CH649665A5 - INTEGRATED ELECTION AND TRANSMISSION NETWORK. - Google Patents

Description

The invention relates to an integrated dialing and transmission network according to the preamble of patent claim 1.

In a telecommunications network, the same dialing modules are used to produce dialers that are easy to use and that allow the capacity of the network to be expanded during normal operation. The network can only be expanded satisfactorily with dialing modules if a module is structured from the beginning

that its properties can remain unchanged regardless of the network capacity. Dialing modules which are contained in frequency division multiplex telephone networks and which only make spatial switching have been known for a long time. Analog dialing modules of this type form stages which are connected to one another by means of intermediate line groups which, in order to expand the network, are modified by adding further modules. However, dialing modules included in time-division multiplex systems are more difficult to manufacture because normally both spatial and temporal channel switching takes place in the transmission of information between subscriber lines which are connected to the time-division multiplexing dialing and transmission network. In principle, the same modules can only be generated if a module performs both temporal and spatial switching.

It is known to use time-division multiplex circuits, the switching principles of which are referred to by terms such as “time-space-time” or “time-space-space-time” or “space-time-space”, which designation clearly shows in the order in which information coming into the dialing system in time-division multiplex form is transmitted between time stages in order to carry out temporal switching and between spatial stages in order to carry out spatial switching.

A known module selector for time-division multiplex digital information, which is described in "Colloque International de Commutation Electronic, Paris 1966, pages 513-520", mainly contains identical modules, all of which are between a number of time-division multiplex input lines of a number of time-multip through ex-output lines, the time-division format, ie the number of time slots per frame, which is different for different line types, and the spatial interconnections within a module are achieved with the aid of an internal multiplex format which has at least as many time slots as there are information channels which are received to the module. Time-division multiplex lines, which are arranged between the modules, have the same function as the mentioned intermediate line groups, each of which is formed by a single time division line, whose time division format guarantees that connections are made without blocking.

DE-OS 25 46 205 describes a “time-time” switching principle which is achieved with the aid of input modules which are connected to output modules by a single common time-multiplex line. Thanks to this common time-division multiplex line, a space step can be dispensed with, and compared to the first-mentioned, known module switch, improved handling options are achieved. If a module fault occurs, the faulty module is replaced by a faultless one,

without affecting the switching capacity of the other modules. When the network is expanded, further input and output modules are connected to the common time-division multiplex line, which, if necessary, can also be done during operation.

In addition to the above-mentioned considerations regarding the subdivision of the voter into modules, the way in which the connections are made by the voter, i.e. the control of the voter, an important role for the reliability and capacity of the telephone network. It is known, for example from the publications mentioned above, to control a digital time-division multiplex selector with the aid of a central computer which receives control signals from the subscriber equipment or from a remote concentrator which indicate an order for the establishment of a connection. On the basis of the control signals mentioned, the computer finds the addresses, indices, time slots, time-division multiplex line numbers etc. which depend on

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gig of the electoral principle chosen, to the time and space levels and the modules of the voter must be transferred so that the commanded connection is established. In the oldest time division multiplex systems, a separate control transmission network was arranged for the connection of the computer. In modern and improved time-multiplex systems, for example the digital “time-space-time” system, which is described in DE-PS 23 06 301, one aims at relieving the strain on the computer, while at the same time the aforementioned control transmission network is included as far as possible in the appropriate time-division multiplex information transmission system.

The invention has for its object to provide an easy-to-use and expandable IST network (integrated dialing and transmission network), the non-blocking "space-time" selector contains the same designed dialing modules, which in a decentralized manner without a special Control information transmission system and can be completely controlled without a centrally located control unit or computer. This object is achieved with an integrated dialing and transmission network according to claim 1. The actual network created with the invention is explained in detail below on the basis of exemplary embodiments in conjunction with the drawing. Show it:

Fig. 1 is a block diagram of the actual network;

2 shows a synchronizing clock device;

3 shows a time stage of a dialing module;

4 shows three signal receiving units of a dialing module; and

5 and 6 each a signal conversion unit of a selector module.

