JPS585556B2 - Remote station control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remote station control system, and particularly to mutual communication control within a remote station.

Conventional methods for handling calls between remote stations include (a) a method in which the remote station is treated as a simple concentrating layer, and all calls between remote stations are realized via the master station switching equipment;

(Example) Normally, calls are made between remote stations via the master station switching equipment, but this is a method in which calls are made between the remote stations only when there is a failure in the trunk line between the master station and the remote station.

(c) A method in which mutual communication is always carried out within the remote station.

There is.

In method (b), calls within the remote station cannot be secured in the event of a trunk line failure or failure of the master station equipment, and because calls within the remote station are normally routed through the master station, an additional trunk line is required. There are drawbacks.

The method in (b) also requires an additional relay line, which is the same as in (b).

In method (c), in order to have the remote station perform mutual communication between remote stations at all times, the mutual communication equipment within the remote station is made redundant, such as by using a duplex system with regular equipment and standby equipment, from the viewpoint of reliability. This requires a system configuration and is economically inferior to a non-redundant system configuration.

The present invention enables inter-remote communication even in the event of a trunk line failure between a master station and a remote station or a failure of the master exchange equipment by equipping a remote station with an intra-remote communication device. By using it even during normal times, it is possible to reduce the number of relay lines between the master station and remote stations, and furthermore, the mutual communication device within the remote station enables mutual communication within the remote station with the master station switching device when the same device fails. The present invention provides a remote station control system that enables economical use of inter-remote communication equipment on the remote station side by having an automatic switching function to the master exchange equipment.

The remote station switching device in the remote station control system of the present invention does not require a redundant system configuration such as a regular/standby system.

That is, the remote station has an inter-remote intercommunication device without a backup, which handles normal inter-remote communication, while the master exchange device can be used to handle inter-remote exchange in the event of a failure of the above-mentioned device without a backup. By providing an automatic switching means that bypasses the intercommunication equipment at the remote station and connects directly to the trunk line, it basically allows the switching process at the remote station to be carried out even when the intercommunication equipment at the remote office fails, although this will reduce the level of service. It is secured.

Also, as a matter of course, since normal inter-remote communication is handled within the remote station, inter-remote inter-office communication is ensured even in the event of a failure in the trunk line between the master station and the remote station, or in the event of a failure in the master exchange equipment.

Furthermore, since normal inter-remote calls are handled within the remote station, the trunk line between the master station and the remote station is, in principle, a call line that corresponds to outgoing calls from within the remote station area and incoming calls within that area. The number of trunk lines can be reduced compared to a system in which communication between remote stations is normally carried out by a master station.

Note that various modifications can be considered as to where in the remote exchange device the automatic switching means is placed.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a remote control system diagram showing the operation of the present invention, which includes a line concentrator 4 that concentrates subscriber lines of a remote station, and a line concentrator 4 that connects the subscriber lines from the line concentrator 4 to an intercommunication device in the remote station and a master station. It has a switching device 5 for switching the pull-in to the subscriber, receiving call/dialing information from the subscriber, determining whether a call needs to be made within the remote station or to the master station, and other functions necessary for basic exchange operations. , further collects fault information within the remote station, makes a judgment to switch the subscriber line to the master station side as necessary, and is constituted by an intra-remote station mutual communication device 3 that does not have a redundant configuration.

For example, during normal times, mutual communication between remote stations is performed by subscriber SUB-A.
One line concentrator 4 - link l1 - tto break contact - remote station intercommunication device 3 - t20 break contact - link l2
This is carried out along the route of one line concentrator 4 and one subscriber SUB-B.

Therefore, the trunk line 14,l! between the master station and the remote station! Even in the event of a failure in the main station converter 2 or in the case of a failure in the master station conversion device 2, mutual communication within the remote station is ensured.

In the event of a failure in the remote station intercommunication device 3, the switching device 5, which constantly or periodically monitors the normal operation of the device using a known status display monitoring circuit (not shown), detects the failure in the device and By immediately operating the switching contacts in the switching device by known means based on the fault information to ensure inter-office communication, inter-office communication between subscribers SUB-A, 4-link L1-t, .

This is carried out along the route of make contact-tit make contact-to-relay line l, one master station switching device 2-reply line l4-121 make contact-t20 make contact-link l2, line concentrator 4-subscriber SUB-H.

In addition, in the system shown in FIG.
Connection is made through the following route: B-A line concentrator 4 - link 11t to break contact - remote intra-office mutual communication device 3 - t21 break contact - trunk line 14 - master station switching device 2.

Here, in the event of a failure in the remote station mutual communication device 3, for example, the route from subscriber SUB/A to line concentrator 4 to link l1 to make contact to tll make contact to trunk line l to one parent exchange device 2 is used. The connection is established via the mutual channel within the master exchange by the same exchange operation as the subscriber's own intra-office connection operation.

