JPH0481146A - Optical communication controller - Google Patents

Abstract

PURPOSE:To attain a test diagnosis of a slave optical transmission line at an optional point of time without disturbing communication by a main transmission line by selecting optionally and simultaneously the connection between 1st, 2nd optical transmission reception sections and 1st, 2nd communication control sections or the connection between a transmission reception section and a reception section in the 1st, 2nd optical transmission reception sections. CONSTITUTION:An optical signal received by an optical reception section 6 is selected by selectors 11,13 and fed to communication control sections 14, 15. Moreover, a transmission signal from the communication control sections 14, 15 is selected by selectors 10, 12 and sent to optical cables B5, A6 as an optical signal via transmission sections 8, 7. The selectors 10, 11, 12, 13 are selected and commanded by a control section 16, the combination of the selection is freely implemented, and the optical signal received by, e.g., the optical reception section 6 is sent to the optical cable B5 from the optical transmission section 8 via the selectors 11, 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical communication control device in a communication system connected in a ring by an optical transmission line.

[Conventional technology]

Traditionally, this type of communication system has been the ANS■ (American National Standards Association)'s FDD I (F1ber Dis).
tribut, ed Data Interface
) Loop type LA with token passing method represented by
N system etc. are known. This kind of loop type LA
In the N system, the optical transmission line that connects the optical communication control devices that make up the system consists of a first optical transmission line and a second optical transmission line, and the optical communication control device is shown in Figure 3. As shown, a first optical transmitter/receiver for the first optical transmission line, a second optical transmitter/receiver for the second optical transmission line, and one communication control unit that performs input/output processing of signals with the optical transmitter/receiver. , a selector that is located between the optical transmitter/receiver and one communication controller and switches connections between the communication controller, the first optical transmitter/receiver, and the second optical transmitter/receiver using a switching signal; and a selector for transmitting/receiving data with the communication controller. It consisted of a control section that sends a switching signal to the selector.

Test diagnosis of the second optical transmission line is performed by periodically switching between the first optical transmission line and the second optical transmission line using a selector controlled by the control unit, connecting the first optical transmission line to the communication control unit, and then connecting the second optical transmission line to the communication control unit. Provide optical transmission lines for service and detect defects at an early stage.
The method used was to temporarily stop the communication service using the first optical transmission line and test the second optical transmission line using the communication control unit.

[Problems to be Solved by the Invention] The above-mentioned second optical transmission line testing method is a method of detecting defects by stopping the communication service or providing normal service, so there is no negative impact on the communication service. It was inevitable.

Furthermore, such testing methods target transmission lines that pass through all the optical communication control devices that make up the communication system, so even if a defect is discovered, it is difficult to obtain enough information to identify the defective location. There was also the drawback that there was no.

[Means to solve the problem]

The present invention provides a communication system constituted by a plurality of optical communication control devices and an optical transmission path connecting the plurality of optical communication control devices in a ring shape, wherein the optical transmission path includes a first transmitting/receiving optical cable and a first transmitting/receiving optical cable. Consists of two transmitting and receiving optical cables,
a first optical transmitter/receiver for the first transmitter/receiver optical cable; a second optical transmitter/receiver for the second transmitter/receiver optical cable; a communication control unit that performs signal input/output processing with the optical transmitter/receiver; and the optical transmitter/receiver. a selector located between the communication control section and switching the connection between the communication control section, the first optical transmitting/receiving section, and the second optical transmitting/receiving section according to a switching signal; An optical communication control device comprising a control unit that sends the switching signal to a selector, the optical communication control device including a first communication control unit and a second communication control unit, wherein the selector receives the switching signal from the control unit. connection between the first optical transmitter/receiver and the second optical transmitter/receiver and the first communication controller and the second communication controller, or the first optical transmitter/receiver and the second optical transmitter/receiver according to a switching signal; It is characterized by comprising means for arbitrarily and simultaneously switching connections between the transmitting section and the receiving section in the second optical transmitting/receiving section.

〔Example〕

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

FIG. 1 is a block diagram of a communication system showing an embodiment of the present invention. In FIG. 1, the communication system includes optical communication control devices 1, 2, 3, 4.5 and a number of optical communication control devices (not shown), and a first optical transmission system that connects the optical communication control devices in a ring shape. Optical cables Al and A2 that make up the
．． A3. A4 and optical cable B that constitutes the second optical transmission line
l, B2. B3. It is composed of B4.

