JPS5936496A - Intra-office call exchange system of remote control small capacity time division exchange - Google Patents

Abstract

PURPOSE:To attain the connection of intra-office call in a slave station, when the control from a master station is impossible, by connecting fixedly a channel between an encoding circuit and a decoding circuit via an interconnection time switch. CONSTITUTION:A controller 113 receives control information from a master station via an interface 112 and controls the setting of a channel to the master station via a subscriber circuit 101, transmission and receiving line concentrating circuits 102, 103, coding and decoding circuits 104, 105, multiplexing and separating circuis 106, 107, transmission and receiving interconnection time switches 108, 109, and separation and multiplexing circuits 110, 111. If the control from the master station is impossible, the output side of the transmission and receiving interconnection time switch 108 is connected to the separation circuit 107 via a changeover switch 301. The control circuit 113 controls a function circuit shown in the figure via the channel so as to connect mutually between subscribers SUBA and SUBB.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for enabling calls within a remote station in a small-capacity remote-controlled time-division exchange when switching connection processing under master station control becomes impossible.

Generally, in villages dotted around cities, remote-controlled time-division switches (hereinafter referred to as slave stations), which are composed of the concentrator stage of a master station time-division exchange installed in the city (hereinafter referred to as master station), are installed. The lines are concentrated under control from the station, connected to the master station via digital lines, and exchanged. However, when a failure occurs and control from the master station becomes impossible, it becomes impossible to provide exchange services to subscribers whose slave stations are busy, which is undesirable in terms of exchange services.

As a countermeasure against this problem, conventionally, a device (hereinafter referred to as an autonomous function device) that performs switching connection control for intra-slave-station calls is installed in the slave station, and when such a failure occurs, the switching connection control for intra-slave-station calls is performed. This avoids interruptions in exchange services.

FIG. 1 shows an example of a conventional method. In the figure, 1 indicates an autonomous functional device. Father, SUB is a subscriber telephone, l A subscriber circuit that includes a function to convert an old two-wire subscriber line to a four-wire system of a sending line and a receiving line, and 102 and 103 are for example 120 line subscriber lines. This is a subscriber line concentration circuit that concentrates subscriber lines into 30 lines, 102 for the transmitting side line and 103 for the receiving side line. 104 is an encoding circuit that converts analog signals of 30 lines into 30 multiplexed PCM signals, lO5 is a decoding circuit that converts 30 multiplexed PCM signals into 30 lines of analog signals, and 106 is, for example, a 30 multiplexed PCM signal. A multiplexing circuit that multiplexes four transmission lines into 120 multiplexed transmission lines; 07 is a multiplexing and demultiplexing circuit that demultiplexes the 120 multiplexed transmission lines, which is the opposite of 106; 108 and 109 are for confounding communication paths of 120 multiplexed transmission lines, which will be described later. 108 is a confounding time switch composed of a high-speed memory, and 109 is for a sending line, and 109 is a receiving line. 110 is a demultiplexing circuit that separates a 120-multiplex transmission line into, for example, 5 24-multiplex transmission lines;
Contrary to 110, 111 connects 24 multiplexed transmission port m5 lines to one
A multiplexing circuit for multiplexing into 20 transmission lines, 1j2 is an interface circuit with the transmission line for the master station. and,
Reference numeral 113 is a control device that controls the transmission and reception of control information with the master station or the autonomous function control device 115 described later, controls the execution of received information, detects changes in the subscriber circuit 101, and collects information such as receiving dial pulses. be.

115 in the autonomous function device 1 is an autonomous function control device that performs switching connection processing control for calls within the slave station when switching connection by master station control becomes impossible; 116 is an autonomous function control device that controls four 120-multiplex transmission lines; 117 is a multiplexing and demultiplexing circuit that performs demultiplexing in the opposite manner to 116, and 118 is a time switch composed of high-speed memory, which connects the communication path from the multiplexing circuit 116 to the multiplexing circuit. An exchange connection is made between the communication path and the communication path to the communication separation circuit 117.

The father 114 connects the reception transmission line from the master station to the multiplexing and demultiplexing circuit 107 when the master station control is normal, and connects the multiplexing and demultiplexing circuit 107 of the autonomous functional device 11 when the master station control is not possible. This is a switching circuit that connects the separation circuit 117 and the multiplexing/demultiplexing circuit 107.

