DE1487972B2 - CONTROL PROCEDURE FOR A REMOTE COMMUNICATION, IN PARTICULAR TELEPHONE SWITCHING SYSTEM, WITH CENTRAL CONTROL DEVICES - Google Patents

Description

correct memory section of memory line the number of the called subscriber is recorded and that with an external connection this predetermined Memory section is used as a buffer memory for the series of dialing pulses to be forwarded. By This simple switchover in the memory line can also be used to forward the incoming dialing pulse series in the central control part of the system. The special identifier to introduce this Switching is a function of the choice of a traffic elimination digit in the predetermined Memory section of the memory line entered.

The buffering of the dialing pulse series and the forwarding to the outgoing connection line is according to the invention thereby effected that the buffering of the dialing pulse series to be forwarded in two Storage locations of the predetermined memory section of a memory line is carried out that the incoming dialing pulses are added up in the first memory location that after storing the first dialing pulse of a series of dialing pulses, a pulse generator is connected to the outgoing connection line that the output from the pulse generator Pulses are added up in the second memory location and that at the end of the Wafilimpulse series And match the information stored in the first and second memory location of the pulse generator switched off and the buffer memory is deleted. In this way a central pulse generator can be used be used, the transmission of the dialing pulses over all outgoing connection lines takes over. The impulse generator is shut down individually via gate circuits that control the connection sets assigned for outgoing connections. These gates are via the central Logic controlled in the time slot allocated to the associated connection.

The invention is based on a basic circuit diagram of a telephone exchange with time division multiplex control explained in more detail.

In the basic circuit diagram, the coupling network of the telephone exchange is shown with KN , to whose inputs the subscribers TInA and TInB are connected. At the output of the switching network KN , connection sets VSi for internal connections are connected, the outputs of which are routed back to the coupling network KN in a known manner.

The outgoing traffic from this system leads via connection sets VSa, which are also connected to the output of the switching network KN .

The subscriber circuits and the connection sets are scanned by a scanning device A cyclically. The switching status of the scanned devices is continuously transmitted to the central logic L via this scanning device A. The central logic L allocates a memory line Rl ... Rn of the memory MR to each connection being established. In each of these memory lines, for example R1, there is a memory section RT in which the number of the calling subscriber is entered. The memory section GT records the number of the called subscriber, which is also supplied via the scanning device A and the logic L, for example.

The memory cells Rl ... Rn are interconnected cyclically with the central logic L. Included

■. the content of the memory cell is taken over from a pre-store VSp. On the basis of this information, the logic L makes the decisions, such as, for example, the setting of the switching network KN via a marker (not shown).

As long as the connection remains in one's own office, the control method according to the invention differs not from the known procedures. the

ίο Storage location K of the storage lines Rl ... Rn does not contain any special identifier.

However, if it is an external connection that is forwarded via a connection set VSa , then the central logic L adjusts this

υ Record part of the phone number. The special identifier is entered in memory location K of the assigned memory line. The already recorded part of the call number determines the outgoing line to be selected with the connection set VSa.

The memory line is switched after the occurrence of the special identifier so that the memory section for the called number acts as a buffer memory. The incoming dialing pulses are added up in the first memory location Z1 of this memory section. After receiving the first dialing pulse, the gate circuit T leading to the selected connection set VSa is opened via the central logic L , so that the pulses from the central pulse generator IG can reach the outgoing line directly via the connection set VSa. The pulses of the pulse generator arrive at the same time via the central logic L to the second memory location Z1 of the memory section and are added up there. The counter reading of the memory location Zl is therefore always back by one dialing pulse. In the pause between two series of dialing pulses, the count in the second memory location equals the count in the first memory location. The number of dialing pulses sent out corresponds to the number of dialing pulses received.

When this coincidence occurs, the gate circuit leading to the assigned connection set VSa is blocked and both storage locations are deleted. The buffer memory is then ready to receive and forward a new series of dialing pulses.

In many cases it is also the case that some of the recorded dialing digits, which are required to determine the direction of traffic, have to be transferred to the next office afterwards. In this case, the entire number of the called subscriber is entered in the memory section GT and stored out digit by digit with the help of an additional memory location by the central pulse generator. A free dialing time is inserted between two series of dialing pulses, after which the system switches to the next occupied memory location. This process is repeated until the memory section GT is free in the memory line. After a series of dialing pulses has been transmitted, which is present when the counter readings of the memory location involved and the additional memory location coincide, these two memory locations are deleted.