FIG. 2 is a block diagram of the optical communication control unit of the optical communication control device, and includes a control unit 16 that controls the entire optical communication control device, a first communication control unit 14 connected to the control unit 16, and a second communication control unit 14 connected to the control unit 16. , an optical receiver 6 that receives an optical signal from the optical cable A5, an optical transmitter 7 that transmits the optical signal to the optical cable A6, and an optical receiver 9 that similarly receives the optical signal and transmits the optical signal. The optical signal received by the optical receiver 6 is selected by the selector 11.13 and sent to the communication controller 14.
and is supplied to the communication control section 15.

Further, the transmission signals from the communication control section 14 and the communication control section 15 are selected by the selector 10.12 and sent out as optical signals to the optical cable B5 and the optical cable 86 by the optical transmission section 8.7.

These selectors 10, 11, 12.13 are controlled by the control section 16.
The combination of selections is free, for example, the optical signal received by the optical receiver 6 is sent to the selector 11.
．． It is also possible to send the signal from the optical transmitter 8 to the optical cable B5 via the optical cable B5.

The control unit 16 has an interface terminal 17, and is configured to be able to connect a general operation console to the interface terminal 17 to issue instructions for testing the optical transmission line and display the results.

In normal communication, the optical cable Al that constitutes the first optical transmission line
, A2. A3. This is executed between each optical communication control device via A4, and between each optical communication control device, the optical signal received by the optical receiver 6 is taken into the communication control section 14 via the selector 11, and the signal addressed to the own device is rejected. The received data is determined, and if it is addressed to the own device, it is passed to the control unit 16 as received data. If it is not addressed to the own device, it is sent directly to the optical cable A6 via the selector 12 and the optical transmitter 7, and relayed to the next optical communication control device, and mutual communication is executed between each optical communication control device in the communication system. .

While the communication system is communicating in this way, the optical cables Bl, B2 . B
3. Although B4 is not used, if the first optical transmission line becomes a failure, communication can be continued using the second optical transmission line by switching the selectors 10, 11, 12, and 13.

Further, while communication is being performed using the first optical transmission path, the communication control unit 15 of the optical communication control device connects the optical receiving unit 9 and the selector 10.1B to the second optical transmission path. The optical transmitter 8 can be used to control transmission and reception operations of optical signals. Therefore, if you select two arbitrary optical communication control devices, connect them to a general operation console, and instruct communication from the control section 16 to the communication control section 15,
Communication using the second optical transmission line becomes possible between the two optical communication control devices, and testing and diagnosis of the second optical transmission line becomes possible by transmitting and receiving various data.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to realize a communication system in which test and diagnosis of the secondary optical transmission line can be performed at any time without interfering with communication through the main optical transmission line, and also to realize Since any two communication control devices can be selected, by sequentially replacing the optical communication control devices, it is possible to limit the failure location of the optical transmission line.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a communication system showing an embodiment of the present invention, FIG. 2 is a block diagram of an optical communication control section of an optical communication control device of the present invention, and FIG. 3 is a block diagram of a conventional optical communication control device. FIG. 3 is a block diagram of an optical communication control section. 1.2, 3, 4.5... Optical communication control device, 6.9...
- Optical receiver, 7, 8... Optical transmitter, 10, 11, 12
．． 13...Selector, 14.15...Communication control unit,
16...Control unit, 17...Interface terminal.

Claims (1)

[Claims] A communication system comprising a plurality of optical communication control devices and an optical transmission path connecting the plurality of optical communication control devices in a ring shape, the optical transmission path including a first transmission/reception optical cable and a second transmission/reception optical cable. a first optical transmitter/receiver for the first optical transmitter/receiver cable, a second optical transmitter/receiver for the second optical transmitter/receiver cable, and a communication control unit that performs input/output processing of signals with the optical transmitter/receiver; a selector that is located between the optical transmitter/receiver and the communication controller and switches connections between the communication controller, the first optical transmitter/receiver, and the second optical transmitter/receiver according to a switching signal;
An optical communication control device comprising a control unit that transmits and receives data to and from the communication control unit and sends the switching signal to the selector, comprising a first communication control unit and a second communication control unit. and the selector switches between the first optical transmitter/receiver and the second optical transmitter/receiver and the first communication controller and the second communication controller in response to the switching signal from the controller. An optical communication control device characterized by comprising means for arbitrarily and simultaneously switching the connection between the transmitter and the receiver in the first optical transmitter/receiver and the second optical transmitter/receiver.