1 station and a register or β 2 (HVS) via a contact qa, q \ or q 2 RG . of the relevant relay, the closed contact

The central marker ZM marks on request , ml or mrl of the energized switch relay, tion a free connection set and causes the io a resistor R 5 and a rectifier G 2 to connect a certain participant to the supply voltage.

marked connection set via a coupler. At the third winding W 3 of the pulse transformer

the connection to the tors / Γ, which is not described in more detail, is via a rectifier G 3 and via central marker ZM , in the occupied connection, a further contact ma3, m3 or mr3, the connection set, a connection relay (not shown), 15 connection relays, the occupancy relays CA (AVS ), Cl that initiates the free examination. Connected in the trunk connection and Cl (HVS). When the response set, 4FS, a contact times the relevant one of the control relays QA, Ql or Ql triggered connection relay closes the test circuit. The house connection reverse magnetization of the core of the impulse transforming charge set contains two tors / Γ generates a pulse in the winding W 3, the connection relay, one of which with a contact clock the associated occupancy relay to respond via the input coupler EK leased. Because of the rectifier G3, the test circuit at fenden and the other contact mrl which occurs with one of the previous magnetization reversals, the pulse via the line coupler LK ver, does not come into effect. Under certain circumstances, the current test circuit closes. The switching through to the winding W 3 of the pulse transformer of a connection set is controlled by a 25 and the occupancy relay to the winding is another relay that responds via the d-wire. Connect this Wl. The occupancy relays have a control relay or the first designated in the Official junctor AVS with, not shown in the drawing, the hold circuit, QA and in-house connection set HVS with Q1 on triggering of the respective connecting Q. 2 is reopened. With the reverse magnetization

The occupancy of the switched-through division occurs in the winding Wl, likewise a pulse pick-up is characterized by the potential prevailing on the c-wire, which causes the isolating relay T to respond. With a supply voltage in the following circuit:

for example 48 V is on the c-wire in the open , _{Q Λ / ηΛ} ~ _{rT ηχ / Λ} -, _ηΛ ^ ₁ _ _{Δ / 1} __ η,

,,,. £. .., -ο Λο-ίτ ο cj τ. · Ι - 48 V, Or 13, Il (Wl), CrI, ml, c-wire, L,

if there is a potential of ζ. B. -48 V. If the part- -48 V

If the recipient is busy, the potential on the c-core is 35

on the other hand, for example -33 or -24 V, depending on the

whether the subscriber is busy internally or externally. magnetization of the core of the pulse transformer

The relevant potentials are achieved by dividing the IT. As a result, there can be no reverse magnetization

Supply voltage generated. In the event of an internal event, and the relevant occupancy relay remains

bond forms a resistor R 1 or R 2 in the house 40 de-energized.

HVS connection set, in the event of an external

binding a resistor Ra in the exchange connection set circuit for subscribers who are authorized to intrude

AVS together with the resistance of the separator takes effect when the called subscriber is busy

relay T in the subscriber circuit TS is the one for this. In this case, the calling party can

provided voltage divider. 45 after dialing the number once, wait until the

The test circuit for the free test is when the participant is called free. In the drawing is

Central marker ZM arranged and contains an Im- such a review circuit only for the

pulse transformer IT, which is shown on a core from Mate house connection set HVS . It contains a

rial with a rectangular hysteresis loop, three verification relays NE, to which a transistor TsI is

Windings Wl, W 2 and W2> carries. The winding WI is turned 50 and is aul on the contacts and au!

lies in the test circuit, the one from point Pl via the one that may respond when busy

Winding Wl, the rectifier Gl, the contact Aufschaltelais (not shown) switched on. At the

times in the office connection set AVS or one of the points Pl there is the same potential (-37 V) as

Contacts ml and mrl in the HVS house connection set, at point Pl of the test circuit in the central marker

the c-wire and the isolating relay T or Tl to the 55 ZM. This potential is with the voltage divider

The negative pole (-48 V) of the supply voltage source generates R 6, R 7. In freefall it flows in from point P1

runs. At point Pl there is a potential of z. B. Current through the base resistor R 8, the DC