FIG. 2 shows an example of the confounding situation between the communication paths of the encoding/decoding circuits 104 and 105 of the confounding time switches 108 and 109 of FIG. 1 and the communication path of the transmission line to the master station. In the diagram, 2
00, 201', 202, 203 are encoded/
The decoding circuit side communication paths each have 30 communication paths, and 210
, 211 , 212 , 213 , and 214 are communication paths of transmission lines to the master station, each having 24 communication paths. The communication path 200 is divided into 5, that is, each of the 6 communication paths is connected to the communication path 21.
0, 211, 212, 2]3, and 214. The same goes for the communication paths 201, 202, and 203, and the six communication paths are 210, 211, and 2, respectively.
12, 213, and 214. As a result, even if, for example, up to four transmission lines to the master station fail, it is possible to provide switched connection services to all subscribers using normal transmission lines.

However, this conventional autonomous function device 1 corresponds to a small-capacity exchange control device and performs complicated exchange processing. Therefore, it is economically disadvantageous to install an autonomous function device in a small-capacity remote-controlled time-division exchange, which is the object of the present invention.

The present invention has been made in view of this point, and when control from the master station becomes impossible, the communication paths of the encoding circuit and the decoding circuit are fixedly connected via a confounding time switch. It is an object of the present invention to provide a small-capacity remote time-division switching device that is simple and economically advantageous by providing a means for connecting calls within a slave station when control from a master station becomes impossible. It is something to do.

That is, the present invention provides a remote control time-division switch that is connected to a master station via a digital line and that normally handles switching connection processing under control from the master station, with a transmitting side communication path to the master station and a communication path from the master station. By providing a switching circuit that connects the receiving side communication path via a confounding switch circuit that performs fixed communication path confounding,
When switching connection processing becomes impossible under control from the master station, switching connection processing is performed only for calls within the own station.

Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

FIG. 3 is a block diagram showing an embodiment of the local call switching system of the present invention.

The system of the present invention shown in the figure is provided with a switching circuit 301 in place of the autonomous function device [1] in the conventional system shown in FIG. Indicated by code.

The switching circuit 301 is provided on the input side of the multiplexing/demultiplexing circuit 107 on the receiving side, and selectively connects the output of the transmitting side confounding time switch 108 and the output of the receiving side confounding time switch 109 to the multiplexing/demultiplexing circuit 107. It is a circuit. That is,
This switching circuit 301 switches the reception transmission line from the master station to the multiplexing circuit 111, when the control from the master station is normal.
Demultiplexing circuit 1 via receiving side confounding time switch 109
07, and on the other hand, when control from the master station is impossible, the transmitting side confounding time switch 108 and the demultiplexing circuit 10
Connect with 7.

Next, FIG. 4 shows an example of the confounding situation of the communication path of the encoding circuit and the communication path of the decoding circuit at the transmission side confounding time switch pressure when control from the master station becomes impossible. Communication path 1 of the encoding circuit side communication path 400 and communication path 4 of the decoding circuit side
100 communication path 2, etc., and the encoding circuit side communication path 40.
The 00 communication path 2 and the communication path 1 of the decoding circuit side 110 communication path 410 are connected by a confounding time switch constituted by a high-speed memory.

By this 1fij channel, the concentrator circuit 10 in FIG.
Communication paths 1 and 2 of 2 and 103 are connected.

For example, the communication paths between the subscribers accommodated in the line concentrators 102 and 103 are connected to the machine control device 1 to which the JJII person A and the Mfh channel 1 are connected, and the machine control device 1 to which the subscriber B and the Mfh channel 2 are connected.
]3 controls the concentrator circuit.

The voice of subscriber A is connected to the communication path 1 at the transmission concentrator circuit 102, and is connected to the transmission confounding time switch 108 via the encoding circuit 104 and the multiplexing circuit 106. In the confounding time switch 108, as already explained, the communication path 1 of the encoding circuit side communication path 400 is connected to the decoding circuit side communication path 41.
00 communication path 2.

