DE1811533C - Circuit arrangement for telecommunications systems, in particular telephone switching systems, with individual and shared devices - Google Patents

Description

The invention relates to a circuit arrangement for telecommunication systems, in particular telephone switching systems, with individual devices that are connected to a common device via information circuits can be switched on.

It is well known that information circuits between individual and common devices can can be provided individually for each individual device as well as jointly for this. Fm first Trap is a star network of information lines, the star center of which is the common Device forms; in the second case it is a series line or a ring line for the transmission of information proceeding from the common device to each individual one after the other Devices is performed. On the one hand, the star network enables individual devices to be connected in the shared device - i.e. where the connection is controlled from - and offers on the other hand greater operational reliability because line faults are limited to that individual device remain whose information routing has become faulty. In contrast, a series or a ring main has the advantage that it is less expensive. A ring line offers a Series line has the advantage that, due to its characteristic ring-shaped structure, a single line interruption does not lead to an interruption of the function, because it is well known that a ring in two parts can only be divided by two breaks. However, this advantage brings on the other Side with the difficulty that a single line interruption does not appear by itself occurs, so that the intended operational security may have already been lost without this fact is even recognizable.

In such a comparison between individual devices with their own information lines (star network) and shared information lines (series line or ring line), the importance of switching devices that ensure that information transmitted via an information line in different relationships in the shared device must also be pointed out required way to get from the common device to the transmission or to find in it: Information that is intended for transmission from the common device to an individual device, originate in the crstcren of an information source in a way that is usually for direct transmission via the Information line is not appropriate. Switching devices are therefore usually inserted between this information source and the information line, which store, convert (code) and / or amplify or attenuate the information at the right time, in the correct form and with the correct energy level for transmission to the information line Have an effect. The same applies to the reverse information transmission direction, which is a so-called information sink instead of an information source in the shared device. The aforementioned shadow devices are therefore used for the technical implementation of the transmission of information via the information line. These switching devices are referred to below as information transmission device and information receiving device. The characteristic task of these switching devices is not simply the transmission and reception of information, but rather the preparation and processing of the transmission of the information via the information line. The origin and destination for this information, however, are the mentioned information source and information sink.

Based on the previous comparative explanations on the individual and common

ίο information lines must be noted that the said Switching devices also jointly when using a common information line must be provided for the individual devices, on the other hand when using individual, individual devices assigned own information lines can be provided individually for each information line be able. Are these switching devices like the information lines individually for each individual device provided, this offers a high degree of operational reliability

ao, because malfunctions in these switching devices are limited to the respective individual device. However, if these switching devices are like the information lines K each intended for a common device, the effective interference width extends to ground

an error occurring in the relevant switching device affects all assigned individual Equipment. On the other hand, this common assignment enables a saving in terms of effort for the named ones Switching devices.

As now for the information transfer between the information source of a common device and the individual devices assigned to it and between these and the information sink of the same on the one hand, there is a need for a high level of functional reliability and, on the other hand, the one required for this Effort should be limited as much as possible, the task of the invention is to create information circuits between common and individual Devices both in terms of the technical effort required for them and in terms of their operational safety and optimally design their monitoring. According to the invention, this is achieved by that the information transfer both from the common device to the individual devices

as well as information circuits serving in the opposite direction are designed as a loop of lines running over all individual devices, their both ends are connected to the common device, and to each of the individual devices individually by means of an interface device assigned to it, e.g. B. a connection relay, can be effectively switched on, that one end of the line loop with the output of an information transmission device and the other end of the line loop with the input

SS an information receiving device of the common Device is connected, and that between one with an input of the information transmission device connected information source and one with an output of the information receiving device

linked information sink of the common device, a comparator is connected, which shows a deviation or correspondence between those given by the information source and those from the information sink recorded information.

The invention thus provides information on a line loop a certain direction for the information overload

set, namely the same direction for information transfer from and to the individual devices: From the common device to an individual one Information transmitted to the device is always from one end of the timing loop given on this; Information transmitted from an individual device to the common device are always released from the line loop via its other end. So there is an information transmission facility, Line loop and information receiving device in series. This is how it becomes enables each time information is transferred from a shared device to an individual device to monitor in a simple way the functionality of all elements serving the transmission of information, namely the information line designed as a line loop, the sending direction and of the receiving device: With every transmission of information from the shared device to one individual device also gets the information - after they have the information line in their has run through the entire length - received again by the shared device and fed to the comparator, who had also recorded the information previously sent out. If there are deviations between the two pieces of information recorded by the comparator, this suggests an error close in the transmitting device, the receiving device or the information line, so that Malfunction alarm is signaled. If, on the other hand, there is a match, an acknowledgment character is displayed educated.

According to a further development of the invention, it is also media that are functional during the transmission of information to check from an individual device to the common device: Accordingly is an input of an auxiliary memory; to one with the Output of the receiving device connected information sink and an output of the same an information source connected to the input of the transmission device of the common device switched on; the auxiliary memory is caused to output information by switching means that switch off of all individual devices from the line loop. After the information transfer from the individual device to the common device and disconnection of the former from the line loop the received information is given again to the information transmission device; she will at the same time fed to the terminal of the comparator connected to its input. The information is transmitted via the information line, received again by the information receiving device and fed to the comparator.

According to another development of the invention, the transmitting and / or receiving device contain Buffer and / or code converter. In an advantageous manner, the latter are also included in the described Examination included, without any special! Effort is required.

According to another development of the invention, a first parameter evaluator and a parity value memory are connected between the comparator and the information source, and a second parity evaluator is connected between the comparator and the information sink. As a result, the time required for the controlled transmission of information can be significantly reduced, because with an arrangement according to this development of the ijfindimy ikr Veruleichsvor-7'.inj on a pariiütsvjryl.: Ic! I rc Ju ed \ u :: \ the relevant information w > n the information history no longer has to be provided until it has passed through the information transmission device, the information line and the information reception. Without significant circuitry for the Pnriläisspeicher, it is possible through the previously described Weiler-ίο formation of the invention to summarize several pieces of information and at the same time to transmit the I.leitungsschleifc and still to transmit the information individually controlled with the help of the parity value. The comparison process is recorded

all errors of the first order so such "errors that almost only occur. Fehu. ·· first order «are as is well known, those that go back to a single cause, while errors are second or higher Order are those which refer to two or more different independent causes decrease. - The last-mentioned embodiment can still be varied in different ways.

In the drawings F i g. 1 (from Fig. La and I b existing) to 4 are exemplary embodiments (i-.τ F.rfindung shown only in components that contribute significantly to their understanding. Based on F i g. 3, an exemplary embodiment according to the invention is intended to follow the general principle of the previously explained Invention and some of its further developments come to the fore; Fig. 4 shows the last described Further development of the invention. In contrast, a communication switching system shown in FIGS. 1 and 2 is intended explain a possible use of the invention in telephone systems. The following The description therefore begins with the explanation of FIG. 3.