FIG. 1 shows n line groups LG1-LGn, between which telephone connections are established with the aid of n line modules LM1-LMn and a digital selector S, which contains at least n2-n dialing modules SM.

Each management group, e.g. LG1, a line module LM1 is assigned, which comprises a transmitter T1 and a receiver R1, which, via a time-division multiplex line Lai or Lbl, with dialing modules SMl / 1-SMl / n, which form lines in FIG. 1 or with dialing modules SM 1 / 1 to SMn / 1, which form columns in FIG. 1, are connected. The time-division multiplex lines transmit digital call and signal information in time-division multiplex form from the line modules to the digital selector S and vice versa.

1 is simplified in order to make the description clearer, and only those power supplies that are required to explain the invention are shown. The time-division multiplex synchronization of the ACTUAL network, for example, is only indicated by the clock input CL, which is present on each dialing module, so that the receivers Rl-Rn receive the information coming from the voter S under frame synchronism. A frame synchronization is carried out within each line module, so that the information which is transmitted from the transmitters Tl-Tn to the selector S is also frame-synchronous. In practice, the synchronization conditions are not so ideal, but due to the fact that in larger networks each line module has its own clock generator, phase shifts and so-called plesiochronous information transmissions to the selector S occur. However, it is known to use, for example, the fastest clock at the moment in order to synchronize the information coming to the selector S and to install phase compensation circuits in the line modules and to use the so-called “pulse buffering” arrangements in order to avoid information losses. The following description therefore assumes

that the line modules, time-division multiplex lines and dialing modules represent an ideally synchronized system.

As is known, a time-division multiplex format is mainly determined by its frame frequency of 8 kHz, for example, and also by the number of time slots per frame period. For example, there may be m time slot groups, each of which has 32 time slots. An information unit is transmitted in each time slot, which in a digital system consists of a digital word composed of a number of bits, e.g. eight. Most time slots in a frame period are used for information transmission, but some time slots, e.g. two within a group of 32 time slots are reserved for synchronization and signal transmission. In the actual network described here, a time slot is not required for the synchronization in every frame, but rather so-called idle signals, which indicate that no signal transmission takes place within a given time slot group, are also used as synchronization signals, so that they are practical the abovementioned few time slots can be used for digital signals and signal messages, which are described in detail below and which each relate to the transmission channels belonging to a 32-time slot group, it being possible for the voice transmission and partly used for data transmission.

It is known for IST networks to use both parallel and serial information transmission and to vary between time-division multiplex formats with different multiples of 32 time slots. It is assumed for the network, as shown in FIG. 1, that the same format and transmission principle is used for the time-division multiplex lines La, Lb. Known parallel-series or serial-parallel converters are, if necessary, present in the line and dialing modules of the network and are not shown in FIG. 1. In addition, analog / digital and digital / analog converters can be arranged either in the subscriber equipment or in the line modules, but these are not shown since they are not part of the invention. The same applies to known concentrators which can be contained in the line modules and which are required if a line group has a larger number of subscriber equipment than time slots in the time-division multiplex format chosen for the time-division multiplex lines.

1 shows that each line module is provided with at least one control unit CU, which is assigned to a line subgroup. Each control unit controls the assignment of a number of time slots on the associated time-division multiplex line pair Lax / Lbx; for example one of the aforementioned m 32 time slot groups for the transmission of the call information of the subgroup and the associated signal information to and from the selector S. In FIG. 1 a system is shown which is designed such that only one control unit is arranged in each line module with Exception of the line module LM2, which contains m control units CU2, l-CU2, m, so that the line group LG2 consequently has m subgroups LSG2, l-LSG2, m. The named m control units each have a 32 time slot group, i.e. together they use all the time slots of the time division multiplex line pair La2 / Lb2. The line module LM2 contains a concentrator (not shown in FIG. 1) if one of the line subgroups mentioned has more than 30 subscriber lines, because with the aid of the associated control unit, a maximum of 30 subscriber equipment can be connected simultaneously in time-division multiplex form, for example to the line La2.

