JPH03108839A - Optical signal bypass designating system - Google Patents

Abstract

PURPOSE:To apply a bypass and to attain the segmentation of a fault even when the fault occurs in a large scale circuit requiring high speed operation by superposing an optical signal bypass designation from a central station to a terminal station on a power source line for an optical signal bypass, applying the bypass and the releasing of the optical signal. CONSTITUTION:When a central station designates the bypass to a terminal station, the central station sends a bypass command signal while superimposing the signal on the signal of an optical signal bypass power line 2a. The bypass designation/releasing control section 8A of the terminal station extracts and decode the superimposed bypass designating signal to select and control the bypass to a selector 7. The bypass is released similarly. Since the control of bypass is implemented not through a loop control section 6 composed of a high speed large scale circuit, the bypass designation from the center station through the bypass designation/releasing control section 8A is attained even when the fault of the loop control section 6 takes place. Thus, system-down is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical signal bypass instruction method, and particularly to an optical signal bypass instruction method for operating an optical signal bypass circuit of a terminal station in an optical loop system.

[Conventional technology]

FIG. 2 is a system configuration diagram for explaining the optical loop system. The central office 1 manages the entire system. Each of the plurality of terminal stations 10.11 to 1n accommodates a subscriber 2o and has so-called terminal functions such as signal conversion and relay in addition to exchange connections between these subscribers. The central station 1 and each of the terminal stations are connected in a loop by an optical signal path 2 to form an optical loop system. Note that the central office 1 can accommodate a plurality of subscribers and can be provided with the above-mentioned terminal office functions.

While the above optical loop system is in operation, a plurality of terminal stations 10, 1
1...1n, the optical signal path 2 is connected to the optical signal path 2 by a bypass 3 as shown by the dashed arrow in order to prevent the optical loop system from going down if a failure occurs at the terminal station 10, for example. However, it is necessary to prevent the above-mentioned failure from affecting the system operation between the central office 1 and the other terminal stations 1°, . . . , ln. Therefore, it is naturally necessary to perform a bypass at the faulty terminal station.

FIG. 3 is a block diagram showing an example of a conventional optical signal bypass instruction system.

In FIG. 3, 2 is an optical signal path, 2a is a power supply line for optical signal bypass, and 31 is a contact point of the station power supply monitoring relay 30, which switches in the direction shown by the broken line when the station power supply 9 has a failure. . 4 converts the optical signal into an electrical signal,
An optical/electrical converter (hereinafter referred to as 0/E
5 is an electrical/optical converter (hereinafter referred to as E/76) that converts an electrical signal into an optical signal, 6 receives the electrical signal from O/E4, and performs synchronization extraction, signal demultiplexing, and connection. A loop control section 7 performs control, etc., a selector 7 selects a normal path or a bypass path, and 8 extracts a bypass instruction/cancellation control signal from which the received signal is transmitted from the central station 1 by the loop control section 6. .

This is a bypass instruction/cancellation unit that controls the selector 7 to instruct/cancel bypass. When the optical loop system is operating normally, the input optical signal from the input optical signal path 2 is converted into an electrical signal by the O/E 4 and input to the loop control unit 6. If the input optical signal is to be relayed at this terminal station, the loop control section 6 inputs the electrical signal to the selector 7. During normal operation, bypass instruction/
The release unit 8 instructs the selector 7 to select the input from the loop control unit 6 which is the normal path, and the output of the selector 7 is input to E105 via the contact 31a, and E105 converts it into an optical signal. and sends it out to the output optical signal path 2b.

[Problem to be solved by the invention]

In the conventional optical signal bypass instruction method described above, when the central station 1 instructs the terminal station to bypass, the central station 1 multiplexes the bypass instruction command onto the optical signal and sends it to the optical signal path 2. At the station, the optical signal received via the optical signal path 2 is converted into an electrical signal by the O/E 4, and is input to the loop control section 6, where the loop control section establishes synchronization from the electrical signal.
Perform data separation. The bypass instruction/cancellation unit 8 extracts the bypass instruction command from the central office 1 multiplexed with the above data, interprets it, and instructs the selector 7 to select a bypass route. The same applies to instructions for canceling bypass.

