JP2826383B2 - Alarm transfer method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm transfer system, and more particularly to an alarm transfer system used for a relay station of a time division multiplex communication system in which a plurality of relay stations are connected.

[0002]

2. Description of the Related Art In a time division multiplex communication system, when a failure occurs in an unmanned relay station, alarm information on the failure is sent to a monitoring station such as a manned terminal station for centralized monitoring in order to know the failure. doing.

The system has an alarm transfer bit attached to the main signal in the frame structure of the time division multiplexed signal on the transmission line as a channel for transferring the alarm signal. Usually, this alarm transfer bit has a configuration of several bits. However, since it is uneconomical to provide this bit for each relay station, each relay station uses a common bit. For this reason, the transfer method of the alarm signal in each relay station is as follows.

FIG. 4 is a block diagram showing a configuration of a conventional alarm transfer system. Received signal 101 from transmission line upstream station
B enters the branch unit 1. The branch unit 1 branches and drops the alarm transfer bit included in the received signal, and outputs an upstream station warning signal 105B generated when a failure occurs in the upstream relay station. The upstream station alarm signal 105B and the own station alarm signal 104B generated when a fault occurs in the own station enter the switch 4, and when there is no own station alarm signal 104B, the upstream station alarm signal 105B is output. When there is an alarm signal 104B, switching is performed so as to output the own station alarm signal 104B. This output signal 107B enters the inserter 5, is reinserted into the alarm transfer bit of the transmission signal 108B in the downstream direction of the transmission path, and is transmitted downstream.

After all, when there is no fault in the own station, the upstream station alarm signal 105B is transferred as it is in the downstream direction. When there is a fault in the own station, the own station alarm signal 104B is substituted for the upstream station alarm signal 105B. Is sent.

The alarm signal is composed of failure item information and the own station ID number.

[0007]

As described with reference to FIG. 4, in the conventional alarm transfer system, when a fault occurs in the upstream station and a fault occurs in the own station while transferring the alarm signal, the alarm of the upstream station is issued. Since the signal is switched to the own station alarm signal, the upstream station alarm signal is not transmitted. That is, when a plurality of relay stations fail simultaneously in the system, only the alarm signal of the relay station close to the monitoring station is transmitted to the monitoring station, and the alarm signal of the previous relay station is not transmitted.

An object of the present invention is to solve the above problem and to provide an alarm transfer system capable of monitoring a plurality of stations even when a fault occurs in the plurality of stations without particularly increasing the number of alarm transfer bits.

[0009]

An alarm transfer system according to the present invention includes a branching device that receives a time division multiplex signal from an upstream direction of a transmission line and branches an upstream station alarm signal inserted into the time division multiplex signal. the upstream station alarm signal, time-division multiplexes and own alarm signal generated at the time of failure of the self station receives a multiplexing circuit for outputting a multiplex alarm signal, the multi-alarm signal, the
The upstream station alarm signal forming the multiplex alarm signal;
Each of the station alarm signals is converted to each of the time division multiplex signals.
Re-inserted sequentially into the alarm transfer bits of the frame and downstream of the transmission path
And an inserter for transmitting in the direction .

[0010] Alternatively, in addition to the above means, the upstream station alarm signal and the multiplex alarm signal are input, and if there is no own station alarm signal, the upstream station alarm signal is output, and the own station alarm signal is present. when includes a switch for outputting the multiplexed alarm signal, and inputs the output signal of the switch prior Symbol inserter.

Alternatively, a splitter for receiving a time-division multiplex signal from an upstream direction of a transmission line and branching an upstream station alarm signal inserted into the time-division multiplex signal, and an upstream fault included in the upstream station alarm signal A detector for detecting a station number signal; a counter for adding a count of 1 to a station number of the upstream failure station number signal by a local station alarm signal generated when a local station fails; an output of the local station alarm signal and the counter; A multiplexing circuit for multiplexing signals and outputting a multiplexed alarm signal; inputting the upstream station alarm signal and the multiplexed alarm signal; outputting the upstream station alarm signal when there is no own station alarm signal; A switch for outputting the multiplex alarm signal when there is an alarm signal; and an inserter for re-inserting the output signal of the switch into the time-division multiplex signal transmitted downstream of the transmission path.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the first embodiment according to the present invention.

A received signal 101 from the upstream side of the transmission line enters the branching device 1 and outputs an upstream station alarm signal 105. This upstream station alarm signal 105 is input to both the multiplexing circuit 3 and the switch 4. On the other hand, the local station alarm signal 104 when a failure occurs in the local station is input to both the multiplexing circuit 3 and the switch 4. In the multiplexing circuit 3, the upstream station alarm signal 105 and the own station alarm signal 104 are rearranged on the time axis and multiplexed in frame units of the transmission line signal. The multiplex alarm signal 106 is input to the switch 4. The switch 4 outputs the multiplex alarm signal 1
06 and the previous upstream station warning signal 105
When the local station alarm signal 104 is not present, the upstream station alarm signal 105 is output. When the own station alarm signal 104 is present, the multiplex alarm signal 106 is output. The switcher output signal 107 is input to the inserter 5, and is reinserted into the alarm transfer bit of the transmission signal 108 in the downstream direction of the transmission line and transmitted.

