JPH0740706B2 - Monitoring test information switching method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring test information switching system, and more particularly to a monitoring test information switching system suitable when there are a plurality of remote stations.

[Background of the Invention]

For example, Japanese Patent Laid-Open No. 57-81759 discloses a conventional monitoring switching system. In this conventional method, a failure information transfer device (ALSND) is installed on the remote station side, and a failure information receiving device (ALRCV) is installed on the maintenance exchange side, and a main line is used as a failure information transfer line between these two devices. A backup line is provided, and when a failure in the main line is detected, automatic switching to the backup line is performed in both devices.

In such a conventional method, when a failure notification is made between a plurality of remote stations and a switching office in charge of maintenance, a main line and a backup line are required for each remote station as a failure information transfer line, which results in a high transmission line cost. There is. Further, there is a drawback that a plurality of information receiving devices have to be provided on the side of the maintenance office for the remote station.

[Object of the Invention]

An object of the present invention is to eliminate the need for a dedicated line for monitoring test information transfer, which is required for each remote station, and to eliminate the need to provide an information receiving device for each remote station on the side in charge of maintenance. It is to provide a monitoring test information switching method that is easy to maintain.

[Outline of Invention]

The above-mentioned object is that each of the plurality of remote stations is accommodated in the time-division network of the maintenance exchange through the respective duplicated general digital lines, and the plurality of remote stations are provided on the duplicated general digital line. The monitoring test information transmitted to the time division network in the maintenance exchange through a predetermined time slot is used for the monitoring of the multiplexed remote station through the time division network and on the dual alarm highway. When constantly monitored via the test information transfer time slot, the monitor test information from each of the multiple remote stations is sent via the multiplexed remote station compatible monitor test information transfer time slot on the active alarm highway. When a failure is detected in any of the remote stations while being monitored, only the monitoring test information from the remote station thereafter,
This is achieved by being monitored via the time slot for monitoring test information transfer corresponding to the remote station on the standby alarm highway. That is, when a transmission failure occurs on the working general digital line between the maintenance exchange and any remote station, only the monitoring test information from the remote station, the standby general digital line, and the maintenance exchange. It is designed to be monitored via a time division network in the station and an alarm highway for protection.

Example of Invention

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

FIG. 1 is a block diagram of a maintenance exchange station to which an embodiment of the present invention is applied. In FIG. 1, the exchange 1 in charge of maintenance is
Each of the n remote stations 2 is connected by a general digital line 3. Each digital line 3 is an active highway
3a and spare highway 3b, each working highway
The spare highway 3b and the spare highway 3b are connected to a time division switch 5 via a time division connector 4.

The monitoring / alarm control device 6 is connected to the time-division switch 5 via an alarm highway 8 via a time-division connector 7. The alarm highway 8 is composed of an active highway 8a and a backup highway 8b.

FIG. 2 is a detailed configuration diagram of the monitoring and alarm control device. The active and standby alarm highways 8a and 8b are connected to the selector 9, and the output of the selector 9 is input to the alarm 12 of the maintenance person through the parallel-series / serial-parallel conversion circuit 10 and the failure information detection circuit 11. In the selector 9, the signal of the current spare switching signal line 13 is "H".
When it is, the active alarm highway 8a is selected, and when it is "L", it is switched to the standby alarm highway 8b. The signal line 13 is connected to a time slot unit switching circuit 15 controlled by a timing control circuit 14, and the timing control circuit 14 is provided with a working standby changeover switch (SW _{0 to} SW _n ) 16 provided for the remote station.
Are connected.

With such a configuration, the failure information of each remote station 2 can be transmitted to the maintenance switching center 1 by the specific time slots of the working and protection highways 3 (3a, 3b), ..., As shown in FIG.
Sent to. In the switching center 1 in charge of maintenance, only these time slots are multiplexed and transmitted to the working 8a and the spare 8b of the alarm highway 8 via the time division network such as the time division switch 5.

The timing control circuit 14 sends an "H" signal to the time slot unit switching circuit 15 for each time slot, and the time slot unit switching circuit 15 sends a signal obtained by the OR logic to the signal line 13. As shown in FIG. 4, this signal is a signal that is always at the "H" level, and the selector 9 receives this signal and selects the working side 8a.

Now, for example, when a failure occurs in the remote station 2 of # 0, the failure information detection circuit 11 detects the occurrence of the failure and activates the alarm 12-0. Upon receiving this alarm, the maintenance person knows that a failure has occurred in the remote station 2 of # 0, and the corresponding switch SW ₀
When is turned on, the information is taken into the timing control circuit 14, and the signal of # 0 changes from "H" to "L". Therefore, the output signal of the time slot unit switching circuit 15 is the fifth signal.
As shown in the figure, the signal becomes "L" only during the time corresponding to the first time slot TSO. With this signal, the selector 9 selects the spare highway 8b only for the remote station 2 of # 0.

Even when the remote stations are # 1 to #n, the active highway is switched to the backup highway in a similar manner.

〔The invention's effect〕

According to the present invention, a part of the time slot on a general line can be diverted without providing a dedicated line for transferring monitoring information between a plurality of remote stations and a maintenance exchange, and economical maintenance is possible. Becomes

In addition, the maintenance exchanges are equipped with centralized functions such as failure information, test information, and line switching control of the remote stations under their control, so that centralized maintenance is possible and the maintenance can be greatly improved. .

[Brief description of drawings]

FIG. 1 is a block diagram of a maintenance exchange to which an embodiment of the present invention is applied, FIG. 2 is a detailed block diagram of a supervisory alarm controller shown in FIG. 1, and FIG. 3 is an explanation of supervisory test information multiplexing. FIGS. 4, 5 and 6 are explanatory views of the selector switching signal. 1 ... Exchange station in charge of maintenance, 2 ... Remote station, 3 ... General digital line highway, 3a ... Working side, 3b ... Standby side, 5 ... Time division switch, 6 ... Monitoring and alarm control device, 8 …… Alarm highway, 8a …… Active side, 8b …… Spare side, 9 …… Selector, 12 …… Alarm, 14 …… Timing control circuit, 15 …… Time slot unit switching circuit, 16 …… Switch.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyoshi Akiyama 3-9-11 Midoricho, Musashino City, Tokyo Inside Nippon Telegraph and Telephone Corporation, Communication Network Research Laboratories (72) Inventor Masami Miura 5 Shiba, Minato-ku, Tokyo No. 33-1 NEC Corporation (56) Reference JP-A-58-136164 (JP, A)

Claims (1)

[Claims] 1. A plurality of remote stations are respectively accommodated in a time-division network of a switching office in charge of maintenance via a duplicated general digital line, and each of the plurality of remote stations transmits a duplicated general digital line. The monitoring test information transmitted to the time division network in the maintenance exchange through the predetermined time slot of is transmitted through the time division network and on the dual alarm highway, which corresponds to the multiplexed remote station. A monitoring test information switching method that is always monitored through a monitoring test information transfer time slot, and a monitoring remote station compatible monitoring test information transfer time slot on the active alarm highway, If a failure at any one of the remote stations is detected while the monitoring test information from each of the plurality of remote stations is being monitored, the monitoring from that remote station will be performed thereafter. Exams Only, monitoring the test information switching scheme to be monitored via the remote station corresponding surveillance testing information transfer time slots on the spare system alarm highway.