A control unit included with a line module is designed to make connections

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controls within their own leadership subgroup. If the line module has only one control unit, then the selector need not necessarily contain a selector module which switches between the time slots on the time-division multiplex line pair which is connected to the line module, but the line module can in this case contain an internal selector with which internal subgroup connections are made. In addition, if the subscriber equipment of this subgroup each has a separate line to the line module, then the internal selector represents a room level. The advantage of having an internal selector is that the internal call connections of the subgroup on the associated time-division multiplex line pair are neither for call information nor for Signal information require time slots. In this way you get a larger switching capacity. On the other hand, since the analog conversation or message information of the subgroup is anyway converted into time-division multiplexed digital information, which is switched through by the selector S to other line modules, and since the internal selector that is required in the line module can usually not be carried out more easily than a selector module, the greatest possible uniformity in an ACTUAL network is achieved if the selector n2 contains the same selector modules. Dialing modules, e.g. SM2 / 2, which are connected to the associated line module LM2 via a time-division multiplex line pair La2 / Lb2, must always be provided, however, if the line modules contain more than one control unit, because connections between subgroups belonging to the same line group, e.g. between LSG2,1 and LSG2, n, can only be made via selector S. In the selector shown in Fig. 1, the modules SM1 / 1, SMn-n / n-1 and SMn / n have been omitted, and it is assumed that the line modules LM1, LMn-1 and LMn contain internal selectors that do not are shown.

A control unit entering a line module is also designed in such a way that, together with control units from other subgroups, it controls the selector when external connections are established between its own subgroup and the other subgroups, using the time slots mentioned above, which are provided for signal information. This means that the entire tax intelligence of the IST network is distributed among the decentralized control units. Each module of the selector has a time stage TS and a signal handling logic circuit SL, which are completely passive and without self-intelligence. Except for the clock generator for synchronization, each module is exclusively connected to one of the transmitters Tl-Tn on the input side and to one of the receivers R-Rn on the output side. The selector S is therefore not provided with an intelligent central control unit. The decentralized control units of the line modules get their intelligence e.g. with the help of stored programs. The control units controlled by means of stored programs need not be described in detail in connection with the invention. When the external connections are made, the control units of the new IST network have the following important functions, which relate to signaling either between control units or between a control unit and the voter and which are carried out with the aid of computers known per se, for example the Motorola M6800 microcomputer suitably programmed.

The signal transmission between two control units aims to exchange signal messages that are coded, for example, according to a signal system that has the CCITT designation X-25. The structure of the

Signal systems need not be described in detail in order for the invention to be understood. It is sufficient to state that each message unit is coded in such a way that the received control unit knows when the entire unit consisting of an individual number of digital words has been received. In addition, the structure of the signal system is such that an exchange of messages in the two transmission directions in both control units leads to the fact that they know that a communication link should not be established, established or terminated by the voter, with the aid of addresses and time slots , which were obtained due to a completed signal exchange between two control units. In the proposed IST network, the messages of the signal system are transmitted during a time slot which is provided for signal information and is referred to below as a time slot. For example, in order to transmit a signal message unit from the control unit CU2, m to the control unit CUI, the dialing module SM2 / 1 must perform a time switching from the time slot 16 into the 32 time slot group, which is assigned to the control unit CU2, m, to the time slot 16 within the 32 Time slot group, which is assigned to the control unit CUI, which is a so-called 16-16 circuit. The operation of the dialer will be described later. Before the control unit CU2, m starts transmitting the mentioned message unit, it must know that neither the dialing module SM2 / 1 on behalf of e.g. the control unit CU2.1 must also carry out one of the selection modules Sm> 2/1 on behalf of one of the control units CU> 2 any 16-16 connection in order to transmit another message to the control unit CUI.

