DE1804625A1 - Telecommunication, in particular telephone switching system, with a two-stage switching network of coordinate switches - Google Patents

Description

Ferninelde-, in particular telephone switching system with a two-stage coupling matrix from crossbar switches The priority of registration no 48470/67 of October 25, 1967 in Great Britain is used.

The invention relates to a telecommunications, in particular telephone exchange, with a two-stage coupling field of crossbar switches, each with an intermediate line between each coordinate switch of the first coupling stage and the coordinate switches the second coupling stage and with overflow lines between the crossbars the first coupling stage.

Switching systems of this type are known to be simple and economical built up. However, they have the disadvantage that a so-called. Inner Blockage Can Occur This blockage occurs when a certain Connection from a requesting input to an output of an output group is needed; but although the desired starting group is one or more free Has outputs, the requesting input cannot match an output of the desired one Group are connected because all intermediate lines that have this connection could be produced are proven. To avoid this disadvantage, it is known Overflow lines between the crossbars of the first coupling stage of the two-stage Provide coupling matrix.

The object of the invention is to provide a Pernmelde-, in particular To create telephone exchange of the type mentioned, in which the Measures for the overflow are improved. This is achieved according to the invention achieved that the overflow lines between the multiple lines of the coordinate direction coordinate direction corresponding to the crossbar input multiples run and that for the production of overflow connections first the one to be connected Input of a coordinate switch of the first coupling stage via this coordinate switch with one of its overflow trunk lines and then the one with that overflow trunk line connected overflow trunk of another coordinate switch of the first Coupling stage via this coordinate switch with one to the desired output or Free intermediate line leading to the desired output group by pressing corresponding switching elements of the two crossbar switches are connected 0 According to Further developments of the invention is the calling subscriber line over a subscriber switch and a trunk switch, which as above is designed as described, connected to a register, which is based on the election information determines whether the connection should lead to another exchange; if this If this is the case, the register causes the allocation of a corresponding outgoing Trunk, after which itom registers a connection through the trunk switching matrix is established to this connection line; then the number called is from Register via the trunk switching network and via the outgoing trunk transmitted to the remote exchange; after this transfer will establish a connection from the calling @@@ subscriber line to the outgoing connection line manufactured, whereupon the register triggers; if a direct connection from drio ~ the calling subscriber line to the outgoing connection line connection is not possible due to an internal blockage established via the register, the connection paths between the calling line and the register and between the register and the line transfer.

The invention will now be explained on the basis of exemplary embodiments.

It shows: FIG. 1 the two-stage switching network of the switching system according to the invention Figure 2 shows the schematic structure of a switching system, in which the two-stage switching network can be used and FIG. 3 shows a further construction scheme a switching system.

In the switching system to be described, the coordinate switches have relatively small capacity, as suggested elsewhere.

The basic idea behind this finding is that every overflow pipe with two multiple lines of the same type in different crossbars the first coupling stage is connected. Deho if the inputs of the coordinate switch the first coupling stage are led to the vertical multiple lines, so are the overflow lines are also connected to vertical multiple lines. In contrast for this purpose, in known arrangements, the overflow lines are between vertical multiple lines a coordinate switch in the first coupling stage and horizontal multiple lines in another Coordinate switch of the first coupling stage connected 0 The present invention has the advantage that the link capacitance of the two-stage switching network is not reduced in that overflow paths are provided Need to become.

The crossbar switches in Figure 1 each have eight inputs and sixteen outputs to 0 The switching network has a first switching stage A, which consists of eight KoppSlblocks A1-A8. Of these coupling blocks are only the coupling blocks A1, A2 and A8 fell. Each of these coupling blocks has two crossbar switches whose horizontal multiple lines are connected in series and their bridge magnets are connected in parallel, so that the corresponding bridge magnets from both crossbar switches can be operated at the same time.

These two crossbar switches thus form a single crossbar switch with sixteen entrances and sixteen exits after.

There are also sixteen crossbar switches B1 "B16 in a second one Coupling stage B available. Such a Kordinatenschal ter has eight inputs, the Via an intermediate line Z1 with the crossbar switches A1-A8 of the first Coupling stage are connected, and sixteen outputs on. This can be seen in FIG Recognize the connection scheme of the switching stages, which is such that each Input of a crossbar switch A Access to each crossbar switch output B hat0 The overflow property of the two-stage switching network will now be explained will. Of the eight inputs of each crossbar switch, each one Half of a switching network, two inputs are used for the overflow. From Figure 1 it can be seen that in each of these crossbar switches the inputs 7 and 8 can be used. It should be noted that for the Pall there are four overflow lines per coupling block these are all arranged in only one of the two coordinate switches need to be.

