DE2048173B2 - CIRCUIT ARRANGEMENT FOR ESTABLISHING COLLECTIVE CONNECTIONS IN A PCM TELEPHONE SWITCHING CENTER - Google Patents

Description

3 4

(August 1965), p. 2, item (3), and WP33 / XV - the one that enables the collective connection No. 9-E (December 1965), p. 10, second section, circuit arrangement organically known in the connection, those from the speech signal samples of the switching network of the PCM telephone exchange by non-linear coding, i.e. H. to be able to add. It is advantageous to continue afterwards Provision of a non-linear modulation identification 5 formation of the invention in a switching center, in line, obtained PCM signals into a linear code which converts the pulse frames of all transmission time division multiplexing, d. H. »to digitally linearize« them, the lines are synchronized with each other and the Adding "linear" PCM signals in binary form and then adding pulse frames to all receive time division multiplex lines the received sum signals in the non-linear aid of run-time code inserted in these lines implement back. A with this previously known xo break down with one another are synchronized in such a way that The method that corresponds to the method also forms the pulse frames of the transmit time division multiplex lines the subject of the German Offenlegungsschrift against the pulse frame of the reception time multi-1803 222. From the German Offenlegungsschrift plexlinien different, each by one 1 803 222 it is also known to use the “non-linear” according to a desired mean total PCM signals to be stored in the first registers between the 15 time intervals between the receiving and transmitting, they are then set up for common use one after the other with the help of a time channel allocated on each side Converter into the linear code conversion delay time (pulse frame delay time) given which have the "linear" PCM signals in the second Re time slot, whereby for the transmission of to store registers and then in an addition message signals via one with such a unification to add and finally the obtained 20 PCM time division multiplex over-sum signals connected to the switching center by means of the above-mentioned converter in the transmission line in the two transmission directions To convert »non-linear« PCM signals. In each case the same time channel within the respective The aforementioned laid-open specification is also specified that pulse frames are used to control such that in a three-subscriber comprehensive PCM-Kon crosspoint switch, each with a receive reference circuit each participant only those 25 time division lines with an intermediate line one Sum signals are supplied which are connected by such special link pair-addition the PCM signals of the other two divisible bar, and to control such crosspoint users can be obtained. switch, via which the associated transmission time

The invention does not relate to the production of a multiplex line with such an intermediate line of conference connections par excellence, but it can be connected, only one common address is located in each case it is based on the task of providing for which address telephone exchange system in a PCM- senumlaufspeicher Collective connections circulating memory on the output side directly a first D of the type specified, d. H. Connections coder and a delay element whose Verjeweils between a first participant and a delay time equal to the said pulse frame number a second decoder is connected downstream of the second, which is not one of the other 35 delay times connected participants, whose outputs to the control inputs of the first can. The invention relates to a circuit-mentioned or the second-mentioned coupling point arrangement lead to the establishment of collective connections switches. Such a training of the Erjeweils between a first participant and a discovery has the advantage of multiple use A plurality of second participants in a PCM 4 ° of the respective circulating address memory with it, Telephone exchange; this circuit arrangement by controlling it in the specified manner is characterized according to the invention, tion of both coupling network input side in the one between the receive time division multiplex point switches as well as of switching network output lines and the transmission time division multiplex lines crosspoint switches on the side are used, with which the connection switching network, which is different 45 a corresponding saving otherwise in one dimensioned pairs of address complementaries of this type required in terms of their storage time to one another Intermediate circulation storage containing intermediate storage results.

between line pairs and / or pairs of static With reference to the drawing, the invention is still

Intermediate line pairs containing intermediate storage explained in more detail.

