JPS6030227A - Switching system of monitoring device - Google Patents

Abstract

PURPOSE:To switch monitoring devices excellently without using an signal line for monitoring by performing switching to a stand-by circuit in response to a break of an input signal to a repeater station and a switching command from a terminal station or terminal repeater station. CONSTITUTION:If the down circuit of a normal-use circuit #n to an intermediate repeater station REP3 is broken, a monitoring device SVA detects that to transmits and receive a monitor signal by using a stand-by circuit #S and also report that to a terminal repeater station or terminal station side where a switch LP is installed by using the circuit #S. At the same time, stations succeeding to the repeater station REP4 detect the input signal break of the circuit #n, and respective devices SVA operate similarly. At the terminal repeater station or terminal station side, on the other hand, the normal-use circuit #n is used to send the switching command to repeater stations REP1 and REP2 and switch the in-use circuit to #S.

Description

Detailed Description of the Invention (a) 0 Technical Field of the Invention The present invention relates to a method for switching a monitoring device of a relay station, and particularly to a method for switching a monitoring device of a relay station when switching a main signal line to a protection line due to communication line disconnection. This relates to the switching method.

(b) Problems with the Prior Art FIG. F is a diagram showing an embodiment of a conventional relay station monitoring device.

In the figure, T is a terminal relay station, REP is an intermediate relay station, SV is a monitoring device, a is a main signal line, and b is a monitoring signal line.

As shown in Fig. 1, in the conventional communication line, the main purpose is to communicate between the monitoring device SV that monitors each intermediate relay station REP and the monitoring device SV that monitors the terminal relay station T. signal line a
A different signal line was used.

However, with this conventional method, there is no problem when the relay span is relatively short, but when the relay span is several tens of kilometers like in the optical transmission method,
In the case where the signal line for monitoring exceeds 10,000 yen, a repeater must be used for the monitoring signal line.

For this reason, a method of using the main signal line as the signal line for the monitoring device SV can be considered, but in this case, when the main signal line is disconnected, how should the signal line for the monitoring device SV be connected? The question is whether to switch to a backup line.

(C)9 Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned drawbacks of the prior art;
It is an object of the present invention to provide a good switching method for a monitoring device that does not require consideration of line loss of a monitoring signal line.

(d) 9 Structure of the Invention According to the present invention, the above-mentioned object is composed of a plurality of relay stations connected to a regular line and a protection line, and both terminal stations or both terminal station relay stations, and a monitoring device for the relay stations. In a transmission system in which a main signal line is used as an information signal transmission path from the terminal station or the monitoring device of both terminal stations or the relay station of both terminal stations, when the main signal line is disconnected, the transmission path for the monitoring device of each relay station is disconnected. To provide a switching method for a monitoring device, characterized in that when switching from a regular line to a protection line, switching is performed by disconnecting the input signal of the relay station and a logical sum of a switching command from the terminal station or the terminal relay station. This is achieved by

(64. Embodiment of the Invention FIG. 2 is a block diagram showing an embodiment of an intermediate relay station of the present invention, and the intermediate relay station is composed of a monitoring device SVA according to the present invention and a plurality of repeaters rep. .

In the figure, SVA is a monitoring device according to the present invention, rep is a repeater, and each repeater rep has two extraction circuits (one for uplink and one for downlink), an insertion circuit I, and a middle amplifier amp.
It consists of Note that rep #n represents a repeater for regular line #n.

FIG. 3 is a diagram illustrating an embodiment of the monitoring device repositioning method according to the present invention.

In the figure, LP is a line switch, REP 1, REP 2, etc.
REPn represents an intermediate relay station according to the present invention, SVA represents a monitoring device according to the present invention, #1 to #n represent regular lines, and #S represents a protection line.

Note that the line switching device LP is installed at the terminal relay station T or the terminal station.

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

In the present invention, a system is adopted in which a monitoring signal is sent using the main signal line without using a monitoring signal line separate from the main signal line.

That is, in the present invention, a spare bit for the monitoring device is added to the main signal, and the spare bit is used to transmit a signal to the monitoring device via the main signal line.

As shown in FIG. 2, signals using these spare bits are synchronized at the intermediate relay station, inserted from the insertion circuit (2), extracted by the extraction circuit, and transmitted/received.

As shown in Figure 3, the regular line #n is the intermediate relay station REP.
Assume that the downlink between REP 2 and intermediate relay station REP 3 is broken at a point marked with an X.

Naturally, when the line is disconnected, the communication line is switched from the regular line #n to the protection line #S. Also, the monitoring signal is the special express and regular line #
Since the transmission/reception was using n, it is necessary to switch to using the protection line #S for transmission/reception.

The method for implementing this is described below.

Since the input signal of the repeater using the regular line #n in the intermediate relay station REPa is disconnected due to the above failure, the monitoring device SVA in the intermediate relay station REP3 detects the disconnection of the input signal of the regular line #n. , the protection line #S is used to send and receive monitoring signals, and the switching device LP uses the protection line #S to notify that the input signal of the own station has been disconnected and that the switch has been switched to the protection line #S. Notify the terminal relay station T or the terminal station side where the terminal is installed.

At the same time, intermediate relay station RFP4 and lower stations similarly detect input signal disconnection of regular line #n, use protection line #S to send and receive monitoring signals, and at the same time, terminal relay station T or terminal Report to the station.

The terminal relay station T or the terminal side monitoring device SVA receives the notification of tb and sends a switching command to the intermediate relay stations REPI and 2 using the regular line #n.

Upon receiving this command, the intermediate relay stations REP 1 and 2 switch the line in use from the regular line #n to the protection line #S.

Also, the terminal relay station T or the monitoring device SVA on the terminal side is the switching device L.
P is operated to switch the line in use from the regular line #n to the protection line #S.

By the above procedure, operation using the protection line #S begins.

Furthermore, the terminal relay station T or the terminal station side may also identify that a line disconnection has occurred due to the disconnection of its own received signal, and may send a switching signal to the intermediate relay station.

As explained above, the communication system can be operated without any trouble by performing a switching operation based on (1) an input cutoff at the own station, and (2) the logical sum of the switching signals from the terminal relay station T or the terminal station monitoring device SVA. It can be operated.

(f) 0 Effects of the Invention As explained in detail above, according to the present invention, there is a great effect that good switching of the monitoring device can be carried out without any hindrance, without having to consider the line loss of the monitoring signal line. be.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a conventional relay station monitoring device. FIG. 2 is a block diagram showing an embodiment of an intermediate relay station of the present invention. FIG. 3 is a diagram illustrating an embodiment of a monitoring device switching method according to the present invention. In the figure, T is a terminal relay station, REP is an intermediate relay station, SV is a monitoring device, a is a main signal line, b is a monitoring signal line, LP is a line switch, REP 1, RE P 2...REPn are SVA is a monitoring device according to the present invention, #1 to #n are lines for seats, #S is a protection line, and rep is an intermediate relay station according to the present invention.
is a repeater, D is an extraction circuit, r is an insertion circuit, and rep#n is a repeater for the current line #n.

Claims (1)

[Claims] Consisting of a plurality of relay stations connected to a regular line, a protection line, and both end stations or a both end station relay station, information signal transmission from a monitoring device of the relay station to a monitoring device of the both end stations or both end station relay stations. In a transmission system that uses a main signal line as a line, when the cold line is disconnected and the transmission line for the monitoring device of each relay station is switched from the disconnected regular line to the protection line, the input signal of the relay station is disconnected. and a switching command from the terminal station or the terminal relay station.