In Fig. 3 several individual devices 7 (71 to JGn are indicated. Furthermore, a common device AS is partially re-created. The latter is connected to the individual devices via an information line UM designed as a line loop, which also has control circuits for connection relays Mol, ..., are coordinate Mon of the individual devices. the two ends of the designed as I.eitungsschleife Informationsleiiung £ / 11 joint unit are to represent connected. at the latter, the individual devices alternatively assigned by them Anschalterelais mol to Mon effectively connectable. with are "effective anschaltbar.- With regard to the connection made, it is not intended to express where this process is found, but rather it is stated that a process takes place through which the connection of the individual device to the information line becomes effective Transfer of information from the common n device to the individual devices and vice versa.

An information transmitting device SS and an information receiving device £ 5 are provided in the common device AS. One end of the Lcityingsschleifc is with the output of the information transmission device and the other end of the Lciumgsschlcifc with the input of the Informationscmpfang-

facility connected. The information column facility

tun ^ & S ν also has an input and the Informationscmpfangsoinriehtuiig ES an output.

The entrance to the information system is

5 6

with an information source Q and the output of a single one of these connection relays is with the help

Iiformalionsempfangseiniriclitung with an information of contacts in the identifier Jd made,

mationssenke / 'connected. These as technical Bc- which are not shown in detail. With the help of

Terms used in the drawings were previously such as contact eg, working side, are the connection relays

is explained and defined as follows: Information that can generally be switched off for the S.

Transmission from the common device to an indi- The common device AS is determined by a scalesvidiicllcs device, originate in the dashed line shown on the right in two parts ersicron an information source in a way that divides. In the lower part, in which the coincidences are usually shown for a transmission via the information gates G 13 and G 14, the malionslcuimg is not appropriate. Between this information relating to transmission to an information source and the information line, individual devices are provided or the switching devices are therefore usually inserted. Infordie received from an individual device, the information is fed to further processing at the right time. A d: r correct form and with the correct level of energy to be sent to an individual device for sending Alis on the information line 15 passes through the gate G14 to the information channels and to store, converting (code) transmitting device SS. Here, one input and or have a reinforcing or dampening effect of gate G14 for the transmission of the information. The same applies to the reverse information and the other input to the Galter Ci 14 for mation transfer direction: The mil help one of the information to switch the information permeable. The information above-mentioned switching device (information transmission is from the information transmission device 5.V device) corresponding switching device (information is initially recorded and temporarily stored, nialionsempfangseinrichtung) from the information, it is at the same time converted into a form of information recorded in the common device For receiving information in the individumations, an information sink of the hurry is suitable. As soon as the identifier is supplied to my device. 25 Jd in that individual device the switching device called switch-on Dio (information relay is energized. For which the relevant information sending and receiving device) is determined, the relevant switch-on off contacts are not always closed. The line loop U 11, the (storing, converting, amplifying or attenuating) receiving switching means, transmitting switching means and connection. You can switch on the opening. * 30 switching contacts are all shown simply. Part of these functions may be limited. For the Da, however, it is a multi-core cable for special cases. ClaW information in the form in which it deals with the transmission of coded signals must arise from an information source, and it must be pointed out immediately that the electrical circuits of the conductors for transmission via an information line loop U 11. Each of these orders the receiving relays that are suitable for transmission Switching devices 35 contacts and the connection contacts each multiple times only from one connecting line. Corresponding are provided. If the individual device is effectively connected to the line loop for the reverse information transmission, then direction becomes. The information sources and 40 stored in the information transmission device SS carry the information source and 40 connected to the input of the information-cloned information to the individual device transmission device. The relevant switch-on relay is then switched off again with the output of the information reception, with which the information sink connected to the information device is a transmission is ended.

Compare I g switched. This is provided for outputting the criteria via the gate G14, which also indicate a discrepancy or information given to match between information. 45 same Γ ?. The information sent via the line loop U 11 also arrives - after the information receiving device has passed through the line loop one after the other - to the information set and the line loop in its information receiving device £ 5. It will have run through an empsatnlen length here. catch and after an intermediate storage and Um-It was carried out that the individual devices 50 setting passed on to the comparator Vg . If, alternatively, there is agreement by means of the connection means assigned to them, the line loop can be effectively connected in this one Krian. In terium formed by which the agreement an-F i g. 3 it is shown that the individual devices are shown. It is possible to use this criterion with their rectifiers GrI. Gr3 in series to make the continuation of further switching operations in the switched Seridesehaltmittel.fi sn and their 55 common device AS dependent.

also with rectifiers Gr2. Gr4 in series ζ. B. the sending of further information.

switched receiving switching means El En to the If this agreement is not achieved, however,

Line loop are connected and that this is so a criterion is formed by which an alarm switching means is triggered with the help of contacts mo \, .. .. man signal. It is possible to be activated depending on. This is known to prevent all further switching operations of the mutually important with a connection of this switching device AS until the causal agent on the line loop, because the error has been searched for and corrected.
Connection irrespective of where the connection contacts are as shown in FIGS. 1 and 2 below. is described, is also used for the transfer of information

The connection relays Mo 1 Moη are from a 65 giing from an individual device to the common

Identifier Jd of the common device AS control device the former to the Leitunesschlcife with bar. Only one help from the Asischallerelais is ever sent over a multi-channel multiplexer. /.B. Λ / n I. effective anein / iiics of this relay energized at the same time. The selection switched. Line becomes' trusting information

ok

with the help of transmission sound means, ζ. D. si, the individual device delivered to the Leitiingsschleife t / 11. The information is received by the information reception device ES , temporarily stored and converted into a form suitable for further information processing in the common device AS. If the parts of the shared device AS that process the information are ready to receive, gate G 13 is opened via control circuit # 13 and the information is fed to the information-processing devices of the shared device via this gate. The information is also fed via gate C13 to an auxiliary memory VS , which stores it. As soon as the information acquisition in the common device AS is finished, the contact eg returns to its rest position, whereupon the relevant connection relay in the individual device drops out. Beyond the rest side of the contact eg a criterion to the auxiliary memory VS is given, which causes this to deliver the information stored in it information from the information transmitting device SS after a certain predetermined delay time. Now that none of the individual devices are effectively connected to the circuits of the line loop U 11, the information is sent again via the information transmission device SS to the line loop (/ 11. After it has run through the entire length of the line loop, it is transferred to the information receiving device ES received and delivered in the same way as before via its output. It reaches the comparator Vg, which had previously also received this information from the other side from the auxiliary memory VS. The reaction of the comparator is the same as described above. Completeness For the sake of sake, it should be mentioned that when the information was transferred from the auxiliary memory VS, the gates G13 and G13 α were switched back to their blocking state.

