JPS63155855A - Maintaining and testing method for remote subscriber's device - Google Patents

Abstract

PURPOSE:To make a maintenance and a testing at a remote place possible without necessitating the operation of an exchange station by providing one spare subscriber's circuit and a monitoring telephone set and a maintenance and testing console box for controlling. CONSTITUTION:The control of a subscriber's circuit group is switched from a usual route to a maintenance route by a manual operation from a maintenance console box 21. Namely, a switch 11 is made into OFF, and all the switches 10, 13, 14 are made into ON by a line control from the subscriber's circuit main body 12, which has miscellaneous functions such as a power supply, a monitoring, a two wire-tour wire conversion and a CODEC, etc. Besides, the spare subscriber's circuit main body 15 is made into an operation-ON, and the subscriber's circuit main body 12 is made into an operation-OFF. Thus, the telephone set 3-a cable 2-the switches 10,14,13-the spare circuit main body 15 are connected, and the telephone set 3 is considered to have been included within the spare subscriber's circuit 16. As the result, a speech between a subscriber through the telephone set 20 for maintenance comes to a possible state, and it can be confirmed by speaking whether the cable 2 and the telephone set 3 are normal or not.

Description

[Detailed Description of the Invention] [Summary] In order to smoothly carry out failure self-diagnosis of a plurality of subscriber circuits prepared in a remotely installed subscriber device, one spare subscriber circuit and a monitor telephone are prepared. This allows a series of maintenance operations to be carried out in remote locations without requiring full operation of the switching center.
This made testing possible.

[Industrial application field]

The present invention relates to a method for maintaining and testing remotely installed multiple subscriber circuits.

A digital exchange has a predetermined service area (line length of subscriber cable)9, and attempts to provide a predetermined switching function (service) to subscribers (that is, telephones) within the area. There is. However, some subscribers may be located outside this area (especially in sparsely populated areas), and special repeaters may be required to provide these subscribers with the same service as those within the area. It was necessary to prepare a special type of subscriber cable. However, from the economic point of view of accommodating more subscribers with fewer digital exchanges, the normal service area (line resistance 150
It is desirable to provide service to these subscribers, who will be located beyond 0.1 ohm), in an economical manner.

[Conventional technology]

In order to realize such a request, the present inventors first developed the third
A remote subscriber device as shown in the figure is proposed.

In FIG. 3, 22' is a remote subscriber unit.

The remote subscriber equipment 22' accommodates a plurality of subscriber circuits 3', each accommodating a subscriber line 12', and a multiplex transmission line 30' connecting between the digital exchange and the digital exchange. It is fully equipped with a synchronizer R27' that establishes synchronization, and a signal relay device 23' that supplies various AC signals to the subscriber circuit 3' based on control signals transmitted from a digital exchange in a remote location. Furthermore, each subscriber circuit 3
a demultiplexing device 100' that time-division multiplexes and demultiplexes the digitally encoded voice signals, supervisory signals, and control signals transmitted and received by ', and the control signals transmitted from the digital exchange to the signal relay device 23'. ing.

A remote subscriber 22' is connected to a plurality of telephones 1 in remote locations.
', and the telephone 1' is installed near the subscriber within a predetermined distance!
12'ti to each subscriber circuit 3' within the remote subscriber unit 22'. The digitally encoded voice signals transmitted and received by the subscriber circuit 3' to and from the network of digital exchanges are time-division multiplexed by a demultiplexer [100' and synchronized by synchronizers 27' and 28'. The signal is transmitted via the multiplexed transmission path 30'. Also, the calling signal etc. sent from the subscriber circuit 3' to each telephone 1' is based on instructions transmitted from the digital exchange.
A signal relay device 23' supplies the signal.

Therefore, compared to, for example, the remote control switching equipment 2', the remote subscriber equipment 22' does not have a line concentration function and does not require a full-fledged signaling device, so the configuration is simple and small, making it significantly more economical. is possible.

[Problems to be solved by the invention]

Maintenance is also provided for remote subscriber equipment as shown in Figure 3.

Test t-needs to be carried out. However, applying the conventional method of providing special maintenance/testing equipment to each remote subscriber's equipment and performing maintenance tests under control from the switching center is still insufficient in terms of economic efficiency. It is.

That is, in order to provide an economical remote subscriber device, it is essential to provide an economical maintenance and testing method.

[Means for solving problems]

In a remote subscriber device including a PCM multiplexing circuit 4 installed at a remote location from a switching center where a digital communication path is installed, a plurality of It is equipped with a subscriber circuit 1 and a backup subscriber circuit 16 configured with the same hardware as these subscriber circuits 1, and all of the plurality of subscriber circuits 1 and the backup subscriber circuit 16 connected individually to each telephone set are provided. Prepare a switch 10.11 that can be connected in multiple ways. If a failure occurs in the connection route between any one of the plurality of subscriber circuits l and the telephone, the telephone connected to the subscriber circuit is connected to the standby subscriber circuit via the switch 22.23. The backup circuit performs various fault diagnosis to determine whether the fault is in the subscriber circuit or in the telephone and the subscriber cable connecting the telephone and the subscriber circuit. If the telephone whose failure is caused by the subscriber circuit and the subscriber cable are normal, the monitor telephone 201c is connected to the connection point 18 between the failed subscriber circuit and the backup subscriber circuit via the previous switch, and communication with the subscriber is established. Confirm that the connection between the spare subscriber circuit and the telephone set after the connection change is in a normal state by making a call between the two parties.

Further, this can be realized by operation from a maintenance console box connected to the t-PCM multiplexing device 4 that controls a series of connections to the backup subscriber circuit.

