JPH03259626A - Line changeover device - Google Patents

Abstract

PURPOSE:To eliminate the need for a manual switch so as to reduce the time required for the maintenance, to simplify the channel setting and to improve the setting reliability by setting an inoperation channel when an active line is selected into a standby line and transferring the information of the inoperation channel to a required section. CONSTITUTION:A line changeover device consists of a switch section 410 selecting plural active and standby lines and a control section 400 giving a set/reset command and a changeover command to a switch section 410. The control section 400 is provided with a CPU 401, a parallel input/output device (PI/O) 402, a serial input/output device (SI/O) 403 and an EPROM 404. The switch section 410 is provided with a changeover line 411 switching the channel to active/standby lines, a drive circuit 412 driving the changeover line 411 and a channel setting circuit 413 setting a channel to the drive circuit 412. The line changeover device transfers setting channel information to an opposite station through a service data channel 30 of an optical terminal station multiplexer 3 via the SI/O 403.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a line switching device used in an optical transmission system, and in particular enables setting of an unused channel when switching from a working line to a protection line. The present invention relates to a line switching device that can transfer information on unused channels to necessary departments.

[Conventional technology]

This type of line switching device is used in an optical transmission system that multiplexes three lines and n channels m [bits/sec].

Here, m and n are positive integers.

FIG. 5 is a configuration diagram showing an optical transmission system using a line switching device.

The optical transmission system 1 shown in FIG. 5 multiplexes four channels capable of transmitting data at a rate of 14 MM bits/sec to enable transmission using a plurality of lines.
It is structured as follows.

In other words, the working first line 2 for optical transmission transmission and reception is as follows:
It is connected between the optical terminal multiplexing devices 3□ and 321. Similarly, the working second line 2□ for optical transmission transmission and reception is connected to the optical terminal multiplexing device 3.2. Connected between 3□2. The optical transmission/reception protection line 2° is an optical terminal multiplexing device 3. , 32°. Optical terminal multiplexer 310+32°.

311 + 321 can multiplex 4 channels, and each channel number (in the figure, CHI, CH2
, CH3, CH4). The optical terminal multiplexer 31ffi+ 322 is capable of multiplexing three channels, and has switches for each channel number (in the figure, CHI, CH2, CH4). Accordingly, the switching circuit 41
is configured.

By the way, line switching device 4. , 42 have the same configuration, so the configuration will be explained without subscripts.

The line switching device 4 includes a switching circuit 41, a drive circuit (not shown) that drives the switching circuit 41, and a control section 40 that drives and controls the drive circuit.

In such a line switching device 4, the working first line 2.
When switching to the protection line 2o when all the channels (CHI to CH4) are in use as in the example shown in FIG.

However, if the third channel (CH3) is not used like the second working line 22, the first channel. Although the second and fourth channels (CHI, CH2, CH4) can be switched, the third channel must be connected to the working second line 22.

However, since the conventional line switching device 4 described above uses a batch switching method for the switching circuit 41 based on a switching command from the control unit 40, switching cannot be performed, and each channel (CHI, CH2, CH3 , CH4) was set to ``used'' or ``unused'' using a manual switch.

[Problem to be solved by the invention]

In the conventional line switching device described above, when there is an unused channel, the channel setting is performed using a manual switch, so the setting must be done manually between the local station and the other station. There is a problem that maintenance is time consuming.

Furthermore, in the above-mentioned conventional line switching device, manual switches are provided on the transmitting side and the receiving side, so as the number of systems increases, the number of switches increases, making it easy to make incorrect settings.
Moreover, there is a problem that maintenance becomes complicated.

Further, the conventional line switching device described above has a problem in that maintenance is hindered because information about used channels or unused channels cannot be transmitted to other line switching devices.

The present invention solves the above-mentioned conventional problems, and makes it possible to set an unused channel when switching from a working line to a protection line, and to transfer information on unused channels to the necessary department. The purpose is to provide equipment.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention is used in an optical transmission system that has a plurality of working lines and a protection line, and is capable of multiplexing and transmitting a plurality of channels, and is capable of switching between the working line and the protection line. In a line switching device that is capable of The present invention is characterized in that it includes a control section that gives a set/reset command to the circuit and a switching signal to the drive circuit.

The present invention can set up unused channels.

〔Example〕

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

1 to 4 are shown for detailed explanation of the present invention.