In order to establish a reliable communication link, the control unit CU2, m first transmits a call signal, which is addressed to the control unit CUI, during the second of its time slots, which is provided for signal information and is referred to below as the time slot. The address to the control unit CUI also defines the only dialing module SM2 / 1, via which the call signal must be transmitted. A control unit transmits the call signals individually, which means that the transmission of an intended message unit must have ended before this control unit transmits a further call signal.

On the basis of call signals received by a control unit during the time slot 0 assigned to it, this control unit sends one response signal after the other during its time slot 0, which means that the transmission of the intended message unit by means of the corresponding call signal must be ended before this control unit sends a new answer signal that belongs to another call signal. In the assumed signaling example, the control unit CUI sends a response signal that is addressed to the control unit CU2, m in accordance with the “one by one” rule mentioned. The address to the control unit CU2, m is also determined by the only dialing module SM 1/2, via which the response signal must be transmitted.

The aforementioned "one by one" rule, which relates to calls and answers, enables the following confirmation operations: A call signal is repeated continuously until the associated answer signal has been received. When the received call signal ceases, the called control unit knows that the answer signal has arrived at the calling control unit. A response signal is also repeated at least until at least the first word of the message unit has been received.

When the answer signal goes out, the calling control unit knows that the 16-16 connection mentioned is working reliably.

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However, maximum time limits for the duration of the transmission of the call and answer signals are introduced. If no response signal or message word has been received after a maximum period of time, the respectively waiting control unit generates an alarm signal.

If the called control unit, in the example the control unit CUI, has received the entire message unit during its time slot 16, then it sends a signal to the calling control unit, the control unit CU2, m in the example, during the time slot 0, the content of which indicates that the message unit has either been received correctly or has to be sent again. The "correctly received" and "resend" signals mentioned are modified response signals, both of which have the property that they do not have to contain the address of the called control unit, because, based on the "one by one" rule, the calling control unit knows that this response signal can only come from the called control unit. The aforementioned operating principle is also used to reliably complete the transmission of the message unit. The called control unit continuously repeats the “correctly received” signal mentioned. The calling control unit responds by continuously sending a “correctly received” signal to the called control unit. When the called control unit receives the "correctly received" signal, it stops sending the "correctly received" signal. If the calling control unit no longer receives the "correctly received" signal, it also stops sending.

The result of the signaling process described is that a single message unit has been reliably transmitted in one traffic direction. To achieve an exchange of messages, an equivalent process is repeated in the other traffic direction, with the two control units swapping their roles.

In addition to the "one by one" rule mentioned, there is a first priority rule according to which a control unit must answer received call signals before it starts or continues an exchange of messages as the calling control unit. This first priority rule prevents too many unanswered call signals from accumulating. The mentioned maximum period of time, which is valid for call signals, is determined in view of the fact that a control unit can be called by all other control units of the ACTUAL network during the same frame period. Waiting problems arise not only in the called control unit, but also in the associated dialing modules and the relevant time-division multiplex line for transmitting the call signals from the dialer to the called control unit. The types of answer signals mentioned are also involved in the queuing of the signals which are addressed to a control unit, but due to the "one by one" rule there is at most one signal of the answer type together with a number of call signals. The solution of how to overcome the problem of standing in line will be described later.

During frame periods, which are neither occupied by the fact that they transmit the previously explained signals for calling or answering, nor contain signals for setting up or clearing down connections, as will be explained below, the time slots 0 on the time-division multiplex lines of the IST network become so used to transmit the idle signals already mentioned.

The aim of the signal transmission between the control units and the voter is to set up or clear down the 16-16 connections between the control units and the ml, tl-m2, t2 connections for message transmission between the subscriber equipment. This means that the voter switches through times from time slot 16, which is assigned to the sending control unit, to time slot 16, which is assigned to the receiving control unit, and from a relevant time slot tl belonging to the 32 time slot group ml, during which receives the message information in question by the voter, performs the time slot t2 belonging to a relevant 32 time slot group m2 during which the voter transmits the message information in question.