Before a practical application of the circuit arrangement according to the invention according to FIG. 3 in one Telephone system according to FIGS. 1 and 2, some correspondences between the Circuit details according to FIG. 3 and those according to FIGS. 1 and 2 indicated.

The in F i g. 3 indicated individual devices

/ Gl JGn are in Fig. 1 a with VSi. RSi. RSl,

WSl. STv. STt, STc and ST 1 to STn . The device AS common to these individual devices is denoted by ASi in FIG. It is therefore evident that in FIG. 1 shows a telephone system. which has several groups of individual devices, each of which is individually assigned a common device. The individual devices of a group and the common device assigned to them are connected to one another via a transmission line of a first type Uli , which is designed as a line loop. From Fig. 1 also shows that central devices ZSl and ZSt are assigned to the common devices, which will be discussed further in detail.

The groups of individual devices belong in fig. la shown working fields AFl to AFlX . ^ Hc further, wrong below. individual bcsch'ricbcn. JfHe common: devices, e.g. B., -1.Vl. are hereinafter referred to as ÄrfeiÖfeldsteHerwerke. The previously repeated. Named Lehungsschleife is hereinafter referred to together with the circuits for connecting the individual devices as a transmission line U 11 of the first type. It is also embodied as a line loop in the spray gun, shown as a block diagram in FIG. 1, although this is no longer indicated by the drawing in FIG. 1.

In Fig. 2, only a single individual device is shown in extracts at the top. Fs is with ST 1

The connection relay Mo of this individual device can be controlled by an identifier Jd of the work field control, as in FIG. 3. The circuits for information transmission shown in FIG. 2 as part of the transmission line Uli of the first type from and to the individual devices are also designed as line loops, one end of which is connected to an information transmission device and the other end of which is connected to an information receiving device

3, the information transmission device SS shown closed contains a command memory BS and control gates (79 to G12 also shown in FIG. 2). The information receiving device ES shown in FIG

»5 shown information memory JS and control gates GS to G8. The gate G 13a and the auxiliary memory VS shown in FIG. 3 are omitted in FIG. The Verglcichseinrichtung Vg shown in FIG. 3 is also referred to in Fig. 2 with Vg. Also found in FIG. Gates G13 and G14 shown in FIG. 3 in FIG. 2.

The Arbeitsfcldsteucrwerke AS to AS Il of the switching system of FIG. 1 are about Überiragungsleitungen the second type Ul with two Zcntralsteuerwerken ZSL and ZSL in Connectivity "iig. The arrangement of two Zentralsteuerwcrke serves in known manner both to increase the reliability of the entire Vermittlungsanlagc with respect to the Possibility of a failure function or an operational interruption of a central control unit as well as error monitoring by comparing two information supplied by two different central control units. Since this is not essential for understanding the invention, only a single central control unit is mentioned below. - Data transmission devices / Jl, Dl , etc. are connected to the transmission lines of the / wide type . With a / \ c \ - th. Individually assigned data device. / .H. Dl ' distant fields of work. /. B. All ·. through their transmission lines of the first kind. /. B. i / l / - ", and via your work field control units. /.B.

ASI '. enable the exchange of information with the central control units' /.Sl and ZSl. The Dalen device Dl belongs to a / wide file area and a further, not shown, remote work area. It is also possible for several.

Work areas located in one and the same distant place to provide a common data path.

The fields of work each consist of a number of different types of individual devices. I lieriintcr are inter alia in the switching stages -I and Ii of the three-stage switching network; the coupling lips joined together by a coordinate coupler. z. B. K (ii to KGn. KGl 1. KG / - '2. MiTr etc .. / ti adjust. Each coupling group. /.B. Λ (/ 1. Is! One

109 644 233

own control, ζ. B. STi to STn, STfI to STfv, assigned, which executes the setting commands received from the work field control unit. In each case a coupling device with an assigned controller forms an individual device, and individual devices are also the entirety of the couplers of the coupling stage C with its controller STc. It is also possible to combine these couplers in one work area in several individual devices with their own controls.

Individual devices are further Verbindungssätzc, for example VSi, VSI, durchzuschaltende for within the areas of the working AFl to AF ^ 11 formed switching system compounds, further relay sets, z. B. RSX to RSi, the connecting lines (local or long-distance lines) to switching systems at other locations for incoming and / or outgoing connections are individually assigned. These individual devices also include dial receivers, for example WSi and WSl, with which subscribers are temporarily connected to record the wahhning information they have given, and preferred coupling groups, e.g. B. AlG v, and preferred single-stage couplers, e.g. B. Kt, which are each equipped with their own control, eg 57ν and 57 "/. These preferred coupling groups and couplers have a meaning corresponding to the larger and smaller selector star switches known from conventional switching systems.

In addition, subscriber-specific subscriber line circuits (not shown) can be used individually or arranged in groups as individual devices.

All of these individual devices in a field of work, e.g. B. AFl, are available via a network of transmission lines of the first type, z. B. i / 11, with the relevant work area control unit, z. B. ASl, in connection. Each individual device contains viewing aids that can be controlled by the work area control unit. To this end, if there is a need for connection in the individual device, the latter issues a connection incentive to the work field control unit, which is identified here and leads to the issue of a connection command to the individual device in question.

The coupling switching means of several work fields in one place form a single common coupling field, which is only divided into several areas of responsibility of several work field control units for reasons that are not causally related to the grouping of the coupling field (e.g. reliability, expansion options and questions of traffic load) . This switching network is made up of couplers in several, preferably three, switching stages connected to one another via intermediate lines; to the inputs of the first coupling stage (Fig. I: A) subscriber stations Tl to 7 "6 - to AFF Tl to 7" 8 -, connecting lines and all inputs and outputs of switching elements necessary for connection establishment and connection monitoring per connection are connected in the same way via subscriber lines; The outputs of the couplers of the first to the penultimate coupling stage, which are individually connected to the inputs of the couplers of the respective downstream coupling stage, can be interconnected in pairs in this subsequent coupling stage. Such a switching matrix shows and describes the see Auslegeschrift 1235 379. The special characteristic of a peculiar design of such a known switching matrix is, according to the above-mentioned Auslegeschrift, that the outputs of each of the couplers can be reached from a switching matrix input via at most a single connection path. As a result, when searching for a route from a switching matrix input, the route to be switched through via the switching matrix for the desired connection is already clearly defined by selecting one of these outputs. The switching matrix is constructed purely like a fan, seen from its inputs to the outputs of its couplers. In spite of this, however, two switching matrix inputs can alternatively be connected to one another via different paths, in that from the two switching matrix inputs there are always several common coupler outputs or two each of the last switching stage in different work areas and each via one

ao intermediate line fesi: connected coupler outputs are accessible.