Here, FIG. 1 is a block diagram showing the overall configuration of a line switching device according to an embodiment of the present invention. Figure 2 is a circuit diagram showing a switching circuit used in the same embodiment, Figures 3 (A) and (B) are circuit diagrams showing a drive circuit used in the same embodiment and driving the switching circuit, and Figure 4. (A) and (B) are circuit diagrams showing a channel setting circuit that is used in the same embodiment and drives a drive circuit to set a channel.

The line switching device shown in FIG. 1 includes a switch unit 410 that switches between multiple working lines and protection lines;
and a control section 400 that provides set/reset commands and switching signals. The control unit 400 includes a CPU 401
, Nokuralel input/output device (Pl10) 402,
Serial output device (SI/○) 403 and EPROM
404. The switch section 410 includes a switching circuit 411, a drive circuit 412, and a channel setting circuit 4.
It is equipped with 13. This line switching device is 5I104
03, the set channel information can be transferred to the other station via the service data channel 30 of the optical terminal multiplexer 3.

As shown in FIGS. 2(A) and 2(B), the switching circuit 411 is laterally restricted by relay contacts rfl-1 to r114, and these relay contacts rfl-1 to riJ-4 are connected to the third
By being driven by the drive circuit 412 shown in FIGS. (A) and (B), switching operation between the working line and the protection line is performed. Furthermore, I! l (A) shows the transmitting side, Figure (B) shows the receiving side, and the same applies hereafter.

The drive circuit 412 includes a relay R as shown in FIG.
LI-1 to RLI-4 and relay contacts r111' to rI
11-4 and is laterally throttled, and relay RLl-1
-RLI-4 is the relay contact rji! 1-1 ~r11-
The channel is set by 4', and relay RLl-1 is set by the switching signal (set, reset signal).
-The one set among RLl-4 operates.

The channel setting circuit 413 is connected to the PI 104 of the control unit 400.
It is composed of latch relays RLI-1' to RLI-4' whose excitation states are controlled by set/reset signals from 02.

The operation of such an embodiment will be explained.

Current 2nd line 22 (3rd channel (CH3) is not used)
When switching to the protection line 2°, at station A, CPU4
01 via PI10402. Second. Latch relay RLI of 4th channel (CHl, CH2, CH4)
-1' to RLI-4', and set the 3rd channel (CH
3) Reset the latch relay RLI-3. next,
CPU401 is 5I10403/currently used second line 22
- The first . Second. 4th channel (CHI.

CH2, CH4) latch relay RL2-1' ~RL
2-4' and transfers information for resetting the latch relay RL2-3' of the third channel (CH3) to the B station.

By doing this, both stations A and B will have relay contact r in Figure 3.
11-1 ~ r 11-4', r 12-1'
~rA2-4, r 113' r 12
- Oven only 3' and close the others.

When a set is input to the circuit shown in Fig. 3 with the channels set in this way, only relays RLI-3 and RL2-3 are de-energized, and relays RL11 to RL1-4R are in a de-energized state.
L2-1 to RL2-4 become excited.

As a result, except for the third channel, the first, second, and fourth channels are switched to the protection line 2° side.

Note that the above-mentioned setting information is stored in the EPROM 404.

〔Effect of the invention〕

As described above, the present invention allows unused channels to be determined individually, thereby eliminating the need for manual switches, reducing the time required for maintenance, simplifying channel settings, and improving the reliability of settings. Further, according to the present invention, information on unused channels can be transferred to other departments, so channels can be automatically set and maintenance becomes easier.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing a switching circuit of the same embodiment, and FIG.
B) is a circuit diagram showing the drive circuit of the same embodiment, and FIG.
A) and (B) are circuit diagrams showing the channel setting circuit of the same embodiment, and FIG. 5 is a block diagram showing the optical transmission system. 4...--Line switching device, 400... Control unit, 410... Switch unit, 411...
-Switching circuit, 412... Drive circuit, Eight Genus 3... Channel setting circuit.

Claims (1)

[Scope of Claims] A line switching device that is used in an optical transmission system that has a plurality of working lines and a protection line and is capable of multiplexing and transmitting a plurality of channels, and is capable of switching between the working line and the protection line, comprising: Switching circuit that switches between working line and protection line,
A switch unit including a drive circuit that switches and drives this switching circuit, a channel setting circuit that can set a channel to the drive circuit, and a switch unit that provides a set/reset command to the channel setting circuit of the switch unit and a switching signal to the drive circuit. A line switching device characterized by comprising a control section.