From the explanation of the passive function of the dialer it can be seen that the call signals mentioned are used to establish the 16-16 connection mentioned. To establish a ml, tl-ml, t2 connection, a control unit, e.g. CU2,1, whose nl number is 2, a connection setup signal during the time slot 0 assigned to it, which simultaneously defines the 32 time slot group ml = 1 of the control unit. The connection setup signal contains both a setup code and an n2 number, e.g. n2 = 2 in order to address the only dialing module in question, for example the dialing module SM2 / 2. The connection setup signal also contains the timeslots tl and t2 mentioned, as well as a m2 number, e.g. m2 = 2 to designate the receiving party and its 32-timeslot group, which contains timeslot t2. According to the example, the connection setup signal denotes a one-way communication connection from a subscriber equipment of the subgroup LGS2.1 (n 1 = 2, m2 = 1) to a subscriber equipment of the subgroup LGS2.2 (n2 = 2, m2 = 2). The signal-handling logic of the receive selector module SM2 / 2 converts the connection setup signal into operational signals with which the time stage of this selector module establishes the intended switching. Because of its n2 number, the connection setup signal does not influence any other time stage in another dialing module. In this elegant way, the spatial switching of the voter is carried out without the usual room levels and special room switching signals.

In order to terminate an mI, tl-m2, t2 connection, a control unit sends a connection clearing signal during its associated time slot 0, which is identified by a clearing code and which differs from the connection setup signal only in that a tl time slot specification is unnecessary. The breakdown of a 16-16 connection is signaled to the voter either by means of a “correctly received” confirmation signal or by means of a breakdown signal which contains t2 = 16.

The signals mentioned, which are generated by the control units, contain, like the message units of the signal system, a code and the variables in question, such as the addresses mentioned with the aid of the numbers nl, n2 and ml, m2 and the tl, t2 time slots . In a larger system with, for example, eight line modules, each of which contains 32 control units, in order to be able to choose between approximately 8000 subscriber equipment in a non-blocking manner and without the need to install concentrators, the signals cannot be defined with just a digital word of eight bits. So-called multiple frames are introduced in IST time division multiplex systems in order to transmit signals of this type which contain several words, these multiple frames having a constant or varying number of frame periods. In connection with the explanation of the mode of operation of the voter, the multi-frame technique, which is known per se, is also discussed to the extent necessary.

The principles that apply to the passive operation of a signal-handling logic circuit in one of the selection modules of the new ACTUAL network are described below

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be valid. The logic circuit comprises receiving units which only react to the assigned n2 number address and the present signal code, and converter units which convert signals arriving at the dialing module into the mentioned operational signals and into signals which go away from the dialing module. According to a simple second priority rule, the converter units for processing the call signals decide which of the call signals which arrive simultaneously and are addressed to the same reception control unit into an operation signal in order to establish the corresponding 16-16 connection to this control unit and is converted into a call signal , which starts from this control unit. The converter units for handling signals of the types of answer mentioned have a simpler structure than the call converter units. Because of the "one by one" rule, it is sufficient if the receiving control unit only receives the answer code, while a converted call signal must indicate from which control unit in which line module the call comes. The handling of the response signals does not require any priority rule.

It is achieved that a receiving control unit, e.g. CU2.2, which receives signals from selector modules SM1 / 2-SMn / 2, which are shown in a column in FIG. 1, can be called at the same time via all selector modules of the corresponding column (n2 = 2) and a response via one the dialing modules of the column can be received. If the receiving switching unit is connected to the corresponding column of the selector modules by means of a common time-division multiplex line, as is the case in the example of FIG. 1 through line Lb2, then a multiple frame must be defined with regard to time slot 0 of the receiving control unit. Within this multiple framework, e.g. each of the dialing modules of the column and consequently the calling line modules is assigned an nl frame period for call signal transmission and a frame period which is common to all dialing modules in the column for the transmission of the signals of the response type. The common frame period mentioned is not necessary if the call and answer converter units are modified in such a way

that a response signal prevents a call signal. Each dialing module then sends only one signal during a time slot 0, either an answer signal or a call signal. In addition, if a separate time-division multiplex line is provided for each dial module to transmit information to the corresponding line module, then multi-framing for signals originating from the dialer is avoided. In an ACTUAL network which is modified by the separate lines, as is explained in connection with FIG. 6, a faster signaling process is achieved with shorter maximum time periods than in the system according to FIG. 1 with said common lines Lb.