However, in order to instruct/cancel the bypass, the loop control unit 6
However, the loop control unit 6 is a large-scale circuit that requires high-speed operation, and if a failure occurs in the loop control unit 6, bypass instructions from the central station 1 will be impossible.
There is a drawback that a failure in the loop control unit 6 becomes a serious failure that leads to system down.

[Means to solve the problem]

The optical signal bypass instruction method of the present invention is a means for supplying optical signal bypass power from the central station to the terminal stations in an optical loop system in which a central station and a plurality of terminal stations are connected in a loop through an optical signal path. is provided, and an instruction signal is superimposed on the optical signal bypass/power line by the central station to the terminal station to bypass or cancel the optical signal.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

In FIG. 1, 2 is an optical signal path, 2a is a power supply line for optical signal bypass, and 31 is a contact point of a station power supply monitoring relay 30, which switches in the direction shown by the broken line when the station power supply 9 has a failure. . 4 converts the optical signal into an electrical signal,
An optical/electrical converter (hereinafter referred to as 0/E
5 is an electrical/optical converter (hereinafter referred to as E10) that converts electrical signals into optical signals, 6 receives electrical signals from O/E4, and performs synchronization extraction, signal demultiplexing, connection control, etc. 7 is a selector that selects a normal path or a bypass path; 8A extracts a signal superimposed on the optical signal bypass feed line 2a, decodes it, and instructs the selector 7 to bypass. This is a bypass instruction/cancellation control section that performs control and cancellation and supplies bypass power to the contact 31.

Next, the operation will be explained. However, when the optical loop system is operating normally, the relay operation from the incoming optical signal path 2 to the outgoing optical signal path 2 is the same as in the prior art example described above, so a description thereof will be omitted.

When the central station instructs this terminal station to bypass, a bypass instruction signal is sent out superimposed on the optical signal bypass power supply line 2a. In the terminal station, the bypass instruction/cancellation control section 8A extracts and interprets the above-mentioned superimposed bypass instruction signal to select and control the bypass path for the selector 7, thereby performing bypass. The same applies to canceling the bypass.

In this embodiment, since the bypass instruction/cancellation control 8A does not go through the loop control section 6, which is composed of a high-speed, large-scale circuit, even if a failure occurs in the loop control section 6, the bypass instruction/cancellation control 8A is performed from the central station. This makes it possible to issue instructions and prevent system failure.

In this way, a bypass instruction signal and a cancellation signal are superimposed on the power line that supplies power for optical signal bypass from the central station to each terminal station, and the terminal station decodes the superimposed signal and issues a bypass instruction/cancellation signal. can be controlled.

〔Effect of the invention〕

As explained above, the present invention provides a means for supplying power for optical signal bypass from the central office to the terminal station, and superimposes an optical signal bypass instruction and release signal from the central office to the terminal station on the optical signal bypass power line. By bypassing and canceling the optical signal, even if a failure occurs in the loop control section of a large-scale circuit that requires high-speed operation, the bypass can be performed and the failure can be isolated.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a block diagram showing an example of a conventional optical signal bypass instruction method, and FIG. 3 is a system configuration diagram for explaining an optical loop system. DESCRIPTION OF SYMBOLS 1... Central office, 2... Optical signal path, 2a... Power supply line for optical signal bypass, 2b... Outgoing optical signal path, 3...
... Bypass route, 30 ... Power failure monitoring relay, 31
...Contact, 4...Optical/electrical converter, 5...Electrical/
Optical converter, 6... loop control section, 7... selector,
8, 8A... Bypass instruction/cancellation unit, 9... Power supply for terminal station, 10, 11.1n... Terminal station.

Claims (1)

[Claims] In an optical loop system in which a central office and a plurality of terminal stations are connected in a loop by an optical signal path, means for supplying optical signal bypass power from the central office to the terminal stations is provided, and the optical signal bypass power line An optical signal bypass instruction method, characterized in that the central station superimposes an instruction signal on the terminal station to bypass or cancel the optical signal.