JPS6249753A - Subscriber accommodation switching system - Google Patents

Abstract

PURPOSE:To prevent misjudgement when no response is given for some reason and abnormal congestion caused by a system-downing exchange unit, by judging that the exchange unit has system-down when no response is given from all testing circuits of the exchange unit. CONSTITUTION:A monitoring center 11 periodically or at any time actuates exchange units 12-1-12-n through plural testing circuits 14-1-14-n, respectively. The central controllers 17-1-17-n of the exchange units 12-1-12-n catch automatic responding trunks 18-1-18-n and cause the trunks 18-1-18-n to make responses to the testing actuation to the monitoring center 11. Upon receiving the responses, the center 11 judges that the test-actuated exchange units are normal. When no response is given to the actuation made through plural testing circuits, it is judged that a system down takes place. Namely, the case where no response is made to single testing actuation is not judged as a system down.

Description

[Detailed Description of the Invention] [Summary] When the system of a replacement unit goes down, an important subscriber accommodated in that replacement unit is switched to be accommodated in another healthy replacement unit, and the issue regarding the important subscriber is stopped. This allows you to receive calls.

[Industrial application field]

The present invention relates to a subscriber accommodating switching system that switches only important subscribers from a system-down replacement unit to a healthy replacement unit.

If a failure occurs in a terminal exchange, all subscribers accommodated in that exchange will be unable to make or receive calls. If the subscribers include socially important subscribers, the problem becomes more serious. Therefore, it is desired that important subscribers be able to make and receive calls even in the event of a switch failure.

[Conventional technology]

Switching equipment has improved reliability by duplicating its important parts, but the system may still go down due to the spread of a failure. If the system of an exchange goes down, all subscribers accommodated in that exchange will be unable to make or receive calls. In order to detect such a system down or an abnormal state before a system down, a method is also adopted in which regular tests are performed to confirm the normality of the exchange. In this system, when an abnormality is detected through periodic tests, maintenance personnel are notified and the abnormality is repaired.

Therefore, even if the system goes down, repair work can be started relatively quickly, but subscribers will be unable to make or receive calls until the repair is completed.

[Problem that the invention seeks to solve]

If the system of an exchange goes down as described above, important subscribers accommodated in that exchange will be unable to make or receive calls until repairs are completed, just like regular subscribers.
This can be a big problem. In order to solve this problem, it may be possible to duplicate the entire exchange and subscriber lines, but this is economically difficult to realize.

The purpose of the present invention is to ensure that important subscribers can receive and receive calls by switching from an exchange whose system is down to a healthy exchange.

[Means for solving problems]

The subscriber accommodating switching system of the present invention is for switching and accommodating important subscribers from a system-down switching system to a healthy switching system, and will be explained with reference to FIG. 1. -1 to 2-n are placed in the same station building or in the same area, and each has a plurality of test lines 4 between it and the monitoring center 1, and important subscribers are , configured to be switched connected to a replacement unit.

The monitoring center 1 activates each exchange unit 2-1 to 2-n periodically, for example, via the test line 4, and the activated exchange unit responds by an automatic response function. The monitoring center 1 determines that the replacement unit is normal if there is a response from the activated replacement unit, and determines that the system of the replacement unit is down when there is no response from all test lines 4 of the replacement unit. Then, the monitoring center 1 uses the switching means 3 to switch and accommodate the important subscriber accommodated in the exchange unit judged to be system down to another healthy exchange unit. Subscriber information is transferred from the monitoring center 1, and calls can be made and received as if the important subscriber had been accommodated in the exchange unit from the beginning.

[Function]) The monitoring center 1 does not judge whether or not the system of a replacement unit is down based on no response from a single test line, but does not determine whether the system is down if there is no response from all multiple test lines. This prevents misjudgment when there is no response for some reason. In addition, by switching an important subscriber's system from a faulty switching unit to a healthy switching unit, the important subscriber can make and receive calls through the healthy switching unit, and can always make important calls or emergency calls. It becomes possible to guarantee this.

〔Example〕

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

FIG. 2 is a block diagram of an embodiment of the present invention, in which exchange units 12-1 to 12-n are connected to networks 16-1 to 1
5-n, central controllers 17-1 to 17-n, and automatic response trunks 18-1 to 18-n that constitute an automatic response function.
A plurality of test lines 14-1 to 14-n are provided between the monitoring center 11 and the monitoring center 11, respectively. A general subscriber 19 is accommodated in each of the exchange units 12-1 to 12-n, and an important subscriber 20 is accommodated in the exchange unit 12-1. 20 important subscribers
is configured to be switched and housed in the exchange unit 12-1 or the exchange unit 12-n via the switching circuit 13.

