JPS63285041A - Master/slave switching system - Google Patents

Abstract

PURPOSE:To collect alarm information in the case of access by using CPU control so as to switch alarm monitor such as a repeater and storing content of monitor. CONSTITUTION:When a monitoring line (l) is normal, the result of polling for both stations A, B is the same by the polling from the stations A, B. When the monitoring line (l) is disconnected at, e.g., a point P, only repeaters R1, R2 collect the data by the polling from the station A and only a repeater R3 collects the data in the polling from the station B and the result of polling for both the stations differ. The result of polling of both the stations A, B is collected through a slave supervisory equipment SSV of a host device and even if a fault takes place at the point P, the state of all repeaters can be recognized. Moreover, the faulty point is located from the result of polling and the fault is restored immediately.

Description

[Detailed Description of the Invention] [Summary] Middle Il! A device that switches the alarm monitor of a device, etc. under CPU control, stores the monitor contents, and retrieves the alarm information when accessed.

[Industrial application field]

The present invention relates to a master/slave terminal device switching system that monitors a transmission path in which a repeater is inserted.

[Conventional technology]

An example of a monitoring method using optical signals for a transmission line in which a repeater is inserted is shown in FIG. 3. In this figure, L RE (1
ine repeater equipment) is the repeater, LTE (one terminal
equipment) is a terminal device that monitors errors in the repeater. The terminal device LTE has a master M and a slave S, and the master terminal device M-LTE performs error monitoring of itself and the repeater LRH, and the slave terminal device 5
- LTE performs self-only error monitoring. This FIG. 3 shows a monitoring system for a primary group PCM transmission line, in which a repeater LRE is inserted into the transmission line (not shown), a terminal device LTE is installed in a slave station, and error information is transmitted to a monitoring system of a master station. Transmit to.

The master terminal device M-LTE monitors errors in the repeater LRE through the monitoring line 11, but the monitoring line 1+ is connected to the point P, for example.
If the connection is disconnected, subsequent error monitoring of the repeater will no longer be possible. For this problem, add another monitoring line (J2)
When the monitoring line 11 fails, use β2 to connect M-L.
TE monitors LRE or 5-LTE to M-LTE
Run it like this and use a2 from 5-LTE to LRE
However, this method requires two systems of monitoring circuits and cannot be said to be a highly cost-effective system.

[Problem that the invention seeks to solve]

If there is only one line of monitoring line, no monitoring information can be obtained in the event of a failure, but if there are two lines of monitoring line, monitoring information can be obtained even if one line has a failure, but an increase in equipment costs is unavoidable. Therefore, the present invention aims to reduce the hardware scale by designing software with redundancy, and to provide a highly reliable monitoring line at low cost.

[Means for solving problems]

As shown in FIG. 1, in the present invention, repeater R (LR in FIG.
(corresponding to E) is monitored from both master M and slave S. These M and S are the M-LTE, 5-LT
E, and is placed at each station (station A and station B in the figure) of the -th group PCM transmission path. Station A polls each of the medium IlI units R and station B, and collects the status of each. In addition, the B station polls each of the repeaters R and the A station, and collects the status of each. The LTE software of each station is designed to perform this alternately. Therefore, one cycle consists of the A station sequentially polling repeaters R1, R2, R3 and the B station, and then the B station sequentially polling the repeaters R3, R2, R1 and the A station. Repeated.

In this way, each polling result is collected and stored in stations A and B.

[Effect]

In the polling from stations A and B, if the monitoring line β is normal, the polling results held by both stations A and B are the same. For example, if the monitoring line l is disconnected at point P, polling from station A can collect data only for repeaters R1 and R2, polling from station B can collect data only for repeater R3, and both Stations will have different polling results.

The polling results held by both stations A and B are sent to the upper monitoring device S.
SV (slave 5supervisary)
With these, even if a failure occurs at point P, the status of all repeaters can be known.

In addition, the failure point can be identified from these polling results.
Disaster recovery work can begin immediately.

〔Example〕

FIG. 2 shows an embodiment of the present invention. The repeater LRE (more specifically, its jack and alarm J/A) is the monitoring line β
It has a cascade configuration in which it takes in the data once and sends it to the next stage if it is not addressed to itself. In this system, since the output signal level is OdB, each repeater performs amplification, and there is no need to take special consideration to signal attenuation. Although not shown, the main components of the J/A section are a processor CPU and FSX interfaces (modems) on the M and S sides. In other words, this monitoring line is based on the FSK method.The polling is carried out from the master terminal device M-LTE to the LREI,
2.3 and 5-LTE, and then slave terminal device 5-LTE performs LRE3.2゜1 and M-LTE.
For example, if a line failure occurs at point P in this state, 5-LTE will perform M-,
It will no longer be polled from LTE. At this time, the slave terminal device 5-LTE interrupts the master monitoring device MSV via the slave monitoring device 5SV2 and requests collection of polling results. Therefore, MSV is 5SVI, 5
The polling results of the master terminal device M-LTE and the slave terminal device 5-LTE are obtained via the SV2, and based on these, the status of each LRE is known and the location of the fault is specified.

The repeater LRE has amplifiers for 36 lines, and the status of the repeater includes the presence or absence of a signal on each of these lines, the bit error rate, etc.

The monitoring device SSV is always connected to other equipment of the station (terminal device).
f (switching equipment, multiplexing equipment, etc.)
When the above-mentioned interrupt from 5-LTE is received, the polling results are retrieved. Therefore, even if the present invention is implemented, the hardware will not be changed or expanded so much, and only software will be added.

In a state where there is no line failure, the polling results of both the master and slave terminal devices are the same, so the polling results of the master terminal device are representative and sent to the monitoring device of the master station.

〔Effect of the invention〕

As explained above, according to the present invention, only one monitoring line is required in terms of hardware, and by polling monitoring from both ends, each repeater can be monitored even if the line is disconnected. Redundancy can be achieved without increasing costs.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the method of the present invention, FIG. 2 is a detailed explanatory diagram of the present invention, and FIG. 3 is an explanatory diagram of the conventional method. In FIG. 1, R is a repeater, l is a monitoring line, M is a master, S is a slave, and SSv is a slave monitoring device.

Claims (1)

[Claims] A master terminal device is installed at a station (A) at one end of a transmission path in which a plurality of repeaters (R, R, . . .
Place a slave terminal device in B), and the master terminal device sequentially captures the status of each repeater by polling, calls the slave terminal device by polling, and then sequentially captures the status of each repeater from the slave terminal device by polling. , These are repeated, and when the slave terminal device is not called by the master terminal device, the slave terminal device interrupts the monitoring device (SSV) and causes the polling results of both the master and slave terminal devices to be fetched. .