DE1155821B - Circuit arrangement for telephone systems with separate adjustment and speech paths - Google Patents

Description

The subject of patent application T 20777 Villa / 21a ³ is a circuit arrangement for telephone systems with separate setting and speech paths and with a subscriber line circuit assigned to a calling subscriber, the connection of this subscriber to a free connection set and when influenced by the calling subscriber Subscriber set marking device of the setting path the switching through of the subscriber to be called identified by the marking device to the control device occupied by the calling subscriber and with subscribers with different intrusion authorization. If connections are established in such systems by a subscriber who is not authorized to intrude, the subscriber to be called, identified by the marking device, is not switched through to the connection set occupied by the calling subscriber, because in this case the marking device detects that the subscriber to be called is busy in his subscriber line circuit and so that the setting of the coupling stages that lie between this subscriber circuit and the connection set occupied by the calling subscriber is prevented. However, the main patent application enables the already occupied subscriber identified by the marking device to be switched through to the connection set occupied by the calling subscriber in that the busy subscriber lines to be called are applied by switching means of the relevant connection circuits to the marking wires leading from the marking device to the control device and an influencing of this device by the busy potential which prevents the marking potential on these wires can be switched ineffective by the switching means of the setting path occupied by the calling subscriber, which indicates the activation authorization of calling stations.

The connection of any occupied potential to an occupied marker wire takes place in the main patent application via switching means arranged in the registers of the adjustment path, which enable the activation of the respective calling subscriber. Is the relevant calling party not authorized, the busy potential for the individual subscriber circuits is available Leading wire preparatory to earth, so that when a subscriber line is activated, which is already occupied, this earth potential is effective

Circuit arrangement

for telephone systems with separate

Adjustment and speech paths

Addition to patent application T20777 Villa / 21a ³
(Interpretation document 1139 158)

Applicant:

Telefonbau and Normalzeit GmbH,
Frankfurt / M., Mainzer Landstr. 134-146

Erich Gaugel, Frankfurt / M.,
has been named as the inventor

can be to prevent the formation of a marking potential on the marking wire. Is the however, the respective calling subscriber is authorized to connect, according to the main patent application, the Ground potential disconnected from the wire concerned, so that it does not affect the assigned marker wire can and the relevant subscriber connection with regard to its through-connection via the switching stages treated as a free subscriber to the connection set occupied by the calling subscriber will.

This arrangement of the main patent application has the disadvantage that between the individual registers the adjustment path of a telephone system and the individual subscriber connection circuits connection paths are to be created through which the individual subscriber connection circuits are influenced can. The invention avoids this disadvantage of the arrangement shown in the main patent application characterized in that identified by the intrusion authorization of a calling subscriber Switching means of the marking device the potential of a subscriber to be called the respective subscriber assigned marker wire is changed so that the influence of the if the subscriber to be called is busy, the busy potential on this wire is compensated. This means that it is no longer necessary to

309 728/77

union intervention in the subscriber-specific connection circuits to be carried out, as the identification of whether a subscriber circuit has been activated by an authorized person or a subscriber who is not authorized to intrude is controlled only by the level of the respective marking potential is displayed. Is it an authorized user? Participant, the marking potential applied to the marking wire is so great that the influence of the occupied potential, that is switched on in the subscriber line circuit to the relevant marker wire is compensated, while in the case of a subscriber who is not authorized to intrude the relevant Busy potential closes the connection of the subscriber controlled via the marking device the connection set occupied by the calling subscriber is prevented.

An exemplary embodiment of the invention is shown in the drawing.

While the subscriber line circuit is shown in detail, the remaining part of a telephone system with separate setting and speech paths according to the invention is only shown schematically. The connection is established, as can be seen from the drawing, via a two-part subscriber selection level TW level and via a likewise two-part group selection level GW level. The traffic within the subscriber selection level TW level is double-directed, while the traffic in the group selection level GW level is single-directional. In addition to the subscriber circuits TS, there are connection sets VsA and VsB in the speech path and connection sets VsC for calls arriving via connection lines. The adjustment path contains registers RGl and RG II for receiving the individual selection information, and also tax records StT, StA, StB and StC as well as an evaluator AW that evaluates the selection information and a subscriber allocator TZu. The register RGl or .RGII is coupled to the connection sets VsA or VsC via register coupling stages RKI or RK II. Here, the register RG II is provided for the traffic arriving via connecting lines, while the register RGl is for the outgoing traffic from the individual subscriber connection circuits Traffic serves. The number of existing registers RG I or RG II depends on the size of the facility or the traffic to be expected.