- 37V, the through the voltage divider R 3, RA reporterG4 and the resistor R 9 to the c-wire, the

is true. in this case the potential is -48 V. The on

In the test circuit, because of the rectifier 60, the base resistance R 8 can lead to a drop in voltage

Gl current only flows when the potential at the point transistor TsI changes to the conductive state, where-

Pl is more positive than the one on the c-core. This through the check relay located in the collector circuit

only applies when the participant is free. This speaks to NE .

with the potential at the c-wire is -48 V. In order to determine the number of a connected

If the participant is busy, the potential at point P1 (-37 V) is contained in the central marker ZM

against more negative than the one on the c-wire (-33 a number of relays, namely with a decadic

or -24 V). With free potential on the c-core, the system flows ten relays per decade. They are with one

with the test circuit switched on, a current over the connection capacity of, for example, 10,000 partial

5 6

take a total of 40 relays. At point P 3 there is a potential of -29 V, the decade is assigned a number between 0 and 9. is formed at the voltage divider R 16, R 17. Provided that each participant is via his participant circuit, the potential on the c-wire is more negative than -29 V, TS with the relay corresponding to his number, which only applies if the busy participant is connected. The drawing shows only one relay El, 5 house calls (-33 V), flows from point P3 Zl, Hl or Γ1 per decade. For locking a current through the base resistor R 18, the direct coupling of the relay circuits serving richterG12 rectifier, the resistor R 19, the contacts fei GS, G6 and Gl. and on to the c-core. The resistor R at the base 18 from the subscriber-identification can falling from the register 2 performs voltage transistor Ts in the RG, or the place of circuit PS causes io conducting state, whereby the relay in HG be. If necessary, a collector circuit of the transistor Ts 2 responds in the register RG. The relay (not shown) with the contact ir and in relay HG holds itself through its own contact hg, the space circuit PS a relay (not shown) the resistor R 20 and the contact bs 3 with the contacts ip 1 and ip 2 .

The identification relays El, Zl, Hl and Tl are 15 outgoing connection excited by pulses that are superimposed on the respective potential on the c-wire. When lifting the handset on one of these impulses, a capacitor C (ZM) is used, the central marker ZM is assigned to the extension, via a resistor R 10 to the supply voltage which is then charged in a manner not described in detail and when the contact ip is closed 1 in 20 determines the number of the subscriber concerned ( let identification of the other place circuit PS via a resistor R 11). The central marker ZM mar- or when the contact ir in the register RG kiert a free house connection set HVS and is discharged via a resistor R 12. In series causes the through-connection of the identified Teilzum capacitor C, the primary winding Wl is transferee to the marked house connection set HSV Ue of a pulse, the loading and unloading 25 via the input coupler EK. When connected, it transmits charging pulses into the signal circuit. The connected to the central marker ZM speaks in the occupied one end of the secondary winding W 2 of the impulse house connection set HVS to the switch relay, tragers Ue is via a rectifier G8 to which the contacts mi, m2 and m3 closes. Contact -48 V. From the other end of the secondary winding ml on the test circuit in Zentralmarkierer W 2 of the signal circuit performs either the 30 ZM to the c-wire, whereby the free test initiated square circuit PS (contact ip 2) and is reasonable in. In freefall, the core of the impulse transformer, the closed contact at the mators / T, is remagnetized. The isolating relay Γ in the exchange connection set A VS or via the closed subscriber circuit TS does not yet need to address NEN contact mr4 of the relevant connection relay. Via the connected rf-wire house connection set HVS to the c-wire, on which the 35 speaks to the control relay Ql , which is connected to its identification relay El, Zl, Hl and Π-contact ql the reverse magnetization circuit. switches. During the reverse magnetization, voltage pulses occur on the windings Wl and W 3 during the capacitor discharge, which cause the secondary winding W 2 of the pulse transformer, on the one hand, that the separating pulse in the positive direction of, for example, 96 V, so that 40 relays T and on the other hand via the contact m 3 which responds briefly to the potential at the c-wire to +48 V- occupancy relay C1. The occupancy relay rises. C1 lasts until the house connection is triggered. Each subscriber circuit TS is a charge rate HVS. The holding circuit for the separating counter Z is assigned, which runs with one end of its relay T via the c-wire, the closed winding via a rectifier G9 and a 45 contact el of the occupancy relay C1 and the resistance R 13 also connected to the c-wire - stood R 1. There is now a potential sen is on the c-core. The incoming charge impulses of - 33 V from the office, which cause the subscriber to be internally occupied, that the contacts gml, gm2 and gm3 are identified and blocked against further assignment. Exchange connection set AVS closed in pulses As soon as the control relay Ql has responded,. Contact gml places over the rectifier 50, the central marker ZM is in no closer detail-GlO ground potential to the c-wire. The contacts gm 2 triggered in a delayed manner. As a result and gm 3 switch the voltage divider R 14, R 15 closes the switch-on relay, and the contacts open together and place the m 2 and m 3 formed by the same.