FIG. 2 shows the clock device CL common to the voter, which was mentioned at the beginning of the description, in order to generate a time-division multiplex format with 32 time slot groups, each of which has 32 time slots. A frame period of f = 125 jis comprises 32 x 32 time slots, so that the duration of each time slot p is approximately 122 ns. The time slots are designated with two digits 0 <m <31-0 <t <31. At time slot 0-0, a frame period begins, precedes time slot 0-1 and follows the last time slot 31-31 of the previous frame. The clock determines the time slots based on pulse chains as shown in Figure 2, which are generated in a known manner, e.g. with the help of a shift register. It is assumed here that the ACTUAL network works according to the parallel transmission principle, which is why no division into bits is made within the individual time slots. The clock device is provided with an output <D which, according to FIG. 2, emits a pulse chain which has a pulse and an interval within each time slot. The pulses are required to avoid writing and reading processes coming together in a manner known per se, which will be described later in connection with the time connections. The clock device is controlled by an oscillator OS, the fundamental frequency 23 of which + 5 + 5 + 1 kHz «16 MHz.

FIG. 3 shows a time stage known per se, with which the time switching operations are carried out within the 32 × 32 time division multiplex format. The time stage mainly contains an information store IM and an address store AM. The write inputs of the information memory are connected via an AND gate Gl and via 32x31 AND gates G2 to the time-division multiplex lines La, nl for incoming information. During the (D-pulses of a frame, message and message information arriving during time slots m-1 to m-31 are written into the allocated locations of the information store. Signals arriving during time slots m-0 are, however, stored in the information store Thus, the message and message information which is transmitted on the line La, nl is registered in all the dialing modules which are connected to this line, these dialing modules representing one line in Fig. 1. The read outputs of the address memory AM are connected to a time switching decoder TDEC via 32x31 AND gates G3, the decoder addressing the information memory during the (fr interval for reading out on the line Lb, -nl / n2 which emanates from the dialing module. The identification n1 or n2 1 determines the transmitter Tnl or receiver Rn2 assigned to the time stage.

In Fig. 3 it is assumed that the time switching decoder receives the addresses 31-1 and 0-16 during the time slots 0-31 and 31-16 respectively, while in the remaining time slots the addresses m-0 which are received by the information store are transmitted. The message information ki, which was registered in the information memory during the time slot 31-1, is consequently delivered to the line Lb, nl / n2 during the time slot 0-31, and the message information mi registered during the time slot 0-16 is sent to the time slot 31 -16, but the rest of the information registered in the information store is not transferred to the outgoing line. The address memory AM is connected with its write inputs via an operational decoder ODEC and via AND gates G4, which are activated during the (D pulses), to operational inputs 01 and 02 of the time stage.

4 shows signal-receiving units SRU-C, SRU-A and SRU-E, which are contained in the signal-handling logic circuit of a selector module SMnl / n2 and which receive call, answer and connection setup signals which are in a signal register SREG are saved. For the connection clearing signals mentioned or the signals of the response type, the logic circuit has further receiving units corresponding to the units SRU-E and SRU-A, which are therefore not particularly shown in FIG. 4.

The signal register SREG registers with the help of an OR gate G5 and an AND gate G6 during the time slots m-0 idle signals, ringing signals, answer signals and connection setup and disconnection signals that come from the line La, nl. Each call or answer signal consists of two digital words, the first of which contains an n2 number in addition to the corresponding code C or A to address the dialing module SMnl / n2, and of which the second digital word contains an m2 number to identify one of the receiving ones Control units that are connected to this dialing module. A connection establishment signal

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consists of four digital words, of which the first contains, in addition to a connection establishment code E, an n2 number for addressing the dialing module SMnl / n2 and the second, third and fourth the m2, t2 and tl connection setup information already explained.