1 sheet of drawings

Claims (5)

Patent claims: 1. Control method for a telecommunications, in particular telephone exchange, with central control devices that work in time division multiplexing and have a memory from which a memory line is available for each connection setup, characterized in that the memory (MR) in each memory line (.Rl ... Rn) has a memory section (K) for a special identifier to distinguish between internal (VSi) and external connection (VSa) that depending on this special identifier in an internal connection in a predetermined memory section (GT) of the memory line (Rl. ..Rn) the number of the called subscriber is recorded and that, in the case of an external connection, this predetermined memory section (Zl, Z2) is used as a buffer memory for the series of dialing pulses to be forwarded. 2. The method according to claim 1, characterized in that 'the special identifier is entered in the predetermined memory section (K) of the memory line as a function of the choice of a traffic elimination number. 3. The method according to claim 1 and 2, characterized in that the buffering of the dialing pulse series to be forwarded in two memory locations (Zl, Z2) of the predetermined memory section (GT) of a memory line (Rl ... Rn) is carried out that the incoming dialing pulses in the first memory location (Zl) are added up, that after storing the first dialing pulse of a series of dialing pulses, a pulse generator (IG) is connected to the outgoing connection line (VSa) , that the pulses emitted by the pulse generator (IG) are added up in the second memory location (Z2) and that at the end of the series of dialing pulses and the information stored in the first and second memory locations match, the pulse generator (IG) is switched off and the buffer memory is cleared. 4. The method according to claim 3, characterized in that the pulse generator (IG) is coupled via gate circuits (T) to the connection sets (VSa) for outgoing connections and that these gate circuits via the central logic (L) in the assigned connection Time slot can be controlled. 5. The method according to claim 1 and 2, characterized in that the buffering of the dialing pulse series to be forwarded is carried out together with all or part of the code to be forwarded in the memory section (GT) of a memory line that the pulses of a central pulse generator ( IG) are added up in an additional memory location of this memory line and are sequentially compared with the memory locations of the information to be forwarded, that if the two items of information to be compared match, the corresponding memory location and the additional memory location are deleted and that after a free selection time, the comparison and the Forwarding of the dialing pulses is carried out according to the information in the following memory location. The invention relates to a control method for a telecommunication system, in particular a telephone exchange, with central control devices which are time-division multiplexed work and have a memory from which a memory line for each connection establishment Available. Such a time division multiplex control is particularly economical, since the Koppehietz and the connection and connection-specific facilities can be designed very easily. All for building Decisions necessary for a connection are made by a central logic that is cyclical is interconnected with the memory lines of the memory. The memory lines of memory can be assigned to a connection establishment via the logic, they save all data of this connection establishment, such as the number of the calling and called subscriber, authorization identifier, position identifier of the devices involved, etc. The establishment of a connection in a telecommunications, in particular Telephone system with such a time division control brings no problems as long as the connection remains in your own office. If, however, after recording a code, it is determined that if it is an external connection, then the difficulties arise. The following series of dialing pulses are then to be fed directly to the continuing line. In the case of the known time division multiplex controls, the connection set allocated to the connection indicates a direct forwarding of the incoming Dialing pulses switched. This changeover must take place in good time so that no dialing pulse is lost goes. Appropriate precautions must therefore be taken when the register is switched off. Also are all connection sets for external connections with the switching means for receiving and forwarding to equip the electoral impetus. In the case of coupling networks with electronic switching elements, the direct Forwarding of the dialing impulses from the subscriber line via the coupling network to the connection set not easily possible. In many cases, the conversion of the dialing pulses to alternating current signals is less Performance required. This implementation of the election impulses requires in the connection-specific institutions again, expensive receiving facilities. It is the object of the invention to provide a control method for a telecommunications, in particular telephone switching system, to be specified with central control units, with which also the forwarding of the dialing impulse series to external connection lines can be carried out entirely in the central control section. In the connection sets of the_external connections sol-5 len no additional switching means are required and transmission of the dialing pulses via the Coupling network should be avoided. The control method for a telecommunication system, in particular a telephone exchange, with central control units that work in time division multiplexing and have a memory from which for each connection structure a memory line is available, is characterized according to the invention in that the Memory in each memory line a memory section for a special identifier for differentiation between internal and external connection that depends on this special identifier in the case of an internal connection in a