Potential of -20 V to the other winding side After the response of the occupancy relay Cl of the counter Z. On the very short identification 55 the house connection set HVS is connected to the register impulse due to its inertia RG , whereupon the subscriber with the does not respond . The rectifier G11 prevents that you can start dialing the number. Occurrence of identification pulses on the c-wire “the potential on this side of the meter Z ^{can exceed the earth- a)} house connection potential. 60 At the end of the dialing of the number, the register requests the RG central marker ZM for incoming public calls, which is busy due to the called extension, the operator can determine whether the subscriber is internal or the house call record is stored in the RG register HVS is manned via the external line. For this purpose, the space coupler LK to the desired subscriber through-connection PS contains a test circuit that switches via the im 65. In the house connection set HVS occupied case, closed contacts fei, fe2 and fe3 respond to the connection relay, which switches on the contacts mrl, mr2. This test circuit has a mr 3 and mr 4 closes. The free test then finds relay HG, which is preceded by a transistor Ts 2 . in the manner already indicated above.

above-described manner recorded by the counter Z in the subscriber circuit TS .

In order to determine which extension is or was connected to the exchange connection set AVS , the operator can initiate the subscriber identification from the place switch PS by closing the contacts ipl and ip2. In certain cases, the end of the call is signaled to the place switch and, in connection with this, the subscriber identification is automatically initiated as soon as the operator connects to the exchange set with the place switch.

The subscriber identification can easily be carried out even after the call has ended, without blocking the subscriber who made the external call. When the handset is placed on the extension, only the occupancy relay CA and the isolating relay T are made to drop out, while the exchange coupler AK via di id dAd lid Hl

which has to ensure that only a single connection set can be switched through to the subscriber that has become free. The relevant supply relay (eg C 2) and the relevant isolating relay (eg TT) must in this case be excited by the aforementioned central device, for which purpose a test circuit corresponding to that in the central marker ZM can be used.

35

In this case, the test circuit runs via the contacts mrl and aul. If the called subscriber is free, the occupancy relay C 2 responds after the control relay Q 2 , and the isolating relay Tl in the subscriber circuit TSl of the desired subscriber remains on the closed contact c 2 of the occupancy relay Cl and the resistor

stood R 2.
If the desired subscriber is busy, can

the occupancy relay C 2 does not respond. If the calling subscriber is authorized to switch on, after the central marker ZM has been triggered, when the switch relay drops, the switch relay in the HVS house connection set switches on the verification circuit NE with its contacts awl and au2. As soon as the desired participant becomes free, the review circuit causes the completion of the from in a manner not described in detail

calling subscriber awaited connection. pp

In this case, the verification relay NE requests the holding coils of the coupling located in the d-Adex to a central device (not shown), the relay is still held and the connected through

Maintains connection. In this way, the subsequent transmission of charge pulses is also possible enables.

Incoming office connection

To switch an exchange connection, the operator switches to an exchange connection set A VS with the place switch PS , whereupon the

,. 30 Ahlli i i Ad

ti) Official Association

After dialing a code, e.g. B. 0, the register RG switches to the central marker ZM. In the HVS house connection set, the connection relay responds with the contacts mrl to mr4 . The register RG initiates the identification of the calling subscriber by closing the contact ir. On the basis of the identification, the central marker ZM can set up a new connection between the identified subscriber and a free exchange connection set A VS. After the new connection has been switched through via the exchange coupler AK , the central marker ZM initiates the release of the old connection. Here, the connection is in the house connection kit HVS briefly interrupted, whereby all relays fall of the house connection set HVS and thus the connection via the input coupler EK is triggered.