The fields of work, e.g. B. AFl, so each have three coupling stages, the couplers are connected via intermediate lines in the Weiüe that one each

As the coupler output in the first to the penultimate coupling stage A and B , a coupler input in the second to the last coupling stage B and C is individually permanently assigned. The outputs of the couplers of coupling stage C are unconnected in all the work fields AFl to AF 11 and AFF at least in part. In the work fields AF1 to AF 11, some of these outputs are individually connected in pairs via intermediate lines ZLC leading from work field to work field.

A program memory PSl and PSl are each assigned to the one-to-one, subordinate, central control units ZSl and ZSl. The central control unit takes from the program memory according to which program a piece of information issued by a work field control unit and recorded in the central control unit is to be processed. A common multi-part information memory ZJS is also assigned to the central control units, the entire storage capacity of which is available to both central control units as required.

The network of transmission lines de second type Ul is a device FS for on and off would be assigned information, via the di <central control units and ZSL ZSL immediately it may be enough. With the help of the device FS it is possible to control the functionality of the central control

* Check the works and change the memory content of the program memories PS 1 and PSL (save

and / or save).

Furthermore, a work field control unit AS1 is assigned to the network of transmission lines of the second type, which in the event of a fault in one of the work field control units. AF1 to AF1 can be switched on temporarily in its place to replace it. The work field control units are therefore uniform and mutually interchangeable.

In Fig. 2 further details of a ii Fig. La shown work field control unit AS 1 is provided. The work field control unit is via transmission lines of the first type, for. B. U 11, with indi viduellen devices such. B. the control device ST of the coupling group KGl, and via transmission

Lines of the second type Ul with the central control unit shown in Fig. Ib in connection. The work field control unit shown in Fig. 2 can be of the individual members, for. B. from the Koppclgruppensteuer 5Tl, requested. With the help of the identifier Jd, the work area control unit is able to respond to several connection stimuli that are present at the same time. those about request contacts. /. R. to be switched on, select one and send a corresponding switch-on command to the type of switch relay corresponding to the switch-on incentive in question, e.g. B. Mon to submit. The request circuits are individually brought up to the work area control unit from each individual device. Fs is also possible, however, the request contacts, 2nd B. on. the individual devices, e.g. B. 571, to be provided in a coordinate-shaped'Sn matrix. As a result, the number of request circuits can be reduced significantly, in the best case to twice the square root of the number of individual devices operated by the work area control unit. The connection relays, e.g. B. Mo. of the individual devices lie in a control matrix that extends over all individual devices.

With the help of contacts rno the relevant Anschalterelais Mo are both transmitting switching means connected s and receiving circuit means E of the switching network control 571 effective. At this point it should be pointed out that the transmission switching means s and receiving switching means E of the coupling group controller 571 are each provided several times and that information to and from the work field control unit is transmitted via the transmission line of the first type t / 11 with the aid of a parallel code. So this means that the costs associated with the transmission switching means s and receiving switching means I carry Ling lines are vielädrig. All of the information to be transmitted is at the same time on the wires of the multi-wire transmission line i / 11. Since, on the one hand, the transmission lines of the first type, e.g. B. Uli, do not extend over long distances, and on the other hand, relatively cheap transmission and reception switching means can be used because they fully meet the speed requirements for information transmission using the parallel code transmission method, the relatively large number of both the Circuits of the transmission lines of the first type, as well as the transmission and reception switching means for the connection and for the transmission of information, nevertheless do not represent an unfavorably large circuit technology expense. In the present case, these reception and transmission switching means are electromagnetic relays or contacts of them. However, it is also possible to use other equivalent switching means for this purpose.

In preparation for a description of the mode of operation of the work field control unit, a few definitions of terms should first be given, as can already be seen from the above explanations. information is transmitted both from the individual devices to the central control unit and from the central control unit to the individual devices. In any case, the work area control unit serves as an intermediate link. The transfer of information from an individual link to the central control unit is always referred to as "reading" in the following. The reverse transfer of information from the central control unit to an individual device is always referred to as "writing". Accordingly, the »reading« and »writing« criteria are created in the work area control unit. There·; The »Lose« criterion is always formed in the work area when there is a requirement on the part of an individual member. /. B. from the coupling group control S7 1 via the request log " ¹ ·.! (<<;,

ίο is present and if all switching processes are previous Functional sequences have ended. If, on the other hand, there is no such requirement on the part of an individual Device before, so in Arbeitsfeklsieiierwork the criterion "writing" is formed, which is the readiness of the work field control unit expresses the inclusion of information in the central control unit if applicable, are available and are to be transferred to this work area control unit.

In addition, it can also happen that

ao there is neither a request on the part of an individual device, nor that the work field control unit is ready to absorb information. This operating state exists when a work area control unit with the processing of information

as is not finished yet. In this case the Arbeitsfeldsteuenverk is not ready for any information exchange rrut the central control unit. The »blocking« criterion is formed in the work area control unit. As can be seen from Fig. 1b and as already described, two central control units are provided. Accordingly, the transmission lines U1 of the second type are also provided in duplicate. In addition, in the work field control units, devices and circuits that serve to transmit information are also provided in some cases in duplicate. This is in FIG. 2 not shown for the sake of simplicity. Furthermore, comparison arrangements (not shown) are provided at various points. This makes it possible to monitor the correctness of the information transmission and information processing. Furthermore, it can be ensured in a simple manner that if a fault occurs at any point in the central information transmission path, the operation of the switching system can still be continued. Since these advantages of duplicating central parts are known per se, this duplication is only reproduced in a few places in the exemplary embodiment.

A common transmission line Ul runs from the central control unit ZS 1 to all work field control units. In a cyclical sequence, ei asks all work area control units one after the other to determine whether the criterion "read", "write" or "block" is present. For this purpose, each work field control unit has an interface device GA . An address receiver AE is assigned to this interface device GA. So that only one single work area control unit is switched on during the cyclical query of the work area control units by the central control unit, each connection is activated by sending the respective address (this address must not be confused with the further addresses of the individual devices described in detail below) of the respective work field control unit initiated by the central control unit. This address transfer from the central control unit to a work field control unit at the time

7ΠΑ

vveiligcn connection of the latter to the transmission line / 2 of the second kind can happen in various ways. It is possible to have one separate address line of the transmission line / '2 to be assigned to the second type. The central control unit sends the address of the relevant work area for the required duration of the connection out. The beginning and the end of the connection are easily defined by the beginning and the end the address transmission is determined via the address line.

On the other hand, it is also possible to transfer the address of the relevant work area control unit, which I should switch on to the control unit of the second type or switch off from it, via this control unit. The address receiver of each work area control unit must be permanently connected to the transmission line ί'2 tic of the second type. The connection and disconnection of the work field control unit by its connection device GA are always initiated by the central control unit in this case that the address of the relevant work field control unit with an additional criterion "connection" or "disconnection" on the transmission line Ul of the second type from the central control unit To this end, it is ensured that the addresses with the respective additional criterion cannot be confused with the other information to be transmitted via the transmission line V1.