The signal-receiving units each contain a code register CREG, AREG or EREG in order to constantly store the C-n2, A-n2 or E-n2 information mentioned. In addition, each signal-receiving unit contains a comparator CC, AC or EC, of which one input is connected to the associated code register CREG, AREG or EREG and the second input is connected to the signal register SREG. The comparator outputs are each connected to the 32 AND gates G7, which are activated during an assigned test pulse, according to FIG. 4 the time slots 0-20, 1-20 ... 31-20, and their outputs each with the first shift stage is connected by shift registers SH, which are clocked by means of the clock pulses 0-0.1-0 ... 31-0. Depending on the number of words of the signals, the shift registers contain two or four shift stages. For example, the second shift stages between the second and the third «fr pulse activated, after the test pulse during which the connected gate G7 is activated. The second, third and fourth shift stages of the shift register SH are each connected to a first input of an AND gate G8, the second input of which is connected to the signal register SREG and the third input of which is activated together with the gate G7 which is connected to the associated shift register is. The outputs of the gates G8 form the outputs CM2, AM2, EM2, ET2 and ETI, from which the above-mentioned m2, t2 and tl numbers are sent out. The response signal receiving unit SRU-A is equipped with an output AM2, while the call and connection set-up signals receiving units SRU-C and SRU-E are provided with separate outputs CM2 and EM2, ET2, ETI, which are each assigned to a control unit is defined by means of a ml number. The receiver unit SRU-E for connection setup signals is also provided with outputs M, which is activated by means of AND gate G9 during a first operation pulse that occurs after a corresponding test pulse and, according to FIG. 4, is formed by the m30 pulse that is associated with the Activation of the fourth shift stage of the associated shift register meets.

FIG. 5 shows a converter unit for connection setup signals, which has first operation registers OREG1 and AND gates G10. The first operation registers are connected to the outputs EM2, ET2 and ETI of the receiving unit SRU-E, but also have register sections in order to constantly store the ml number of the corresponding transmission control unit. The gates G10, which are assigned to the corresponding ml number, have their inputs connected to the outputs M of the receiving unit SRU-E and to the first operation registers OREG1 and their outputs lead to the operation inputs 01 and 02 of the time stage in such a way that the m 1-tl operation information is written into memory locations of the address memory AM of the second stage during the O pulse of the first operation pulse, the addresses of the locations being determined by the m2-t2 operation information.

FIG. 6 shows a combined converter unit for call and answer signals. The m2 numbers, which are received as response signals from the unit SRU-A receiving the response signals through the output AM2, are decoded with the aid of a response decoder ADEC and set bistable flip-flops FF to “1”. A flip-flop set to “1” indicates that the associated m2 control unit is to receive a response signal and activates the first input of an AND gate Gli, which is assigned to the same m2 number, and its second input during the time slot 0 from the same m2 Number is activated and its third input is connected to a response register REG-A, which constantly stores a response code A. The "0" position of the flip-flop is achieved with the aid of an erase pulse which is assigned to the corresponding m2 number; 10 pulses according to FIG. 6. The outputs of the gates Gl 1 are routed to the line Lb, nl / n2 coming from the selection module.