In the exchange connection record AVS the call 50 is again discussed. At the same time, the operator can switch relays with the contacts mal, ma2 and ma3 lh id

with which the free examination is initiated. In the same way as in the case of the HVS house connection set, the control relay QA, the occupancy relay CA and the isolating relay T respond one after the other, provided the calling subscriber is free, which is normally the case. The isolating relay T , however, does not need to drop out during the switchover of the connection to the exchange connection set. The potential on the c-wire now assumes the value - 24 V and identifies the subscriber as busy. As soon as the control relay QA has responded, the central marker ZM is triggered with a delay, and the Anschalteli d A

35

40

g ,

The connection relay in this exchange connection set responds. The operator now sets the number of the requested extension. The selection digits are stored in a register assigned to the location circuit PS. This register requests the central marker ZM , which is now able to establish the connection between the occupied exchange connection set AVS and the desired subscriber. The connection relay in the exchange connection set ^ FS responds. If the subscriber is free, the occupancy relay CA can also respond after the control relay QA has picked up. If, however, the subscriber is busy, the occupancy relay CA cannot respond. In this case, the switch relay (not shown) in the exchange connection set A VS responds, whereby the contacts bsi, bs2 and bs3 are closed in the place circuit. The central marker ZM is triggered with a delay after the control relay QA has picked up , and the switch relay in the exchange connection set AVS drops

55

60

g g

The trunk connection set relay drops out. Of the participants then receives the dialing signal from the office. The with an outgoing office connection during of the call or after the end of the call from the office incoming charge impulses will continue in the

65

determine whether the desired subscriber is busy internally or externally. As described above, the relay HG only responds when the subscriber is internally occupied. The response of the relay HG is signaled to the operator. The activation or the activation signal can also be dependent on the state of excitation of the relay HG.

The circuit arrangement described allows various modifications, some of which are given below are explained in more detail. Although pulses are used for subscriber identification, whose duration is only a fraction of the minimum duration of the charge impulses and whose potential is that which exceeds the charge impulses, special switching devices may be required, which prevent the meter from responding to the identification pulses. To this end

the rectifier Gil is in the embodiment according to Fig. 1 provided that the voltage which can occur as a result of the identification pulses at the counter Z defines, together with the resistor R 13.

Further possible solutions for the aforementioned purpose are shown in FIGS.

According to FIG. 2, the counter Z has, in addition to the response winding I another winding II, which causes a counter-excitation during the identification UTsacM. One end of both windings is connected to the c-wire. The other end of the Response winding I is through a rectifier G14 with a potential of - 20 V and the other The end of the counter winding II is connected to earth via a rectifier G15. Which appear as earth impulses the charge pulses transmitted by the c-core cause no current in the reverse winding II, see above that the counter Z is excited via the response winding I. In contrast, both generate windings when they arrive of identification impulses counteracting each other, the resulting Flooding is insufficient for counter Z to respond.

In the circuit arrangement according to FIG. 3, the counter Z is located with its response winding in the shunt arm of a bridge circuit which is dimensioned so that the current pulses occurring during identification in the shunt arm are insufficient to respond to the counter. The two series branches of the bridge circuit are connected on the one hand to the c-wire and on the other hand to a potential of -48 V or to ground potential. One series branch consists of a rectifier G16 and the two resistors R 21, R 22 and the other consists of a resistor R 23 and a rectifier G17. The connection point between the rectifier G16 and the resistor R 21 is connected to ground via a further rectifier G18. In the shunt branch there is also a rectifier G19 in series with the counter Z. The resistors R 21, R 22 are dimensioned, for example, so that a potential of −20 V prevails at their common connection point. The charge pulses (earth potential on c-wire) do not change this potential of - 20 V, while earth pulses are fed to counter Z via rectifier G19, to which counter Z responds. The identification pulses with a potential of e.g. B. + 48 V, however, have the consequence that the potential at the connection point between the resistors 5 "-R21 and R22 is raised to ground potential, whereas the potential at the rectifier G19 is limited to ground potential by the conductive rectifier G17 at the same time, so that in The arrangement can also be made so that the potential at the connection point between the resistors R21, R22 even exceeds the earth potential when identification pulses arrive. In this case, the rectifier G19 prevents the counter Z from responding by reversed current pulses Direction: So that current does not flow continuously via the rectifier G18 and the resistors R 21, R 22, a normally open contact of the isolating relay T (FIG. 1) can be arranged in series with the resistor R 22.