If the central interlocking initiates the connection (or disconnection) of a work area control unit 3; to (or from) the transmission line VI of the second type, only the address receiver of the relevant work area control unit reacts and controls the coincidence gates G 16. G 17. G18 and G19 the connection device GA aiii (or to).

The criteria *> reading ". -Write "and" Blocking, are formed in the sequence control AB of the work area control units ": the criterion -read- is via the output /, the sequence control- \ ur \ c. AR and the writing criterion are issued by the sequence control via the .S output. The blocking criterion means that the two criteria reading and writing are issued at the same time, but it is also possible to identify the blocking by the lack of the two criteria of reading and writing or to provide a third signal circuit.

I eat these criteria. Lettering and blocking are offered to the / cntralsteuerwcrk. Whenever the / cntialskucrwerk via the connection device G 1 connects a workstation to the transmission line Γ 2 of the / wide type \ cianlaH. it receives one of these three criteria. In the transmission of these criteria 6n, the transmission line V1 of the wide type can be identified 11111: 111. But it is also possible to give these knees to the zeniralsiiMieiwcrl. practices the transferring performance {'2 of the / while offering all itself R;

In I 1 L '2 one of the two components is also indicated. As from I 1 L 'I lieiviiigehl. Is it possible. Arheilsleldstcuciwjrki z. B. the work area control unit AFF. remote control from the zenual control unit. In this case, it is useful to include a file tree in the branch of the transmission line / 2 of the second type leading to a remote control unit, the terminals of which are denoted by D1 and DY in FIG Invention and is therefore not described in further detail here.

If the criterion -slide- is present in a work field control unit, a corresponding criterion is transmitted to the central control unit as soon as the central control unit initiates the connection of the work field control unit via its connection device GA in the manner already described. If the central control unit has stored information to be transmitted to the relevant work field control unit in its information memory, it now transmits it to the relevant work field control unit in a manner which will be described in detail below. If, however, no such information is available, the central control unit will initiate in the manner described that there is no such thing. Work field control unit is switched off again by its connection device GA from the transmission line Vl of the second type.

If, on the other hand, the »blocking« criterion is present in a work area control unit. if the central control unit causes the connection of this work field control unit, the central control unit causes the described way the shutdown of the work field control unit in question regardless of whether a Information to be transmitted from the Zenlraisteuerwerk to the Arbeitsfeldsteuenverk is or is not available.

If, on the other hand, the criterion * read is present in a work area control unit. so it is transmitted in connection of the working field control work to the central control unit also via gates G 15 and G17 then outputs the central control unit, a criterion to the working field controller back, which initiates the transmission of the relevant information from the Arbeitsfeldsteui'nverk via the transmission line Vl to the Zentralsieuerwerk. The information is transmitted in several sections. Each piece of information is introduced separately by special criteria and confirmed. This and the information transfer in sections will be explained in more detail below.

Each entry is divided into several pieces of information. All information is preferably binar encoded db both on the Übertragungsleiiuniien ill Ainet s.:its and Vl other hand, transferred as the zwischengespeiclierien in the Arbcitsfeldsteuerung and transcode information The Lmcodicrung in Arbeitsfcldsieucrwerk serves to adapt the transmission of information on the Übertrugimgslciiunccn the first type. Z . B. V 11. in the parallel code, to the transmission of information on the * transmission line of the second type Γ2 in the Scriencode. The information is transmitted on the transmission lines of the first type with the help of electromagnetic circuits and on the transmission line of the current type with the help of electronic devices. /. H. Transistors, iilvritagen. The high working speed of the latter serves only to graze the Überliaguiigs / cii aiii det zcnitalen I bcrlriigiingslciuing / 2 det / stay small

: u let, but it also enables information to be transmitted in the serial code mentioned, on the basis of which only a few transmission channels are belöiigt. In contrast, the information is transmitted over multi-core lines using transmission kits of the first type. Because these only extend over relatively short distances and do not cause high costs due to their multicore structure, suitable transmission times can also be achieved with electromagnetic relays or equivalent switching means, i.e. advantageously cheap switching means, as a result of the transmission of information by means of parallel code Type extend over relatively large distances with the help of a data transmission path, e.g. the radius of a large city or a central office area, can be due to the use of electronic send and receive switching means, the switching time of which is 4 to 5 powers of ten smaller than that of electromechanical Relay is used for the transmission of information, compared to parallel code transmission methods, which are inherently slower serial code transmission methods, which in an advantageous manner considerably reduce the cost of transmission lines U 2 of the second type Restrict permitted.

It has already been stated that the information is divided into several pieces of information, the transmission of which is carried out in sections via the transmission line U 2 of the second type with the aid of controlling criteria. The transmission of information over transmission lines, e.g. B. i / 11, of the first type is carried out with a parallel code transmission method. All partial information is transmitted simultaneously to the work area control unit via the multi-core transmission line i / 11. In the information memory / S, a part of the memory JS is provided for each of four pieces of information: / 51, JS1, / S3 and J34. Likewise, a part of the memory BS is provided in the instruction memory BS for each of four partial information : BSi, BSI, BSi and BS4. The different designation of information memory JS and instruction memory BS also means that for the central control unit it is in one case "readable" information and in the other case "writable" commands. These terms are retained in the following.

Each piece of information consisting of several pieces of information and each command consisting of several parts is for transmission on the transmission line L ^; 2 of the second type crgiinzl by a length specification and an address. (These are addresses of individual devices: they must not be confused with the addresses of the workstation control units.)

The length specification of an information or command transmission is the first to be transmitted. It states the quantitative extent of the information or the command transmitted the information or command transmission is limited to fewer partial information or partial commands. By the previous l.iinuennnuabe because the respective I nipfiin;.! Ci. and / was the respective;: e AihcilsfeUsU-tier-WOik niior das / entialsteiHTVicil .. When the respective information- Ivw. Ucrclilsiiherlnipiini ^1. Ie ¹ Ii ₁ U be In addition, each such transmission is preceded by an address specification. It is always specified beforehand which individual device an information comes from or for which individual device a command is intended.

It has already been stated that each piece of information is subdivided into several pieces of information. the The largest amount of information is determined by four pieces of information. The den ('cilinformalionen

ίο on the transmission line L / 2 of the second type directly The preceding address information can also contain one or two pieces of information take in. The length specification preceding the address specification takes in the present Embodiment a maximum of the scope of a piece of information.