has, a special intermediate line pair in front of 5 ° The drawing shows schematically in one view, in which one of the scopes required on the receiving side with the understanding of the invention first collective connection participant and on the transmission side a PCM time division multiplex switching center, in which four PCMs operated by wire with the second collective connection participants -Time-multiplex transferable intermediate line a PCM word circulation lines, each of which is inserted a receive time division multiplex memory and in the other receiving line, like the receiving line shown in the drawing with the second collective connection subscribers, catch time multiplex line EMLl, and a send - And on the transmission side with the first collective connection time division multiplex line, such as the intermediate line that can be connected to the subscriber in the drawing, include the series transmission time division multiplex line SMLl , circuit of a non-linear linear encoder, with other four-wire operated P CM time of a PCM word register, one of which can be connected to its second 60 multiplex transmission lines, upon input via a further PCM word register to the receiver shown in the drawing, for example, its output connected binary adder and capture time division multiplex line EMLN and the one in the one Code back converter is inserted. Transmission time division multiplex line shown in the drawing

The invention has the advantage of collecting SMLN. Connections of two PCM time-multiples of the specified type in a PCM 65 plex transmission lines, such as. B. the two PCM telephone exchange in a clear time-division multiplex transmission lines EMLIjSMLl and manner with at the same time relatively low circuit technology EMLNjSMLN, can be achieved with the help of intermediate niches and line pairs Z0 / Z6 ... Z3 / Z3 'brought about,

5 6

are inserted into the pairs of buffers, circular address memory £ 71 and to control the storage times of which are complementary to each other, on the receive time division multiplex line EMLN and that with a quasisynehron operated switching center located on the transmit time division multiplex line SMLN complementary, based on the Dop crosspoint switch of the circulating address memory UN. pelte the pulse frame delay time of duration 5. B. three time slots by which the pulse frames of the time division multiplex technology in a manner known per se (see transmit time division multiplex lines SMLl ... SMLN eg. German patents 1243 247, 1207 452) compared to the pulse frame of the reception time division multiplex in each case are staggered in time on one of the lines VML1 ... EMLN corresponding to the respective time channel. the point the addresses of those crosspoints-Such a quasi-synchronous operation of a PCM time switch is written, over which the respective Empmultiplexvermittlungsstelle is already known from the German interception or transmission time division multiplex line in the course of the patent 1 800 726; In such a single switching center routed via the time division multiplex lines, the pulse frames of all transmission / time connections are each synchronized with one another with an intermediate line to multiplex lines, and are connected. The pulse frames of all reception time 15 7Ι ... UN are also connected to the output side in multiplexed lines with HiIEe of a decoder DEl ... DEN inserted directly into these lines Outputs to the control unit, namely in such a way that the pulse frames went to those crosspoint switches that are un- 20 EML1 ... EMLN on the transmit time division multiplex lines compared to the pulse frames of the receive time division multiplex lines on the relevant receive time division multiplex line. In addition, each of the terschiedliche, with an Vergewünschten mean total time interval between deceleration membered Vtv a second decoder DSl ... DSN the downstream of the receiving end or transmitting end allocated by a respective accordance with an address circular memory Ul ... UN, whose outputs to the Steuerein-time channels Defined delay time (pulse frame transitions of the relevant transmission time division multiplex delay time) have the given time slot, with 25 lines SMLl ... SMLN leading crosspoint for the transmission of message signals via switch. The delay time of the individual delay elements Vtv connected to such an exchange is equal to the PuIs-PCM time division multiplex transmission line in the two frame delay times by which the pulse frames of the transmission directions are each time the same time channel transmit time division multiplex lines SMLl ... SMLN opposite within the respective pulse frame is used. 30 over the pulse frame of the receive time division multiplex

The individual intermediate lines ZO / Z6 ... Z3 / Z3 'lines EMLl ... iJMLiV are temporally erased. According to the input side with the individual reception time stipulation of the drawing unspecified in the recirculating address memories Ul ... multiplex lines EMLl ... EMLN via the crosspoint addresses currently stored in the UN , each by the coupling lines currently involved in the crossover point of the lines concerned 35 point switches, the relevant coupling-enclosing circle indicated coupling point switching point switches can each be periodically connected in the correct time channel; such a crosspoint switch is closed in pulses.