There is also the possibility of a central location, e.g. B. in the central marker ZM to provide switching means that interrupt the counter circuit for the duration of the identification pulse, for example at the point χ in the central marker ZM (Fig. 1). Means are also to be provided here which prevent the counter Z from falling during the interruption in the event that an identification pulse coincides with a charge pulse.

Under certain circumstances, there may be test circuits in addition to a central test circuit be advantageous for the test if the test potential of the test circuits in contrast for the embodiment of FIG. 1 is different from that of the central test circuit, so that the test potential of an occupied re-test circuit to the central test circuit when it is switched on blocks the same connection path. In this way, he has to clear a connection path waiting subscriber guarantee that his connection request is taken into account first.

In certain cases it may be necessary to indicate the busy case not only by the absence of the dial tone, but by an additional indicator. For this purpose, in a circuit arrangement according to FIG. 1 in the central marker ZM, a second, basically identically constructed test circuit can be provided in addition to the already existing test circuit, in which only the polarity of the rectifier Gl in the test circuit would have to be reversed.

Claims (10)

PATENT CLAIMS: 1. Circuit arrangement for the transmission of several license plates via a signal wire in telecommunications switching systems with couplers, e.g. B. in telecommunications private branch exchanges, for the purpose of identifying the various operating states a call station on the signal wire with the connection path switched through, characterized in that that the identification by the application of different potentials to the signal wire takes place and the various operating states by comparing these potentials with them different potentials are checked and that further characteristics in the form of the respective potential on the signal wire superimposed pulses are transmitted. 2. Circuit arrangement according to claim 1, characterized in that the test potential for the free test between the potentials characterizing the free and occupied cases and the Test potential for determining the type of busy situation between the internal and the external busy case harbors characteristic potential. 3. Circuit arrangement according to claim 2, characterized in that the test circuit for the potential comparison contains a pulse transformer (IT) which carries several windings on a core made of a material with a rectangular hysteresis loop, of which a first winding (Wl) in the test circuit, one the second (W 2) is connected to a reverse magnetization circuit and a receiving device (CA, Cl, C2) is connected to at least one further winding (W 3), so that when the test circuit is switched on, if there is a potential difference, a current flows through the first winding of the pulse transformer, of the core 209 677/81 transferred from one state of saturation to the other, and the reverse magnetization of the core in the further winding generates a pulse for actuating the receiving device. 4. Circuit arrangement according to claim 1, characterized in that for the subscriber identification Pulses are used whose duration is only a fraction of the minimum duration of the charge pulses and their potential that of the charge impulses exceeds. 5. Circuit arrangement according to claim 4, characterized in that sohaltmittel (GIl, R 13; II; G16-G19, R21-R23) are provided which prevent a counter (Z) present for receiving the charge pulses from responding to the identification pulses. 6. Circuit arrangement according to claim 5, characterized in that means (GH) are provided which are the voltage that can occur as a result of the identification pulses on the meter, limit. 7. Circuit arrangement according to claim 5, characterized in that the counter (Z) has a second winding (Fig. 2), which provides a counter-excitation during identification: causes. 8. Circuit arrangement according to claim 5, characterized in that the counter is in the shunt arm of a bridge circuit (Fig. 3) which is so is dimensioned that the current pulses occurring in the identification in the shunt branch to respond of the counter are not sufficient. 9. Circuit arrangement according to claim 5, characterized in that at a central point (ZM in Fig. 1) switching means (at point x) are provided, which interrupt the counter circuit for the duration of the identification pulse, and that means are also provided which Prevent the counter from dropping during the interruption. 10. Circuit arrangement according to claim 2, characterized in that in the presence of re-test circuits in addition to a central test circuit for the free test the test potential of the review circuits is different from that of the central test circuit, so that the test potential of an occupied re-test circuit the central test circuit when it is switched on blocks on the same connection path. Considered publications:
German interpretative document No. 1011 939. 1 sheet of drawings