If the subscriber connected to the subscriber circuit TS hangs his handset, the call relay R responds via the subscriber line and the closed contacts / · 2 or ti and ti . With its contact r3, this applies marking potential to the subscriber's own marking wire leading to the control rate StT. Switching means (not shown) ensure that only one connection can be established at a time.

As indicated schematically in the drawing, the calling subscriber is marked according to individual line and group membership in the control rate StT. In addition, the tax rate StT assigned to the respective subscriber group arranges the calls within its subscriber group and determines the intermediate lines of the subscriber selection level that are accessible and assignable to the calling connection and that run between the A and the .B part of the subscriber selection level TW level . The tax rate StA , which is also occupied by the tax rate StT , finally determines one of these intermediate lines. Suddenly, controlled by the two tax rates ft Γ and StA, the connection is switched through via the A and ß part of the subscriber selection stage to a connection set marked by the tax rate StA for the outgoing traffic VsA. A register RG I is connected to this connection set VsA via the register coupling stage RK I

ίο on. When a calling subscriber line is marked by the tax rate StT of the relevant subscriber group, the class affiliation of the relevant line is also determined at the same time and communicated to the tax rate StA. From this tax rate, the relevant class designation is transferred to register RG I.

After the RG I register has been connected to the connection set VsA, which was occupied by the calling subscriber, the dialing signal is sent out and the subscriber in question can now start dialing. The calling subscriber receives his feed current from the connection set VsA. The dialing information recorded by the register RG I is checked by the evaluator AW to determine whether it is a continuing connection or an internal connection. For this purpose, the evaluator AW switches on briefly to the register after the first digit has been recorded and immediately switches off again if a direction determination is not yet possible on the basis of this first digit. The connection of the evaluator AW to the register RGl is repeated after the other digits have been selected. At the same time, it is also checked whether the calling subscriber has access to the desired traffic direction based on his class identification, which is recorded in the register.

If the evaluator AW recognizes that an internal subscriber is being dialed, it marks the connection to be set up as internal in the register RG1 and first switches itself free again. The register only reports again when the number of the connection to be controlled is fully selected. After the last digit of this number has been recorded, the evaluator AW is connected to the register RG I again. He fetches the pulse series required to determine the selected subscriber from the register and transfers them to the subscriber allocator TZu. This subscriber allocator is available once for each exchange and is used to identify the subscriber lines called. This identification is carried out by applying negative potential to the marking wires leading from the subscriber allocator TZu to the individual tax records StT, which are allocated to the individual subscribers.

The transfer of the identification of the respective subscriber to be called from the evaluator AW into the subscriber allocator TZu takes place via cores rum over which the relevant call number is given in coded form to a recording device H, E of the subscriber allocator TZu . From this holding device H, E for receiving the telephone numbers of each to be driven user connections, the actuation of corresponding marking contacts e and h is the group membership is carried out, wherein by closing the contacts e h is the position of the individual line within a group, and by closing the contacts of the person concerned

the subscriber line is recorded. An AND circuit made up of a resistor Wi 3 and two diodes Dl and D 2 is used to apply a corresponding marking potential of -24 volts to the subscriber marking wire TIn-M. If the subscriber line in question, to which this subscriber marking wire leads, is free, a potential of approximately -8 volts is formed at the marking point M. This potential corresponds to that at

worthy AW applied to the gate circuit To of the subscriber allocator TZu . After transmission of the Rufnummermarkiemng from the evaluator AW in the receiving device H, E of the subscriber-5 assigning TZu , a potential is also applied to the second input of the gate circuit To , which leads to the opening of the gate To , so that now the transistor Tr of his Locked state is transferred to its state of greater conductivity. Above

This point M prevails if the relevant Teil- io the emitter-collector path of the transistor Tr is the taker should hang up his receiver in order to now establish a potential of -60 volts at the relevant connection, so that the subscriber marker wire TIn -M. In spite of the group and individual line affiliation of the ground potential connected via the wire TIn-M resistor Wi 2 through the contact ί 2 via the marking of this subscriber, the higher marking-related connection in the control rate StT in the 15 potentials of -6OVoIt at the marking point M as described above Way held and to build up a marking voltage of about -8 volts, a connection from this subscriber line to which is sufficient to initiate the determination of the already occupied connection set evaluated by the marked subscriber in the control rate StT. The tax rate StB, which can be influenced by the evaluator switching this subscriber through the relevant AW as well as by the tax rate StT of the called subscriber group of 20 speaking coupling stages to the connection set VsA subscriber group, switches on the one hand to be carried out in the manner described above,
to connection sets VsB from the tax rate StT despite the fact that the subscriber to be called is busy