[Effect]

In order to smoothly perform failure/diagnosis of multiple subscriber circuits in remotely installed remote subscriber equipment, prepare one spare subscriber circuit, a monitoring telephone, and a maintenance/test console box for control. In particular, it made it possible to carry out maintenance committee tests in remote locations without requiring the operation of an exchange.

〔Example〕

FIG. 1 is a block diagram for realizing the maintenance and testing method for remotely installed subscriber equipment of the present invention. ol is a subscriber circuit;
1 is a subscriber cable, 3 is a telephone set, 4 is a PCM multiplexer, 5 and 6 are signal converters for connecting remote subscriber equipment and a master station, 7 is a digital communication path, 8 is a remotely installed subscriber equipment, 11 Reference numeral 12 indicates the subscriber circuit main body and a telephone disconnection/off switch, and 12 indicates the subscriber circuit main body having various functions of power supply, monitoring, two-wire to four-wire conversion, and C0DEC. However, the figure only represents one subscriber, and it is assumed that the remotely installed subscriber device 8 is equipped with a plurality of subscriber circuits (having the same configuration as 1), which are not shown. Further, 13 is a switch having the same function as 11, 14 is a switch having the same function as 10, 16 is a standby subscriber circuit having the same configuration as 1, and 17 is connected to the main station via 4 to 6 for remote installation. 18 is a selection circuit intended to switch between the normal route connecting the subscriber equipment and the maintenance test route with the maintenance console at the remote station. 19 is a connection point with a maintenance console 21.

By manual operation from the maintenance console 21, the control of the subscriber circuit group is switched from the normal route to the maintenance route.
11 is off due to circuit control from 2, 10, 13 and 14
are all turned on, 15 is on operation, 12 is operation off, by a series of 0 or more operations, telephone 3 - cable 2
-10-14-13-15 connections are completed. t#)
The telephone set 3 is housed in the backup subscriber circuit 16, and the maintenance telephone set 20 becomes ready for communication with the subscriber, and it is possible to confirm by telephone whether or not 2 and 3 are normal through this route. . As described above, it is possible to ensure the same level of maintainability for subscribers without having to install a special maintenance number test device that was required in the conventional method.

FIG. 2 is a system configuration diagram according to an embodiment of the present invention. The same numbers in the figure as in FIG. 1 have the same structure and functions. 36 and 37 are signal lines for controlling the circuit operation of the subscriber circuit group, and the overload wires transmit signals from the master station to the subscriber circuit group, but during maintenance, the maintenance line has the same data format as the normal route. transmit signals from the route. Reference numeral 22 is a circuit for switching and selecting two routes, normal use and maintenance use, and is composed of AND gates 23 and 24. The maintenance route is used only when all the air signals are applied. At this time, only the corresponding subscriber circuit 1 and the backup subscriber circuit are on the maintenance route, and the maintenance G control signal line 30 is set to support the subscriber circuit so that all other subscriber circuits remain on the normal route. prepare.

28 and 29 are for maintenance the clock signal and synchronization signal sent from the master station; signal lines for transmitting to the console 21. With these two signals, the control signal from the maintenance route is the same as the control signal from the normal route. It becomes possible to make it into a data format. 38 and 39 are signal lines that contain signals indicating the regeneration status of the subscriber circuit group. 026 is a signal line that uses the two clock Φ synchronization signals mentioned above to set the timing evenly and joins in the same data format as the normal route. A control circuit for controlling the maintenance circuit group Ye II H, 27 is a manual board consisting of a display function and various electric keys, and the aforementioned maintenance connection router is formed by operating the various electric keys 27 and 25.

31 and 32 are capacitors for blocking the flow of DC 1 from the subscriber circuit, 33 is a transformer for extracting and inserting only voice, 34 is a transmitter/receiver, and 35 is for ensuring the operation of 34. It is a battery. 34 has a high input impedance with respect to audio frequencies and is equipped with an audio amplification circuit. As mentioned above, since the timing is created using 28 and 29, it is possible to select a circuit-compatible route using z2 and 25, which are prepared for subscriber circuits, using the same data format as the normal route. Since the connection is made with high impedance to voice, there is no insertion loss, and the corresponding telephone can be accommodated in the backup subscriber circuit, so it does not cause any inconvenience to other subscribers and can be maintained using simple hardware. It becomes possible to provide services.

〔Effect of the invention〕

According to the present invention, conventional maintenance and testing is possible by using one of the subscriber circuit groups as a backup without preparing any special maintenance/testing equipment.

[Brief explanation of the drawing]

Fig. 1 is a system configuration diagram explaining the present invention in detail;
The figure is a system configuration diagram showing one embodiment of the present invention, and FIG. 3 is a configuration diagram of a new remote subscriber device. 〼MJ770)

Claims (1)

[Claims] 1. In a remote subscriber device installed at a remote location from a switching center where a digital communication path is installed, a plurality of subscriber circuits equipped with a function for individually connecting telephone sets and the above-mentioned A first backup subscriber circuit having the same configuration as the subscriber circuit, and a switch capable of connecting each of the plurality of subscriber circuits and the backup subscriber circuit in multiple ways, one of the plurality of subscriber circuits. If a failure occurs in the connection route between one subscriber circuit and a telephone, the telephone connected to the subscriber circuit is reconnected to the backup subscriber circuit via the switch,
A method for maintaining and testing a remote subscriber device, characterized in that it is determined by the spare subscriber circuit whether the failure point is in the subscriber circuit or in the telephone and the subscriber cable connecting the telephone and the subscriber circuit. 2. When it is determined that the cause of the failure is in the subscriber circuit, a monitor telephone is connected via the switch to enable communication with the subscriber. Maintenance and testing methods for the remote subscriber equipment described.