As can be seen from the drawing, connections each periodically serve the circulating address memory Ul ... UN and successive time fans transferrable, 40 the decoders DEl ... DEN connected downstream of them, which are controlled by the the relevant connections on the DSl ... DSN also for the control of further th time channels within the pulse frame of these receiving time division multiplexing switches, which are also given in the relevant receiving time division multiplex line, which are also unspecified. Output receive time division multiplex line EMLl ... EMLN or. on the side are the intermediate lines Z0 / Z6 ... Z3 / Z3 '45 transmission time division multiplex line SMLl ... ÄMLiV each with "the transmission time division multiplex lines SMLl ... can be connected to a further intermediate line, the SMLA ^ via coupling also unspecified in turn can be connected via further point switches, which are also point switches in the drawing; such a coupling point switch with a switch, not specified in detail, can be connected within the framework of intermediate line pairs routed over it, such as the intermediate line connections in those each periodically 50 pairs of ZVfZV, the pairs of congested time slots transferable, table caches to the per se known indie by the connection in question on the formation caching for storage times, the respective transmission time division multiplex line allocated each greater than twice the pulse frame time channels within the pulse frame of this transmission delay time, contains en. The control of the time multiplexer is given. The four-wire 55 mentioned further crosspoint switch can be done with moderate operation of the time division multiplex lines according to a correspondingly not shown in the drawing, a pair of intermediate lines in further address recirculation memory, which includes such a connection, as is the output side directly a first decoder DEV and is known. via a delay element whose delay time

To control those crosspoint switches, 60 is again equal to the pulse frame delay time which is connected downstream to one and the same receive time division multiplex and a second decoder DSV; the line lie, and those crosspoint switches, outputs of these decoders DEV, DSV then lead in the manner indicated in the drawing on the associated transmit time division multiplex line, only one common address circulation control inputs of the individual further crosspoint memories is provided, so for the control of the an 65 switch.

the reception multiplex line EMLl cherish ligand LAD For the preparation of compounds collector is located in pelpunktschalter and at the transmitting time division the connecting coupling line Smll shown in the drawing crosspoint switch of the field now a special intermediate line pair SV single

7 8

joined, the two intermediate lines SF1, SF2 of the binding participant receiving-side allocated time via crosspoint switches IM1, IM2; ...; NkIl, channel is the crosspoint in question NkIl with the receive time division multiplex lines IsMLI switch IMl, ... JVMl, via which the relevant ... EMLN and via crosspoint switch 21fcl, HArI; Receive time division multiplex line EMLl, ...; EMLN ...; HkN, HkN can be connected to the transmission time division multiplex line 5 with said one intermediate line 5Fl of the betungen SMLl ... SMLN . Special intermediate line pairs SF can be connected, 'for controlling the crosspoint switches IM1, IM2; activated and thus closed in pulses, so ...; JVMl, JVM2, each one receiving that the currently on the relevant receiving-time-time division multiplex line EMLl ... EMLN can be connected to one of the multiplex lines transmitted by said special intermediate lines (SF1), HkI originating from the first collective connection subscriber and for controlling the crosspoint switches 21kl, PCM word is transferred to the shift register ZZ ; ...; 21 kN, 11 kN, over which each is associated. At the same time, a PCM word previously stored in the shifting transmit time division multiplex line SMLI ... SMLN with register ZZ is deleted, which can happen to such a special intermediate line (SF2) by being able to connect at the same time as the one in the drawing 15 control of the crosspoint circuitry in question in each case the same common switch / Ml ... ÖM1 provided for the blocking input of the address circulation memory Ul ... UN , the blocking element SG leading line s is activated, so in the manner already indicated via the immediately after that the blocking element SG is blocked and thus the circulating decoder DE1 ... DEN or via the path of the PCM word circulating memory is interrupted in each case via a delay element Vtv . The newly aufgenomteten into the shift register ZZ decoder DSI ... DSN each, the remaining mene PCM word occurs now in the time slots of the following at the respective receive time-division multiplex lines timeslots in serial display on EMLl. .. EMLN or transmit time division multiplex line output of the shift register ZZ , namely so SMLI ... SMLN lying crosspoint switch until in the next time slot of the first considered, control. 25 to the first hunt group subscriber receiving