FIG. 2 shows another embodiment of the present invention, in which the switching device 5 is connected to the subscriber S.
By placing it between the UB-A-SUB-Z and the line concentrator 4, normal inter-station calls can be made between the subscriber SUB-A-Z and the line concentrator 4.
t1o break contact - line concentrator 4 - link l1 - remote station intercommunication device 3 - link l2 - line concentrator 4 - subscriber S
Intercommunication between specific subscribers within a remote station via the UB-B route when the remote station mutual communication device 3 or the line concentrator 4 fails does not go through the line concentrator or the remote station mutual communication device, for example, the subscriber SUB "A-jlo make contact - tll make contact - trunk line l5 - master station switching equipment 2 - trunk line" 4-121 make contact - t20 make contact - directly accommodated in the master station switching equipment via the route of subscriber SUB-Z The connection is made using the same switching operation as the subscriber's own intra-office connection.

Furthermore, FIG. 3 shows another embodiment of the present invention, in which when the remote station intercommunication device 3 fails, the switching device 5 ensures the remote station switching function in the master station switching device 2, and furthermore, when there is a failure in the line concentrator 4. In this case, the switching device 6 ensures that the switching process for a specific subscriber is passed through the master switching device 2.

That is, in FIG. 3, normal intra-remote communication is carried out by, for example, subscriber SUB-A-t3o break contact-concentrator 4-tst break contact-link 1-tlo break contact-remote inter-communication device 3-t2o. This is carried out along the route of break contact - link 12-141, break contact - line concentrator 4 - subscriber SUB-H.

Now, if both the remote station mutual communication device 3 and the line concentrator 4 are out of order, the remote station specific subscriber mutual communication is limited to subscriber S.
UB・A-t30 make contact - t3, make contact - link l, tlO make contact - tll make contact - relay line l
7-Main exchange device 2 - Trunk line l6-121 Make contact - t20 Make contact - Link l2-t41 Make contact - t
4o Make contact 1 Follow the path of subscriber SUB-Z.

Note that the line concentrator referred to in the present invention is SD (SpaceDi).
vision) or TD (Time Division)
) terminals, for example, a switch accommodating subscriber lines and trunk lines, and the switch includes means for multiplexing or concentrating the incoming lines and connecting them to a master station or a remote station intercommunication device; May also include analog/digital conversion.

The time division remote station device of the present invention shown in FIG. 4 is an application of the remote station control system shown in FIG. 1, and its operation is the same as that shown in FIG. 1.

That is, in FIG. 4, mutual communication between remote stations during normal times is as follows:
For example, subscriber SUB-A one line concentrator 4-link l1-t
to break contact - remote office intercommunication device 3 - 120 break contact - link 12 - line concentrator 4 - subscriber SUB -
This is done by route B.

On the other hand, when the remote station intercommunication device 3 fails, the switching device 5
Intercommunication within the remote office is carried out, for example, by the operation of the switching contacts in the subscriber SUB-A - concentrator 4 - link 71 - tto make contact - tll make contact - direct transmission interface circuit DTI - trunk line l, - master exchange 21 trunk line l
This is done in the path of 4-direct transmission interface circuit DT-t2, make contact-t20, make contact-link 12, line concentrator 4-subscriber SUB-B.

The remote station device of the present invention shown in FIG. 5 is an application of the remote station control system shown in FIG. 2, and its operation is the same as that shown in FIG. 2.

That is, in FIG. 5, mutual communication within a remote station during normal operation is performed by, for example, subscriber SUB-A-t1o break contact - line concentrator 4 - link l1 - intercommunication device within remote station 3 - link l2
This is carried out along the path of one line concentrator 4 and one subscriber SUB-B.

On the other hand, when there is a failure in the mutual communication device 3, the operation of the switching contacts in the switching device 5 allows mutual communication within the remote station, for example, to the subscriber S.
This is carried out along the following route: UB-A-t1o make contact-t11 make contact-link l6-master exchange device 2-link l5-t21 make contact-t20 make contact-subscriber SUB-D.

As explained above, the present invention has a structure that includes a mutual communication device within a remote station and an automatic switching means in the event of a failure of the device. Securing calls.

(Ex) Reduction of the number of trunk lines within the master station and remote stations.

(c) There is an effect that economicalization can be achieved by the non-redundant configuration of the mutual communication device for remote stations.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the operation of the present invention, and FIGS. 2 and 3 are block diagrams having the same principle as the operation shown in FIG. 1, but with different parts provided with switching means.
FIG. 4 and FIG. 5 are diagrams showing an application example of the present invention. 1...Remote station switching device, 2...Main station switching device, 3...Remote station mutual communication device, 4...
...Concentrator, 5,6...Switching device ALC
... Line circuit, LCSW ... Line concentration switch, CODEC ... Code and decoder, D
TI・・・Direct transmission interface circuit, MU
X...Multiplexer, DMUX...
・Demultiplexer, T...Time switch, LLN...Line link network, TLN
...Trunk link network, TRK...
····trunk.

Claims (1)

[Claims] 1 In a remote station control system consisting of a master station switching device and a remote station switching device controlled by the master station switching device, mutual communication within the remote station is possible even in the event of a relay line failure between the master station and the remote station. In the event of a failure between the communication device and the mutual communication device within the remote station, the master station switching device will directly connect the call path of the subscriber accommodated at the remote station to the relay line between the parent station and the remote station in order to ensure mutual communication between the remote station and the remote station. 1. A remote station control system comprising automatic switching means for connecting.