That is, when there is no failure in the own station, the upstream station alarm signal 105 is transferred downstream as it is through the branching unit 1, the switching unit 4, and the inserting unit 5 as in the conventional example. , A multiplex alarm signal 106 is transmitted in place of the upstream station alarm signal.

FIGS. 2A to 2D are time charts for explaining the operation of the multiplexing circuit 3. FIG. FIG. 5A shows the frame configuration of the received signal 101, and shows a state in which the upstream station alarm signal "A" is carried on the alarm transfer bit attached to the main signal. FIG. 3B shows the output of the branching unit 1, that is, the upstream station alarm signal "A". FIG. 9C shows the multiplex circuit output, that is, the multiplex alarm signal 106, but the upstream station alarm signal "A".
And the local station alarm signal “B” are alternately arranged and multiplexed on a frame basis. FIG. 3D shows a state in which there are two faulty stations in the upstream station, the upstream station alarm signals include "A1" and "A2", and the own station alarm signal "B" is multiplexed.

After all, the alarm signal of each faulty station is multiplexed and sent to the transmission line, so that the monitoring station can demodulate it and obtain information of each faulty station at the same time.

In the above description, the case where the switching unit 4 is provided has been described.
This device can function sufficiently even when is directly input to the inserter 5. However, in this case, even when no alarm signal is generated, the alarm signal transfer bits of each relay station are always multiplexed. There is a disadvantage that timing is delayed.

FIG. 3 is a block diagram showing the configuration of a second embodiment of the present invention. The difference from the first embodiment lies in the portion of the multiplexing circuit section 3A, and the following description will focus on this portion. In the second embodiment, the condition is that the alarm transfer bit has information indicating the number of failed stations.

The upstream station alarm signal 105A branched and output from the branch unit 1 is input to both the multiplex circuit unit 3A and the switch unit 4. On the other hand, the own station alarm signal 104A is also input to both the multiplexing circuit unit 3A and the switch 4. In the multiplexing circuit section 3A, the upstream station alarm signal 105A first enters the detector 301, and the number of failed stations contained in this signal is detected. Next, the counter 302 is entered.
The count 1 is added to the number of failed stations by 4A. Next, the signal enters the multiplexing circuit 303, where the faulty station number signal is multiplexed with the local station alarm signal 104A and output as a multiplex alarm signal 106A. The multiplex alarm signal 106A enters the switch 4, and the subsequent operation is the same as in the first embodiment.

After all, since the multiplex alarm signal 106A contains information on the number of faulty stations, the monitoring station receives this information and receives fault information on the station closest to the monitor station and fault information on the upstream station before that station. You can know the number of stations. Knowing the number of faulty stations at the upstream station is important information when performing fault recovery work.

[0021]

According to the alarm transfer method of the present invention, when a fault occurs in each relay station, an alarm signal is multiplexed in frame units and transferred at each relay station, or information on the number of faulty stations is included in the alarm signal. The monitoring station can obtain information on each faulty station at the same time with respect to simultaneous faults of multiple stations without increasing the number of alarm transfer bits so much, depending on the means of including and transferring the bits. It is convenient and has a great effect that the failure can be quickly restored.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a time chart illustrating a method for multiplexing an alarm signal according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a second exemplary embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Branch device 3 Multiplexer 4 Switcher 5 Inserter 3A Multiplexer part 6, 6A, 6B Alarm transfer device 301 Detector 302 Counter 303 Multiplexer

Claims (3)

(57) [Claims] 1. A branching device for receiving a time division multiplex signal from an upstream direction of a transmission line and branching an upstream station alarm signal inserted into the time division multiplex signal; time-division multiplexed and own alarm signal during generated, a multiplexing circuit for outputting a multiplex alarm signal, the multi-alarm signal input
The upstream station alarm signal comprising the multiplex alarm signal
And each of the local station alarm signals,
It is re-inserted into the alarm transfer bit of each frame
An alarm transfer system comprising: an inserter for transmitting data in a downstream direction of a transmission path . 2. A type and said upstream station alarm signal and the multiplexed alarm signal, when no own alarm signal outputs the upstream station alarm signal, when the there is a local station alarm signal said multiple alarm A switch for outputting a signal, and outputting an output signal of the switch.
Alarm transfer method according to claim 1, characterized in that added prior Symbol inserter. 3. A branching device for receiving a time division multiplex signal from an upstream direction of a transmission path and branching an upstream station alarm signal inserted into the time division multiplex signal, and an upstream fault included in the upstream station alarm signal. A detector for detecting a station number signal; a counter for adding a count of 1 to a station number of the upstream failure station number signal by a local station alarm signal generated when a local station fails; an output of the local station alarm signal and the counter; A multiplexing circuit for multiplexing signals and outputting a multiplexed alarm signal; inputting the upstream station alarm signal and the multiplexed alarm signal; outputting the upstream station alarm signal when there is no own station alarm signal; A switch for outputting the multiplex alarm signal when there is an alarm signal, and an inserter for re-inserting the output signal of the switch into the time division multiplex signal transmitted in the downstream direction of the transmission path. Alarm transfer method.