In the one time channel allocated to establish a collective connection, the next connection subscriber originating from this on the receiving side with the said first collective first collective connection subscriber and at the transmission end with the PCM word entered into the shift register ZZ is called the second collective connection subscriber. From the output of the shift register ZZ and connecting intermediate line SF1 of the special 30 thus from the output of the PCM word circulation memory intermediate line pair SV , a PCM word circulation is inserted from the first current memory that is stored there. This PCM memory originating from the PCM word circulation group connection subscriber is formed in the word shown in the drawing for the individual second group connection circuit arrangement by the series subscribers by adding an OR element OG and a sliding element to the time compartments of this circuit. 35 second collective connection participants on the transmission side register ZZ of the length of a PCM word, allocated time channels the respective output in question via a blocking element SG and the crosspoint switch 11 kl .. .WkN, via which the second input of the OR element OG to the named an intermediate line SFl of the special shift register input is fed back. One of an intermediate line pair with the relevant receive time division multiplex lines EML1 ... 4 ° transmit time division multiplex lines SMLI ... SMLN can be linked to EMLN via the crosspoint in question, controlled and thus pulsed IM1 ... JVMl be closed in a specific time slot.

PCM word entered into shift register ZZ To the time slots of the individual at the moment

occurs with a time delay in serial form on the considered hunt group involved in the second

Output of the shift register ZZ and is sent to 45 collective connection participants on the receiving side.

the time channels that are immediately divided into the shift register ZZ are the respective

so that there is also crosspoint switch IM2 ... NkIl, over in the following time ends

fan out in serial form at the shift register output the relevant receive time division multiplex

occurs. lines EMLl ... EMLN with the second intermediate

Into the other intermediate line SF2 of the special 5th line SF2 of the special intermediate line pair

Intermediate line pair SV, which can be connected to produce an SV , controlled and thus pulse

Collective connection on the receiving side with the second closed, so that the said

Collective connection participants and originating with second collective connection participants on the transmission side

PCM words one after the other to the non-linear linear

bind, the series connection of a non-linear 55 code converter NL is achieved. Here the PCM

Linear code converter NL, one a "linearized" words each digitally linearized, ie for example

Caching PCM word in parallel representation - from a non-linear 8-bit code to a linear one

the register R, a binary adder ADD and a 12-bit code. That with such a

Code back converter LN inserted, with the 12-bit code received for the setting is then in parallel

second input of the binary adder ADD another 60 representation of the non-linear linear code

PCM word register RR leads, whose input is taken over with converter following register R and

connected to the output of the binary adder ADD to one input of the binary adder ADD

is. retransmit. That at the output of the binary adder

The sum word obtained above in its circuit ADD is transmitted via the PCM

Structure of the explained circuit arrangement for the production of 65 word register RR the second input of the binary

A collective connection then works in the ADD supplied in the adder. This achieves

in the following manner, which will be explained in more detail: that the successively via the PCM word register R

To the time slots of the first collective verifier one input of the binary adder ADD is supplied.

th PCM words of the second hunt group subscribers are added to one another. The sum word obtained in this way is finally converted back into the non-linear 8-bit code in the code convertor LN. In the time channel assigned on the transmission side to the first collective connection participant in the collective connection under consideration, the relevant crosspoint switch 21 kl ... 2IkN, via which the second intermediate line SV2 of the particular intermediate line pair SV with the relevant transmission

10

Time division multiplex line SMLl ... SMLN is connectable, controlled and thus closed in pulses, so that the PCM sum word formed from the PCM words of the individual second collective connection subscribers is transmitted on to the first collective connection subscriber via the relevant transmit time multiplex line.

The processes described are then repeated in a corresponding manner for the others ίο from the various collective liaison officers. supplied PCM words ..

