SU1304763A3 - Telephone communication system - Google Patents

Abstract

Multi-party call system service, industrial and subscriber's telephone equipment and network, where the traffic between the individual substations is realized without the central telephone exchange, furthermore, the through exchange traffic of individual substations of the multi-party networks is realized as well. The controlled switch if the system is inserted between the multi-party line and the telephone sets of the individual stations the control point of the switch is interconnected with the proper code memory. The substations are connected to the multi-party line in one state of the controlled switch, and it is switched off the line in the other. The service version of the telephone network, provided by the invention for alternatively selective or open operation, has doubled proper code memory in all individual substations.

Description

one

The invention relates to communications and can be used to establish communications between individual substations (without using a central telephone exchange) by implementing selective exchange of information between stations.

The aim of the invention is to eliminate the possibility of unauthorized listening to the conversation of Two subscribers.

FIG. 1 is a diagram of a telephone communication system; in fig. 2 is a selective block diagram.

The telephone communication system contains n subscriber stations 1 connected in parallel to the subscriber line 2. Each subscriber station 1 contains a block of 3 called signals connected to subscriber line 2, to which the information input of the selective unit 4 is connected, the output of which is connected to the input of the 3 calling unit signals, and the output of the selective unit 4 is connected to the telephone set 5,

Selective unit 4 contains a code receiver 6, a switch 7, the memory element 8 connected in series, a logical signal processing element 9 and the element 10 AND whose inverse output is connected to the control input of the switch 7, the occupancy generator 11, the output of which is connected to open, other

dinene with the first movable contact of the switch 7, additional element 12 of the logical signal processing, the input of which is connected to the first output of the code receiver 6, the second output of which is connected to the input of the element 9 of the logical signal processing, the input of the code receiver 6 is connected to the fixed contact of the switch 7 The output of the additional element 12 of the logical signal processing is connected to the second input of the element 10 I, and the second output of the element 9 of the logical signal processing is connected to the input of the busy generator 11.

. The device works as follows.

Two code signals belong to each substation of the service network, with one code signal used for open operation and the other for selective exchange of information.

Element 9 of logical signal processing using code receiving signal - for selective conversation

The element 12 of the logical signal processing, ensuring the secrecy of the conversation, and the element 9 of the logical signal processing evaluate these calls. If this call is evaluated as a secret call, then the telephone unit 5 is disconnected from line 2 using element 10 I.

If this call is evaluated as open, all telephone sets 5 remain connected to line 2.

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In the event that the code signals coming from line 2 coincide with the own code signals of the memory element 8, the telephone unit remains connected to line 2, if these code signals do not coincide, the signal 9 element of the logical signal processing brings the control signal to the switch The reader 7 and the telephone 5 are disconnected from line 2.

ten

3047632

ka 6 registers the presence or absence of information in line 2,

If the information is available at the second output of code receiver 6, it is compared with the own code signal previously recorded in memory element 8. If, as a result of the comparison, the identity of these code signals (the code signal coming from line 2 and the own code of memory element 8) is not detected, the logic processing element 9 pulls the control pulse through AND 10 and into switch 5 which turns off the phone 5.

Switch 7 is a relay with movable and fixed contacts, by means of which, when a control pulse arrives, the telephone apparatus switches from line 2 to the signaling state generator 11 for signaling. The output signal of the occupation generator 11 in the event of line 2 being switched is switched by means of the switch 7 to the telephone set 5. If the receiver is picked up, then the sequence of signals that signal the 30. occupation condition of the generator can be reduced.

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Each telephone has two code signals. One beep

Signal - for selective conversation.

The element 12 of the logical signal processing, ensuring the secrecy of the conversation, and the element 9 of the logical signal processing evaluate these calls. If this call is evaluated as a secret call, then the telephone unit 5 is disconnected from line 2 using element 10 I.

If this call is evaluated as open, all telephone sets 5 remain connected to line 2.

50

If the code signals coming from line 2 coincide with the own code signals of the memory element 8, the telephone unit remains connected to line 2; if these code signals do not coincide, the signal processing element 9 causes the control signal to switch 7 and the telephone apparatus 5 is disconnected from line 2.

Claims (1)

Invention Formula A telephone communication system containing n subscriber stations connected in parallel to the subscriber line, each subscriber station containing a ringing signal unit connected to the subscriber line to which the information input of the selective unit is connected, the output of which is connected to the telephone set, which controls the selective output. the unit is connected to the input of the sending signal block, while the selective unit contains a code receiver and a switch, characterized in that, in order to prevent the possibility of carrying nktsionirovannogo .proslushivani doubletalk, the output ringing sending unit is connected to the control input of the selective block in which administered sequentially soeSostavitel L.Timoshina Editor L.Veselovska Tehred N.Gluschenko. Proofreader L. Pilipenko Order 1327/59 Circulation 639Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4 a memory element, a logical signal processing element, and an AND element, the inverse output of which is connected to the control input of the switch, to the first fixed contact of which a generator is connected, to the INPUT of which a second output of the element of logical signal processing is connected, to the second input of which the first output of the code receiver is connected, to the input of which the second fixed contact of the switch is connected and it is the information input of the selective unit that controls the input of which is the control input of the logical signal processing element, and the second output of the code receiver is connected via an additional element of the logical signal processing to the second input of the AND element, the moving contact of the switch being the output of the selective unit.