If the overflow inputs of a coupling block of coupling stage A are closed lead different overflow inputs of the other coupling blocks of coupling stage A, then the probability of access to the exits is greatest. The connections the transition from the coupling block A1 to the other coupling blocks for example as follows: a) Input 7 of the left coordinate switch of the coupling block Al is via an overflow line a to the input 7 of the left Coordinate switch of the coupling block A2 connected; b) the input 8 of the left Coordinate switch of the coupling block A1 is via an overflow line b with the Input 7 of the left crossbar in the coupling block A8 connected; c) the entrance 7 of the right crossbar in the coupling block A1 is via an overflow line c with input 7, not shown, of the left crossbar, not shown connected in coupling block A3; d) input 8 of the right crossbar im Coupling block A1 is connected to input 7, not shown, via an overflow line d of the left crossbar (not shown) in the coupling block A7.

The number of overflow entrances required and the connection scheme Of course, there are various coupling blocks between the overflow entrances on the traffic conditions for the switching system in which the switching matrix should be used. Hence it may be necessary to have more or less than two of use eight inputs for the overflow.

If a connection is to be established, tries the one not shown and a conventionally designed control circuit to establish a direct connection. Although now the desired group of exits has at least one free exit can have, it can happen that the connection cannot be established, because an internal blockage of the switching matrix. For example, if an input of the coupling block AS with one of the outputs of the coordinate switch B2 is to be connected, a direct connection may not be possible because the Intermediate line h2-B2 is already in use0 But because it is a calling input there that has not yet been connected, and there the number of the outputs of the number corresponds to the input, there must be at least one output, namely at least one horizontal Multiple line 1 can be used in the coupling block A2. The control circuit knows the state of the switching matrix and then looks for an intermediate line A-B, the 1. is free and has access to the crossbar 32 and the 2nd to a crossbar A is connected to the calling coupling block via an overflow line AL is connected.

It is assumed that the intermediate line labeled Z @ A1-B2 The control circuit now determines that this connection is via this intermediate line should be produced. Therefore, the one associated with the calling input becomes vertical Multiple line in the coupling block A2 with a free horizontal multiple line connected in xoppelblock A2. Furthermore, this becomes free horizontal trunking with the vertical multiple line Nr0 7 of the left coordinate switch in the coupling block A2 is connected, and in the coupling block Al, the vertical multiple line no. 7 of the left coordinate switch with that horizontal multiple line in the coupling block Al connected to the the Intermediate line A1-B2 is connected. An overflow connection therefore requires three coupling points in the switching stage A.

This described arrangement can be used to connect calling lines are used with outputs, change the following coupling stages and / or a register are connected, or this arrangement can be used as a switching matrix, which for example, outputs of other switching matrices connects to feed sets or connection sets.

A switching system using the switching matrices in this way is shown schematically in FIG. There the switching system has four subscriber switching networks LSU1-LSU4, which are each designed in two stages, from crossbar switches exist and each serve a large group of subscriber lines. the first switching stages of the subscriber switching networks consist of sixteen switching blocks A with sixteen outputs each connected to subscriber connection lines are. Thus 256 subscriber lines are connected to each switching network.

However, the subscriber switching networks can also be used for better utilization for example thirty-two crossbar switches A with sixteen outputs each have, so that such a subscriber switching network 512 subscriber connection lines served.

The inputs of the switching stages B of the subscriber switching matrices are on one side of a mixed ring feeder (main distributor) MDF connected, its other side with the inputs of two connecting line switching networks DSU1 and TSU 2 is connected. Each trunk switch is designed as it is shown in Figure 1. The overflow connections are in figure 2 indicated by a loop OC. As by one of the subscriber switching network LSU1 associated, dashed loop is indicated, the described overflow technique can also be used if it is desired in the subscriber switching networks.

The outputs of the trunk switching matrices are to internal connection sets LJ, each of which is connected to two of these outputs. At the outputs sinfiefsefeer bi-directional connection lines TO and likewise Reg connected. If there is a connection request, the caller will first Connected via the switching matrices to a free register Reg, in which the dialing information is entered. Then a new connection becomes an internal connection set from the subscriber LJ or to a line transmission TC established, whereupon the old connection to the register is triggered.

Connection lines that can be used for incoming connections can have direct access to the registers.

Figure 3 shows the arrangement of a switching system in a telephone network with converter function, the coordinate switch being shown schematically as a rotary selector are shown.

When a connection from a calling line to a desired line located in another exchange is to be established in a telephone network with a converter function. the register receives the desired number, do the math rosition number of the exchange to determine the connection path over which the desired exchange can be reached, and occupied) a connecting line leading in the corresponding direction. Then the dialing characters corresponding to the converted number or a necessary part of this number are sent out from the register. As soon as the transmission of the dialing characters is finished, the calling subscriber line is connected to the disconnecting connection line, and then the register and the connection to the register are triggered connected to free registers Reg. This register then sends a dial tone to the subscriber, and this subscriber dials the desired number, which is received and stored in the register. The register causes a necessary conversion, and if the connection turns out to be a local connection, then an internal connection set, not shown in FIG. 3, is occupied. The two ends of this internal connection set are then connected to the calling subscriber line and the called subscriber line. The connection between the calling subscriber line and the register and also the register itself are now triggered.