The m2 numbers, which are received by the unit SRU-C receiving the signals through the aforementioned outputs CM2, are decoded with the aid of call decoders CDEC, each of which is assigned a ml number for transmission control units. The outputs of the call decoders are connected to priority devices PD-Obis PD-31, which are each assigned a m2 number for reception control units. Each priority device selects one of the control units according to the second priority rule mentioned above, which calls the associated receive control unit during a frame. Each priority device is provided with outputs CM1, each of which is assigned a ml number, and of which consequently a maximum of one between two successive priority pulses, which occur after the test pulse of the second slot group m = 31, is activated. 6, 31-30 pulses form the priority pulses. The outputs CM1 are each connected to an AND gate G 12 and an AND gate G13. In the activated state, the gates G12 transmit outgoing call signals through the AND gate G14 to the time-division multiplex line Lb, nl / n2, which originates from the selector module SMnl / n2. The outgoing call signals, which in addition to a call code C contain the m-l number of the calling control unit, are constantly stored in call registers REG-C. In the activated state, gates G13 transmit ml-16 operation information via AND gate Gl 5 to operation input 01 of the time stage. Each priority device PD assigned to an m2 number is also guided with all its outputs to an OR gate G16, the output of which is connected to the first input of an AND gate G17, which in the activated state has m2-16 operational information on the operational input 02 of the time stage transmits. The operation information ml-16 and m2-16, which are constantly stored in second operation registers OREG2, are used to establish 16-16 message connections. Both inputs of a gate G12 or a gate Gl3 are assigned the same m number. In addition, the gates G17 each have a second input which is connected to that register of the second operation register OREG2 which stores an m number corresponding to the m number of the associated priority device.

Gates G14 are open during time slot 0 of the corresponding receiving control unit, provided that a call but no response is to be transmitted to the receiving control unit. When an outgoing call signal is transmitted to the receiving control unit, the gates Gl5 and G17, which are assigned to the corresponding m2 number, are open during a second operation pulse to the m2-5 pulse, corresponding to FIG. 6, which belongs to the corresponding time slot group .

The gates Gl 1 and G14 are controlled without the above-mentioned multi-framing since it is assumed that the time-division multiplex line Lb, nl / n2 separately connects the selector module SMnl / n2 to the line module which is defined by the n2 number. Thanks to the separate line Lb, nl / n2, the outgoing call signals do not need to contain the nl number that belongs to the line module sending out.

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Claims (3)

649 665 PATENT CLAIMS 1. Integrated dialing and transmission network with a plurality of line groups (LG), which with a non-blocking digital selector (S) with mutually identical dialing modules (SM) via associated line modules (LM), each with a transmitter (T) and a receiver ( R) and are connected via associated time-division multiplex connections (La, Lb), each of which has a first time-division multiplex line (La) and at least a second time-division multiplex line (Lb), in order to transmit digital payload and control information from one transmitter (T) to To transfer voters (S) and from this to a recipient (R), wherein the selector (S) performs spatial and temporal channel switching, characterized in that each of at least two selector modules (SM 1/2, SM2 / 1) is assigned to a pair of line modules (LMi, LM;), said time division being via multiplex connections Input is connected to the transmitter (T) in one and its output is connected to the receiver (R) in the other of the pair of line modules that each selector module (SM) for information transfer from the transmitter (T) assigned to it to the receiver assigned to it (R) has a time stage (TS) and a logic circuit (SL) which converts control signals coming from the transmitter (T) into operation signals for controlling the associated time stage (TS) and into control signals for the receiver (R) that no connections between the output of any dialing module and the input of any other dialing module (SM) are provided, and that each of the line modules (LM) has a control unit (CU) for producing Has useful connections within its own line group (LG) and, in cooperation with the control unit (CU) of another line group, to control the dialer when establishing a user connection between its own and the other line group. 2. Integrated dialing and transmission network according to claim 1, characterized in that in addition at least one further dialing module (SM2 / 2) is assigned to a single line module (LM2), its input with the transmitter (T2) and its output with the receiver ( R2) is connected via the time-division multiplex connection (La2, Lb2). 3. Integrated dialing and transmission network according to claim 2, characterized in that the line group (LG2) connected to said single line module (LM2) contains at least one line subgroup (LSG2, 1 to LSG2, m) which is connected to a line module in this ( LM2) contain the control unit (CU2.1 to CU2, m) for establishing user connections within the associated line subgroup (LSG2.1 to LSG2, m) and, in cooperation with the control unit of another line subgroup, for controlling the dialer when establishing a user connection is connected between your own and the other line subgroup.