The length specification, the address specification and the maximum of four pieces of information or commands are in groups of binary code elements of the same size

ao ten cached and recoded in the work field control unit and transmitted from or to diet, em; this recoding can be limited to a conversion of parallel-serial code and vice versa and can form a single common process with the intermediate storage. This group of binary code elements is referred to below as a "byte" (plural: "bytes"). A first byte containing the length specification, a second and a third byte containing the address specification, and - in the present exemplary embodiment a maximum of four - further bytes containing information or a command, each together form a "word". The transmission of a word via the transmission line U 2 of the second type is controlled with the aid of auxiliary criteria. These auxiliary criteria are "reading" (L), "writing" (S), "blocking"; (L + S) - as already described above - and »Acknowledgment« (Q).

It has already been indicated in what way information to be read by the central control unit from an individual member, e.g. B. the coupling control 571, to the work field control unit in FIG is transmitted. This transfer is preceded by a request about the request declaration.

This requirement is then identified with the aid of the identifier Jd. The result is the axis of the individual device .STl. This address is kept ready by the identifier Jd / ur transfer to the code converter CU 1 as I am used to energize the monitor relay Mo assigned to the individual member .S'7 1 via a five-coordinate signal. With the help of a contact mo of the latter, both side switching means λ and receiving sound means / ·. ' of the individual device .S'7 "1. Via a large number of circuits of the transmission line VW of the first type, the information present in the individual device is immediately / hastily /.S 'des Arheilsfcklsieuei werke *. The information is in ύ <; \\ IVilspciehetn JS 1 to y.S'4 of the information store JS mifi'.enomnien. Whereupon the KOpIK ¹ IgItIpPeIiStI ¹ IIeItInI ¹ , .S' / 'I by triggering the hcirclTetulen Uckiis .Wi · wiiilei

Rg is switched off.

The Ι11Γ111 nialion is ciuspiivhctul iUm stord ^ in the leilspcieliein JS 1 to 7 λ 4 tks Infiiimaliiins sncichcis in several Hvtes tiulcrleill. In the Inl'oi

I 811 533

17 18

With the information apart from the sequence control AB, the information is fixed to the extent to which it is indicative: The way in which the criterion "blocking" is sent to the central control unit is one of the two inputs of the control unit gate. Thereupon the sequential control system G4 offers ting. The individual in the information - an incremental pulse to the distributor V, This memory Λ? Stored bytes are each offered to a forward 5 switches its switching arm ν by one step, the gate Cl 5, G6, G 7 and GR. The gate G4 for the transmission of the Gmter G4 to G8 bring here symbolically to the length specification is blocked and the gate Gl for the expression that the respective information that is applied to one of its transmission of the address from the identifier JD to the length information is only then passed on. Code converter CU I controlled permeable. As soon as it is possible to leave, when this forwarding is completed via the other io, the Ab-Kingang of the gate switches a corresponding sign to the! Control AB, the criterion »blocking« is switched off and transmission is applied. This character is used by the "reading" criterion. This causes the Zeneinem distributor V with the help of its sound arm ν tralsteuerwcrk, which via the gates Gl, G13 and successively to the gates Gl, G4, G 5, G6, G7 G18 on the transmission line Ul of the second type and G 8 to handle a reading process and to record the address given at 15. As soon as this has happened to the gates Gl, G3, G9, GlO, GIl and G12, the Zentralsteuerwzrk via the processing -t ^: nes write operation is switched on, so transmission line of the second type U 2 an acknowledgment that one after the other the individual bytes for transmission via the permeable gates G16 to the sequence, namely first the length specification, then control AB. The central control unit has received the address the address of the relevant individual device ao. As already stated, the address and then the information or the command. be transmitted in the form of one or two bytes.

The distributor V is controlled by a sequence control. In the same way, the address in

AB controlled. From this process control, the partial information from the idle state is transferred in the form of additional bytes via gates G15 and G17, the work field control unit to the central control unit, criterion »Write« (S) to the central control unit »5. The length specification was previously offered in the offer. As already stated, this means stored for divisor V. It can therefore be found in the work the central control unit that the work field control unit field control unit the proper end of the Inforzum receipt of a command from the central control unit mation transmission. Because the length specification is ready. If, on the other hand, the work area control unit has been transferred to the central control unit, this applies when requested by one of the individual devices, and the same applies to the central control unit. After receiving, as soon as the length is reached; each, the address and start of the last partial information of a word gives the information ready to be transmitted in the work field - the central control unit last time the criterion control unit is stored, corresponding criterion is transmitted to the process control of the work field to the process control AB , the control unit returns. Since the initial over this causes the criterion "reading" to be transferred to the central control unit for the information to be transmitted both in the work bidding via the carrying of the length specification. Causes of this field controller in his Anschaltezyklus as the relevant Ar- was chert in the central control unit gespeidie connecting unit GA, it is possible in a simple manner to turn the beitsfeldsteuerwerkes, this proper to the transmitting end of the Informationsübertraleitung Ul of the second type, so 40 receives supply to monitor. If, after transmission of a, the central control unit does not initially accept the criterion of the partial information as an acknowledgment character from "reading" (L). For the central control unit, this means central control unit to the work area control unit, beyond that it carries from the work area control unit which has just been switched on, so the latter gives information after a certain unit has passed. As soon as the th time alarm in a manner not shown. Also central control unit by connecting to a free 45 is given an alarm if the central control unit is ready to receive the criterion in the memory line in the central information memory ZS position of the expected criterion "read", it receives the length specification rium "write" or "blocking" without recording that has already received the number of partial entry lines 1/2 of the second type offered by the work field control unit on the central control unit, which is due to the length. - It should be made up for here that gate G4 was indicated as such. - In one of the previous two of the work field control unit for the transmission of the cases, too little length information was already switched permeable by the central control unit, information was requested and in the other case, as soon as the sequence control AB determined the central control unit too little information that the length information, the Address and the mations offered.