All three connections, namely the connection from the calling subscriber line zum Re ggster, the connection from the calling subscriber line to the connection set and the connection from the connection set to the called subscriber line, can be made using overflow pipes if necessary, if such are provided 0 If otherwise the registry determines that it If the connection request is an outgoing remote connection, occupied the register with the help of a marker (not shown) a connecting line, who has access to the desired exchange. Such a connecting line is designated in Figure 3 with OGTC. A connection path is established between the register and this connection line established. This connection path is shown in FIG. 3 labeled A-B-C-D. The dialing information is now via this connection path transmitted to the remote exchange.

As soon as the transmission of the dialing information and the selection process in the remote exchange are finished, which can be indicated in the register by the receipt of a selection sign, the calling subscriber line is connected via a new connection path.This new connection path is indicated schematically in Figure 3 by the dashed line . Those crossbar switches to which the calling subscriber line and the connection line are connected are used for this new connection path. On the other hand, a completely new connection can generally also be established. After this new connection path has been established, the connection from the calling subscriber line to the register and the connection from the register to the connection line are released0 If, when trying to establish a connection from the calling subscriber line to the connection line, it is found that such a connection is not due to an internal blockage can and even not help the Exercises can be established, then the existing register connections are used to establish the connection.

Therefore, the calling subscriber line remains with the register and the register is connected to the connection line. The This register connection has the advantage of that in rare cases in which a blockage occurs in the manner described, a connection that has already been set up to the remote exchange is not lost goes.

8 claims 2 newspapers with 2 figures

Claims (8)

Claims 1.) Telecommunication, in particular telephone switching system, with a two-stage coupling field of crossbar switches, each with an intermediate line between each coordinate switch of the first coupling stage and the coordinate switches the second coupling stage and with overflow lines between the crossbars the first coupling stage, characterized in that the overflow lines (a, b, c) between multiple lines of the coordinate direction of the @oo @@@@ atenr @ entung coordinate switch input multiple lines appropriate and proceed that for the production of overflow connections initially the input to be connected of a crossbar switch of the first coupling stage this crossbar with one of its overflow highways and then the another's overflow trunk connected to that overflow trunk Coordinate switch of the first coupling stage via this coordinate switch a free one leading to the desired output or to the desired output group Intermediate line by actuating the corresponding switching elements of the two crossbar switches get connected. 2,) Telecommunication switching system according to claim 1, characterized in that that each coordinate switch of the first coupling stage has two identical coordinate switches small capacitance is formed, the output side are multiple-switched, and that each of these two crossbar switches has at least one overflow trunk having. 3.) Telephone exchange according to claim 1 or claim 2, characterized in that the two-stage switching network (TSU) or several such Coupling matrices as connecting line coupling matrices in addition to a multiple two-stage Subscriber switching matrices (LSU) are used, with the one or more two-stage Coupling matrices (TsU) on the input side with inputs of the coupling matrices (LSU) and wherein the outputs of the subscriber switching networks with subscriber lines and possibly with connection lines leading to various other exchanges connected 0 4. Telephone switching systems according to claim 3, characterized in that connection sets each with both line ends to two inputs of the resp. the two-stage switching matrices are connected and that register are provided, each of which has at least em.en input of the two-stage Switching matrix is reachable. 5. Telephone exchange according to claim 3, characterized in that that line transmissions granting access to remote switching centers are provided are, each of which with an input of the two-stage switching matrices (connecting line switching matrices) connected is. 6. Telephone exchange according to claim 5, characterized in that that a calling subscriber station first via a subscriber switching network and a Two-stage connection line coupling eleven connected to a free register that while the connection remains within the exchange afterwards a free internal connection set is occupied and the calling subscriber line and the called subscriber line via the subscriber switching network and the two-stage Connection switching field with the two line ends of the assigned connection set connected and that afterwards the register and the connection to it are released will. 7. telephone exchange, according to claim 6, characterized in that that with an outgoing remote call access to the desired exchange line transfer granted and this to a register via the two-stage Connection switching network is coupled that one of the called number corresponding Dialing information from the register via this trunk switching network and the line transmission is transmitted to the remote exchange and that afterwards the calling subscriber line is connected to the line transmission and the register and the connection to it are released. 8. Telephone exchange according to claim 7, characterized in that that in the case where there is no connection from a Calling line either directly or via an overflow line to the busy line transmission is possible, the connection to the register is established, whereby the connection paths between the calling line and the register and between the register and the Line transmission can be used.