The marked subscriber group on as well as the other is now the one occupied by the calling subscriber on the part of the interconnection set VsA designated by the register RGl via the group selection level interconnection lines of the group selection level of the relevant- 25 GW level as well as the subscriber selection level TW level of the subscriber group. The tax rate StB and the associated with the called subscriber, where

However, the switching contacts of the respective test relays of the individual stages in the speech path are still open. The relay P controlling these contacts TW level, a free connection set VsB and 30, which is schematically indicated in the connection set VsB as a free intermediate line of the group dialing level, cannot yet respond because the subscriber circuit in question is blocked by another, already existing connection. If the calling subscriber wants to pass through the connection set VsA marked by register 35 to the occupied subscriber found, while target point, he can, for example, post-dial a digit from the subscriber allocator TZu via the wire and thereby the relay / that is in the connection set TIn-M marked subscriber circuit TS is. The VsB is shown schematically, temporary connection will respond across all switching stages. Connected through contact i and abruptly. From the connection set 40 the still closed break contact ρ 3 of the test VsB is the called subscriber line relay P of this connection set speaks through and receives after being unhooked from this switch relay Afs , the with its contacts afs 1 connection set also its supply current. and afs2 the contacts of the test relay P, which are in the

As already mentioned, this inter-speaking artery comes together, bridged. The relay Afs keeps circuit of the called subscriber connection with 45 itself via its winding II as well as its own connection set VsA, which is only established by the calling partial contact afs 3 in the c-wire, from which the subscriber was already occupied if the existing call connection is out minus the called subscriber is either free or if there is potential that not only the relays R and T is an energized subscriber calling the busy subscriber line circuit TS . If the subscriber is retained, however, but also the relay Afs. If this is set, the existing call is terminated via contact i2 earth potential, the minus resistance Wi 2 at the subscriber marking potential on the c-wire is removed, so that point M is switched, and when the subscriber relay R and T the occupied subscriber allocator TZu found out marking potential of -24 volt circuit TS drop. At the same time, the wire that is connected to this wire is also switched on, so a de-energized holding winding II of the relay Afs is formed , so that point M only has a maximum potential across contact afs 3, the relay? into the c-core

is switched and after hanging up the listener of the called station can come to respond in a known manner with the help of its contacts t

to allow the aforementioned connection. In this case, the voice connection from connection set VsA is not connected through to the called subscriber via connection set VsB.

A connection set VsC is assigned to the incoming connection lines. If such a connection record is occupied, it requests the connection of a register RG II via a register coupling stage RK II. The connection of the registers to the connection sets VsC is carried out by a

The tax rate StT assigned to the desired participant group now determines, in cooperation, a free intermediate line of the participant selection level

GW stage, taking into account that the marked line sections must be able to be interconnected to form a single connecting train. Starting

—5VoIt, which is not sufficient to now identify this participant in the StT tax rate of the respective participant group for the purpose of building up the

called subscriber to the connection set VsA that the calling subscriber has occupied, and this subscriber receives a busy signal in a known manner.

However, if the calling subscriber is authorized to intrude, a corresponding identification potential is generated from the output via the aum

Tax rate StC organized and controlled. As with internal connections, after the identification of the desired subscriber has been recorded by the respectively connected register RG II, the subscriber line of the desired intercom is activated and this intercom is switched through via the subscriber selection level TW level and the group selection level GW level to the incoming connection set VsC, the now takes the place of the connection set VsA for internal connections.

In the case of further connections, the evaluator AW identifies the outgoing line bundle to be controlled, while the register RGI defines the group of intermediate lines of the group selection level GW level that are to be considered for the connection setup. The tax rate StB then connects to the lines marked by the evaluator AW and the register RG I and looks for a free intermediate line that has access to a free outgoing connection line. After marking of the connecting portions to be occupied by the control set StB the compound, starting from the compound set VSA and VSC, further connected through.

Claims (1)

PATENT CLAIM:
Circuit arrangement for telephone systems with separate setting and speech paths and with a subscriber connection circuit assigned to a calling subscriber, the connection of this subscriber to a free connection set and, when influenced by the marking device of the setting path set by a calling subscriber, the connection of the by the marking device identified subscriber to be called to the control device occupied by the calling subscriber as well as with subscribers with different connection authorization according to patent application T 20777 VIII a / 21a ³ , characterized in that switching means (To) of the marking device that identify the one to be called by the connection authorization of a calling subscriber Subscriber-characterizing potential of the marker wire (TIn-M) assigned to the relevant subscriber is changed in such a way that the influence of the at Bese The presence of the subscriber to be called is compensated for the busy potential lying on this wire. 1 sheet of drawings © 309 728/77 10.63