Subscriber A's voice is routed to communication path 2 by confounding time switch 108.
connected to the switching circuit 3011 and the multiplexing and demultiplexing circuit 107,
The decoding circuit 105 is connected to the communication path 2 of the receiving side concentrator circuit 103, and transmitted to the subscriber B. Similarly, the voice of subscriber B is connected to communication path 2 at the transmission side concentrator circuit 102, passes through the encoding circuit 104 and demultiplexing circuit 106, and is connected to communication path 1 at the transmission side confounding time switch 108.
Switching circuit 301, multiplexing/demultiplexing circuit 107, decoding circuit 1
05, it is connected to the communication path l of the receiving side concentrator circuit 103 and transmitted to subscriber A.

This allows communication between two subscribers accommodated in the same line concentrator. In the explanation of this example, it is assumed that there is one 30-pin transmission line, that is, one line concentrator circuit.

Next, FIG. 5 shows an example of the confounding situation in the confounding time switch when there are two transmission lines for 30 polygons. In the same figure, 400 and 401 indicate communication paths on different encoding circuit sides, and 4]0 and 4]1 indicate 40 and 401, respectively.
0 and 401 are shown on the side of the postcoding circuit.

The above-mentioned encoding circuit side communication path 4000 communication path 3 and the decoding circuit side communication path 4 ] 1 communication path 4, and the communication between the encoding circuit side communication path 4010 communication path 4 and the decoding circuit side communication path 410 Route 3 is connected with a confounding switch. Through this communication path, the voice of subscriber A accommodated in the communication path 400 is
A subscriber C is connected to the communication path 3 by connecting the concentrator circuit, and is also connected to the communication path 4 of the socialization circuit side communication path 411 by a connection time switch, and is accommodated in a concentrator circuit different from the subscriber. transmitted to. Similarly, subscriber B's audio is also subscriber A's voice.
This allows communication between subscribers accommodated in different concentrator circuits.

Even if the 30-pin transmission line is 3 or 4 lines, by similarly connecting the interlacing time switches, it is possible to make calls within the same concentrator circuit or between different concentrators, and the third The controller 113 shown in the figure can make calls within its own office simply by controlling the line concentrator circuit at the location where the subscriber is accommodated.

As described above, in the system of the present invention, when control from the master station becomes impossible, it is possible to automatically connect the encoding circuit and decoding circuit via a confounding switch composed of high-speed memory. This has the effect of easily and economically realizing intra-office call connections.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an example of a conventional method, Fig. 2 is a block diagram showing an example of communication path confounding between the communication path of the encoding/decoding circuit and the communication path of the transmission line to the master station, and Fig. FIGS. 4 and 5 are block diagrams illustrating an embodiment of the intra-office call switching system of the present invention, and are block diagrams illustrating examples of connections between the encoding circuit side communication path and the encoding circuit side communication path, respectively. 1...Autonomous functional device lol...Subscriber circuit 10
2... Transmission side concentrator circuit 103... Receiving side concentrator circuit 104... Encoding circuit 105... Decoding circuit 106... Multiplexing circuit 107... Multiplexing and demultiplexing circuit 108... Transmission Side confounding time switch] (19... Receiving side confounding switch 110... Multiplexing/demultiplexing circuit 111... Multiplexing circuit 112... Transmission line interface circuit for master station 1) 3
... Control device 114 ... Changeover switch 115 ... Autonomous function control device 116 ... Multiplexing circuit 117 ... Multiplexing and demultiplexing circuit 118 ... Time switch 200, 201, 202, 203... Encoding/decoding circuit side communication paths 210, 211, 212, 213, 2
14... Master station transmission line communication path 301... Switching circuit 400, 401... Encoding circuit side communication path 4] 0, 4
11...Decoding circuit side communication path Applicant: NEC Corporation Figure 1 Figure 2 Figure 3 533- Figure 5

Claims (1)

[Scope of Claims] In a remote-controlled small-capacity time-division switch that is connected to a master station time-division exchange via a digital line and that shares switching connection processing under control from the master station time-division exchange, the master station time-division exchange forming a switching circuit that connects the transmission side communication path to the master station time division switch and the reception side communication path from the master station time division switch via a confounding switch circuit that performs fixed communication path confounding,
An intra-office call switching system for a remote-controlled small-capacity time-division switch, characterized in that the switch is configured so that when switching connection processing under control from the master time-division switch becomes impossible, switching connection processing is performed only for calls within the own office. .