Part of the information is ready to be transmitted in the work area. Thus, the lack of work area control length information from the central control unit is transmitted on the transmission line Vl of the units. It has already been stated that the second type has already started when the Zemrat control unit has initiated a work field control unit, which is ready to receive commands with the aid of the connection device G / 4, via the Oatter G15, the criterion Hing of the AfbeitsfeWsleuerwerkes. 60 "Writing" ready on the Oatter G17. As soon as now

The central control unit receives from the Arbcits- Zemralsteuerwerk in the already described field-controlling factory on the transmission line Vl of the way via the connecting unit GA which be · second type transmitted length specification. Once it causes them apt work field controller, is added to the, there is the criterion "acknowledgment" transmission line V 2 of the second type to scarf · (Q) th via the transmission line Vl the second 6y, it receives the criterion "writing" (S) . It kind of or via a separate criteria line to that it is assumed that there is a job for the work field * Arbcitsfetdstcuerwerk. This criterion meets in the control unit certain command saved. The defrost control AB on (Q). The central control unit then sends via the Oatter G16

181-33

the acknowledgment character (Q) to the process control AB of the work field control unit, the process control AB causes in a manner not shown via the distributor K that the gate G 3 is switched permeable for the first byte expected from the central control unit via the gates G19 and G 14. This first byte again contains the length information, which is received by distributor V and stored. He does so, after how many sein.- Fort circuits screen _v command transmission ends his

"As soon as the sequence control AR has received the criterion of acknowledgment", it switches off the criterion of writing "First, the working field fireworks process the length specification, then there is a switching pulse to the distributor V, which, as a result, keeps its switching arm ν by one step Thereupon the sequence control AB switches the criterion "write" on again. The last * - mentioned criterion causes the central control to instead of the length specification now the address of the individual device for which the following information is intended, via the transmission line U1 of the second The central control unit also gives the criterion "acknowledgment" to the sequence control AB of the work area control unit, whereupon this causes in a manner not shown via the distributor V , if the gate G 2 is switched permeable for Ss second from the central control unit via the Gates G19 and G14 expected bytes. This By te, which contains the address of that individual device for which the following information is intended, or a part of it, is received via the code converter Ci; 2 and transmitted via the gate G 2 to the identifier Jd. It is implemented by the code converter CUl. The identifier Jd causes the control relay, z. B. Mo, of that individual device, e.g. B. 571, which is indicated by the address.

The bytes containing the command to be transmitted are now recorded one after the other via the gates G9 to G12 and shown in the partial memories BSI, BSI, BSI and BS4 in the command mode ^^

wrote. It has already been exhausted

Information transfer from an "mr" c · via the work area control to a ' ^{ndlv | ü} " ^c " J ^Atl ^ ^L " ^tlL . ^S 'J, ". Viduellcn device and the Bdehl sl IhM im,. \ Rn fcldstciwrwcrk c mpfanuL-n. Adrc.s. and l ^; _{/ JS}

^^ X ^^^ ΐίΚ already described that the ^ usespci-

cherted command via cmc Y. ¹¹ : ¹ ^ ¹¹¹ ' ^V E _m pfanT _S schak der Transmissionie.lung U 11. ™ EmpfanfrssLnaii

ta mean E des' "f ^ f" ^

will, wöbe »the relay E symbol, be c nes ve v.

vorgetthenen receive brake '^ J; J ^ "g ^ is also used over ^d « ^ "g ™ ^, " ^. Leadership of the he, th A Λ Ul to the inton * o tion.sspe.cher JS «bertrajen, '" ^ m is recorded

Distributor V ^d * ^m . ™ ^en ^ 2SSL device address and .f ™
»5 saved command dem

One after the other we ^^ gn d.e Gat e

G7 and G 8 permeable e ^ ^te _A ^e "' _d

Compare Vg ^Zunac i ^s V _n ^d _f ' ^e _rm ^ In _en to the several ^.! Information ^

If the comparison now establishes Vs an output, it switches on an A'amMgnai. the comparator contrast ^üb? ™ ''^s''' ^m ™ 8% £ £ he's a ^ P ^^ ÄteiSnSg Up to sequence control ^ ß ^ J ^ SSS the crisis

at this point had ™ ^Ab 'J ^{u 5} ^, _en ? _ralstC uerler. formed around "blocking" ddcm entra "work""commanded" that ta dah.n allJ "read" - "f ± * " * ^{cn U} £ ^e _{t checked} that only after <^^ ! J ^ g ^^ y ^^ Ad

ie

_represent .

^ ^{on öete n} ' ^e . ⁿ >'"""control loop in full function and the entire leJungsch e» _{running control} .

tion fu
It se who
FunkuonswJ «

^ ξΖ ^ i.

»° _e ^g _ine ^B _b articularly advantageous ^d" _hingew iesen,

_d ⁸ after

Werk is switched off again from the transmission line U 2 of the second type

The command stored in the command memory BS is transmitted via a large number of circuits of the transmission line in the parallel code transmission method to receiver switching means, £: d «, individual items 5Tl. The relay B represents one of many intended fi "tf" ngjel "j.

With regard to the bytes of a word containing the information or the command, the information memory / S or the Be ehlsspe.cher BS represents a storage and transfer facility; the Um-Um-Umung can refer to an implementation Paral el- Sc

lent,

_g out _via the transmission line opportunity to use _{e d} i% inzelnen bytes of Be ""'. Command memory BS ^ information line I / H and also immediately take up _JS. Immediate- _{{C lffl} ßcfehisspeicher S5 au, J _{it is also} via the line

J ^ _{in de} ^E _n corresponding Tci spei-, 55/54 of the information store * / A on * b _s / 54 g ^ _{| h} Jg ₆ as the a

a rs «

21 22 f O

Comparator /. To be offered in addition to the command transfer nuimes. It is only to be assigned to crfor. which saves a substantial amount of time, so that this information is both from the internal. The high switching lorniiUionssoiHleeinrichumg.VS 'required for this and from the Parilälsausgesehwindigkeilen the Gaiter (7 S to (712 and the valer / Vl 1 is included. During the Zeil memory IiS and JS are anyway for the combination 5 Mimic:;, ilen die liiormationssendeeinrichtung.S'.V and work with the central control provided.

Then, on the basis of FIG. 4 need a development of their functional processes here, and

Leading example of an already specified further- during the first time the information about the (Jber-

Described formation of the invention. The display of iragungsleitiing U 11 becomes the evaluation result

In I "ig. 4, a modification from FIG. 3 shows the outstanding parity builder PA I in the parity store .Vp

went. Recorded in the following description of. This requires caching

Therefore, from a knowledge of FIG. 3, FIG. 4 will only see very little circuit technology

and description assumed. Effort, because - as already stated - the par

In contrast to the illustration according to FIG. 3, only a single bit is to be stored in memory Sp

the comparator Vf> between which with the input 15 must be able.

By reducing the comparison process formalionsquclle Q and the development of the invention described in FIG With the parital evaluator, the time required for the comparison process PA 1 and PA 2 and a parity storage unit 5p can be reduced to the greatest possible extent without this being an issue. This comparison cr Fj? is. as already notable circuit-technical expenditure for very seven intended for the delivery of criteria which are required for storage purposes. The comparison shows its deviation / wipe information. The process includes all errors of the first order that were implemented by the information transmission device.W and the errors that almost only occur, the information receiving device /:.V, one after the other It is possible for the comparator itself to have run through a specific entire length. to give a cherishing function.