The switching units 12-1 to 12-n are installed in the same station building or in the same area, and therefore, the important subscribers 20 are connected to each other via the switching circuit 13. Replacement unit 1. 12-1 or exchange unisol
-12-n can be switched and accommodated. Also switching circuit 1
Reference numeral 3 is composed of a relay or the like, and is switched by a switching control signal applied from the monitoring center 11 via a control line 15.

The monitoring center 11 has each replacement unit 12-1 to 12-n.
The subscriber information managed by the central control devices 17-1 to 17-n is collected and held at the time of system start-up.

Also, each of the exchange units 12-1 to 12-n is activated periodically or at any time via a plurality of test lines 14-1 to 14-n. Replacement Unisol l-12-1~12
-n central controllers 17-1 to 17-n identify that the automatic response trunks 18-1 to 18 have been activated from the monitoring center 11 via the test lines 14-1 to 14-n.
-n is captured and a response to the test activation is sent to the monitoring center 11. The monitoring center 11 receives this response and determines that the test-activated replacement unit is normal. Also, if there is no response at all to activation via multiple test lines, it is determined that the system is down.

For example, if a response is not sent from the multiple automatic response trunks 18-1 of the replacement unit 12-1 when the replacement unit 12-1 is activated from the monitoring center 11 using multiple test lines 14-1 in sequence, , the monitoring center 11 is not due to a simple malfunction of the automatic response trunk 18-1,
If it is uni, it is determined that the system of the replacement unit 12-1 is down due to a failure in the network 16-1 or the like. That is,
The system is not determined to be down when there is no response to a single test activation, but rather the system is determined to be down when there is no response to all test activations for the number of test lines.

When the monitoring center 11 determines that the system of the replacement unit 12-1 is down, it controls the switching circuit 13 via the control line 15 and switches the important subscriber 20 from the replacement unit 12-1 whose system has gone down to the healthy replacement unit 12-. The subscriber information including the telephone number and the like of the important subscriber 20 is transferred to the central control unit 17-n of the exchange unit 12-n. The central control device 17-n can control incoming and outgoing calls based on the telephone number and accommodation location information of the important subscriber 20.

In this case, the upper station of the switching unit 12-1 that initially accommodates the important subscriber 20 is notified of the switching unit 12-n that accommodated the important subscriber 20, and the incoming call to the important subscriber 20 is notified. A notification may also be sent from the monitoring center 11 to connect the call to the switching unit 12-n.

The switching circuit 13 is controlled by the monitoring center 11, and can be installed on the important subscriber 20 side. In this case, the subscriber line becomes duplicated. Moreover, if it is provided on the exchange unit 12-1 side, it is possible to switch to the healthy exchange unit side when the system goes down, while keeping the conventional subscriber line state.

Also, at the monitoring center 11, each replacement unit 1 is
2-1 to 12-n are tested to determine whether or not the system is down. It is also possible to impose regulations.

〔Effect of the invention〕

As explained above, the present invention provides automatic response trunk 18
-1 to 18-n, etc., each having a plurality of test lines 14 between the plurality of exchange units 2-1 to 2-n, 12-1 to 12-n and the monitoring centers 1 and 11.
-1 to 14-n are set up, and each replacement unit is activated from the monitoring center using multiple test lines in sequence, and if there is a response from the activated replacement unit, it is determined to be normal, and the replacement unit is activated. When there is no response to activation by all test lines, it is determined that the system is down, and the important subscriber 20 accommodated in that replacement unit is switched to a healthy replacement unit, and the system of the replacement unit is Even if the system is down, important subscribers can still make and receive calls through the healthy switching unit.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the principle of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention. 1.11 is the monitoring center, 2-1 to 2-n, 12-1 to 1
2-n is a switching unit, 3 is a switching means, 13 is a switching circuit, 4.14-1 to 142n is a test line, 15 is a control node line, 16-1 to 16-n is a network, 17-1 to 17
-n is a central control unit, 18-1 to 18-n are automatic response trunks, X9 is a general subscriber, and 20 is an important subscriber.

Claims (1)

[Claims] A plurality of exchange units (2-1 to 2) having an automatic response function
- n), a monitoring center (1) each having a plurality of test lines, and switching means (3) for switching from a switching unit accommodating an important subscriber to another switching unit, (1) to each replacement unit (2-1 to 2-n) via the test line, the activated replacement unit responds by an automatic response function, and the monitoring center (1)
If there is a response, it is determined to be normal, and if there is no response from all test lines of the replacement unit, the system is determined to be down, and the important subscriber accommodated in the replacement unit is transferred to the switching means (3). A subscriber accommodating switching system characterized by switching and accommodating subscribers to other switching units.