1 sheet of drawings

Claims (2)

1 2 called pulse frame delay time, a two-patent claims: the decoder (DSl ... DSN) is connected downstream, the outputs of which to the control inputs of the first- 1. Circuit arrangement for the production of said crosspoint switches (IkIl, Ikl2; ...; Collective connections in each case between a first 5 NkIl, Nk 12) or the second-mentioned coupling subscriber and a plurality of second sub-point switches (21H, 11kl; ...; 2IkN, UkN) users in a PCM telephone exchange lead, place, characterized in that in which between the receive time division multiplex lines (EMLl .. .EMLN) and the transmission time io
multiplex lines (SMLl ... SMLN) lying Connection switching network, which is different in telecommunications, in particular telephone switching measured pairs of supply systems in their storage time, there is often the requirement, in addition to mutually complementary buffers (ZO / connections between two subscribers Z6; Z3 / Z3 ') containing intermediate line pairs 15 also connections between more than two partial and / or pairs of static To be able to establish intermediate storage. Link pairs containing such connections (ZVJZV) are generally proven as conference connections, and a special link pair (SV) is identified. In such connections, the subscribers involved in one of the subscribers involved in the connection on the receiving side are often given equal rights among the first collective connection subscriber and others. However, it can also be desirable on the transmit side with the second collective connection, connections between a first subscriber subscriber connectable intermediate line (SVl) on the one hand and a plurality of second subscribers connected to one another not a PCM word circulating memory (ZZ-SG-OG) on the other hand is added and in its other, to be able to bring stands on the receiving side. Such connections, with the second collective connection participants 25, which are referred to below as collective connections and on the transmission side with the first collective connection, are, for. B. in telecommunication systems of Ordnungsdung participants connectable intermediate line and disaster services, such as police, fire brigade, (SVl) the series connection of a non-linear medical service, technical relief organization, or in mili-linear code converter (NL), a PCM-Wort-R- tärischen telecommunication systems desired to register (R), one with its second input over 3 °, if necessary from one point in the shortest possible time, another PCM Woit register (RR) at its binary adder (ADD ) Message to be able to pass, and a code reverse converter (LN) is inserted. In conventional telephone exchanges 2. Circuit arrangement according to claim 1, there is a transmission of time-continuous characterized in that in a switching 35 analog signals in spatially separated place in which the pulse frames of all transmission channels take place. Newer telephone time division multiplexed lines synchronizing systems with one another do not make use of the space-multiplexing and the pulse frames of all the reception-time principle, but of the time-division multiplex principle, multiplex lines with the help of in these lines with temporally discontinuous analog signals inserted Term elements between each other in such a way 40 will carry. Lately get syncronized next to it are that the pulse frame of the sending telephone exchanges meaning, Time division multiplex lines one opposite the pulse in which a transmission of (also temporally frame of the receive time division multiplex lines discontinuous) digital signals takes place with the different, each with a certain system-related advantages, such as time bundling desired mean total time interval 45 ability, insensitivity to disturbances in between the receiving and transmitting forms of crosstalk and noise, inter alia, respectively assigned time channels are defined. In this period of delay is of particular importance (Pulse frame delay time) in relation to the pulse code modulation (PCM), have the same time slot, whereby for the transmission at the periodically successive time of Message signals via one with a 50 score the amplitude instantaneous values of the speech such Transfer signals connected to the exchange are mapped by binary words, which then transmission line can be transmitted in both transmission directions. because the same time channel within the respective In switching systems in which the voice Pulse frame is used to control such information with the help of analog signals transmitted crosspoint switches (Ifcll, IkU; ...; NkIl, 55, conference connections can be made in a simple Nkl2), via each of which a receive-time manner is established by the Connection lines multiplex line (EMLl ... EMLN) can be connected to one of the subscribers concerned directly or an interim line (SVl) of such a special intermediate also via intermediate storage, so interconnecting line pairs (SV) can be connected, and for a mixture of all voice signals to control such crosspoint switches (21 k I, 60 participants involved in a conference connection - HkI; ...; 2IkN, HkN), via which each is targeted. In the associated transmit time division multiplex line (SMLl ... switching systems) with such an intermediate line (SV2) with such an intermediate line (SV2) there is a general non-linear modulation characteristic that can be connected, in each case only one common establishment of conference connections under a shared address memory (Ul ... UN) is provided 65 such a mixture of the different speech signals, the output side directly a first decoder. not easily possible. To carry out (DEl ... DEN) and via a delay element conference calls in a PCM telecommunication system (Vtv), the delay time of which is the same as that from the CCITT documents WP33 / XV-No.6-E