The throughput on the (Latter (> 14 to emit the same way could be the first Paritätsauswerler

The information available is thus shown in FIG. 4 PA exercise a storage function. About it

In addition to Paritätsauswerter PA 1. In a known 30 also would is possible to Vergleichcr \ 'g corresponds

uiul therefore not described in detail, neither with your first parity evaluator PA 1 or

it is determined in the latter whether the checksum of the mild second parity evaluator / V4 2 is to be combined,

in any ("odeform given information In addition, with a corresponding

odd. '. ihliu or odd. Preferably configuration of the embodiment according to FIG. 4 more

If the code form used is about 35 different pieces of information are transmitted together,

a binary code. The individual Codeclcmente can- This should be a summary of a

now only either the value 0 or the value 1 always deal with the same amount of information,

to have. Such a summary of several in common

The Mim Paritalsauswerler determined information transmitted information was previously already as a

only consists of a single bit. The Parilätsaus- denotes 40 bytes. D ^; e information of a byte is

.ils result can only determine that when the information source 0 is jumped one after the other

the information transmitted via the (lukewarm (> '14) and are also used by the information

either looking at parity or not. The \ om paration sink P added. On the other hand, they are opposed

tälsauswerier Γ II determined result is stored in the line loop CIl at the same time with the help of a:

rather λ / ¹ for the time being / wisehenpespeicherl. 45 space multiples or frequency multiples transmitted

The! Named

on the basis of the I i ü.3 already described way of the information transmission device. i: SS and dei

IiifoniiaMons-ieudeeiiirii-liiiiiiü-W. the Leituncsschleife hiformationsempfangseinrichtung O executed.

ΙΊΙ and the information receiving device ES If the information is one after the other:

and! iclanci / ur ln! orm; iiiopsser.ke/ '. After 5 ° Bvies it changes from the information source Q to Informa

Γ i i. 4 transmitted at the same time from the Paiitiii> aiis \ verter / V-I 2 aiifgelionssendceinrichiungSS, so sii

nommeii. de- also and independently of the parity one after the other by the parity evaluator PA 1

liiisauswener / V-I 1 determined whether the received one is checked for parity. In this case de

Inlormation Pariläi \ orliect or not. The memory Sp can store as many bits as In

The result is the parity evaluator PA 2 to 55 formatior.en are contained in a byte. Are all

Sealer I '·>. the information of the relevant byte in this W'eisi already from the Pariiätsspeicher Sp

As a result of the evaluation of the parity evaluator PA 1, the parity is checked and the information is sent

lnr.cbotcp wiui. The Ycrcleicher I 'g now adopts a facility that has been used for this purpose

Comparison d ;. ^% r results of the results of the two storage tanks RS emhäli. ^ o transmits this all information

Parity variables PA 1 and PA 2. In so far as information from the married Dvic is at the same time to the

einiiv.mun; ' \ orlie »i. will be in the comparison of Kg pertaining individual devices at the same time

the Kriii-riiim formed, through which the correspondence these -iiiormaiioncn also from the Informationsemr

mung anae / eict becomes. fanpseinrichtimc I'S added mid of this

The ziivoi l "eseliri". Li ^ ne formwork-technical lines individually one after the other to the ParilätsaiiNwerur / '!

siinc enables i-inc especially to transfer Arlicilsweisc 65. the m. aiii Pariiäi checks. The I.n'cbni'-s

at <Ier! ηΓοιιη: ιΐίοη- ϋΚτΐι; ΐί! ΐιηΐ !. line au a im! '- i'ievr PriiMini; wi-iden nachi ^- in: mder i! im \ "ercleichc

«'Diielie * - (iciiit; ui-, uscihIcihIc Inlounaiion about the I · ■ /ii.cliiliii. Dci one \' eruleich with the in Spe

Gate fV14 only performs for a very short time - rather .S'p stored while.

OO

Claims (10)

Patent claims: 1. Circuit arrangement for telecommunications systems, in particular telephone exchanges, with individual devices that can be connected to a device common to them via information electronics travel, characterized. that the information transfer both from the common device (AS) to the individual Devices (7 (71 JGn) and vice versa Direction serving information circuits as to one over all individual devices (JGl JGn) running line loop ((/ 11) are formed, both ends of which are connected to the common device (/1.V) and to which each of the individual devices (J (H JGn) individually by means of an interface device assigned to it, e.g. B. a switch-on relay (Mn 1 M (* n), that one end of the line loop ((/ U) with the output of an information transmission device (SS) and the other end of the line loop (IMl) with the input of an information reception line (fe.S) of the common Device (AS) is connected and that between an information source (Q ) connected to an input of the information transmission device (SS) and an information sink (/ ') of the common device (AS) connected to an output of the information receiving device (ES ) a comparator (Vg) is connected, which signals a discrepancy or correspondence between the information emitted by the information source (Q) and the information received by the information sink (P). 2. Circuit arrangement according to claim 1, characterized in that an input of a HilfsspeichcrsiKS) to a with the output of the receiving device (ES) connected Informalionsscnke (P) and an output of the auxiliary memory (VS) to a with the input of the transmitting device (SS) of the common device (AS) connected information source (Q) is switched on and that the auxiliary memory (VS) for information output is caused by switching means (eg) , which indicate the disconnection of all individual devices (JG 1 JGn) from the line loop (Uli) . 3. Circuit arrangement according to claim 2, characterized in »e. that the information recording of the auxiliary memory (VS) is dependent on the information transmission from an individual device (z. B. / Gl) to the common device (AS) indicating switching means (gl $) . 4. Circuit arrangement according to claim I, characterized in that the transmitting device (SS) and / or the receiving device (ES ) contain buffer (BS; JS) and / or code converter (BS, G9 to (112; JS, G5 to G8) / contains. 5. Circuit arrangement according to claim 1, characterized in that a first parity evaluator (PA 1) and a parity memory (Sp) are connected between the comparators (Vg) and the information source (Q) and between the comparator (Vg) and the information sink (P ) a second parity evaluator (PA 2) is connected. (See circuit arrangement according to Claim 5, characterized in that the comparator (Vg) is combined with the parity memory (Sp) and has a storing function. 7. Circuit arrangement according to claim 5, characterized in that the first parity evaluator (PAl) is combined with the parity memory (Sp) and has a storing function. 8. Circuit arrangement according to claim 6 or 7, characterized in that the comparator (Vg) is combined with the first parity evaluator (PA 1). 9. Circuit arrangement according to claim (S or 7, characterized in that the comparator (Vg) rrit is combined with the second parity evaluator (PA 2) . 10. Circuit arrangement according to claim 5, characterized in that the information transmission device (SS) receives a plurality of information delivered one after the other by the information source (Q) and sends it simultaneously to the line loop (U 11) first converter (BS. G9 to G12) and the Information receiving device (ES) contains a second converter (JS, GS to G 8) which simultaneously receives the same number of information from the line loop (U 11) and sends it one after the other to the information sink (P), and the parity memory (Sp) for storing the same number is designed for parity evaluation results (1 bit each), For this purpose 2 sheets of drawings 109 644/2 700