JPH04273733A - Optical relay transmission system - Google Patents

Abstract

PURPOSE:To offer an optical relay transmission system with simple circuit configuration and easy to increase the number of monitoring items. CONSTITUTION:Information is encoded to a binary number based on a binary code rule by a monitoring information encoder part 15, and the bit interval of CMI violation of a principal signal is controlled by a transmission counter part 14 according to such encoded monitoring information. Also. the CMI violation is added on the principal signal by a CMI violation insertion part 12 under the control of the transmission counter part 14, and the CMI violation of the principal signal is detected by a CMI violation detecting part 16. Furthermore, the bit interval of the CMI violation detected by the CMI violation detecting part 16 is counted by a reception counter part 17. Original monitoring information can be reproduced from the count value of the bit interval counted by the reception counter part 17 by a monitoring information decoder part 18.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is based on CMI (Coded
The present invention relates to an optical relay transmission system that uses a Mark Inversion code signal as a main signal, and particularly relates to an optical relay transmission system that superimposes monitoring information on the main signal and transmits it.

0002

2. Description of the Related Art A conventional supervisory signal transmission system of this type will be explained with reference to FIGS. 4 to 6. FIG. 4 shows the configuration of an optical relay transmission system. An optical relay transmission system consists of an optical terminal section (transmission) 1 that encodes an input electrical signal using CMI, converts it into an optical signal, and sends it out, and an optical terminal section (transmission) 1
The optical relay section 2 receives the optical signal from the optical relay section 2, identifies the optical signal, reproduces it, and then outputs it again as an optical signal. It is comprised of an optical terminal section (receiving) 3 which decodes the CMI code after reproduction and outputs it as the original electrical signal.

FIG. 5 shows a concrete configuration of the optical repeater section 2 and the optical terminal section (receiving) section 3 in FIG. 4. In the figure, monitoring information ALM1 to ALM5 are multiplexed by a monitoring information multiplexing section 22, and a frame pulse F is inserted by a frame pulse inserting section 21, thereby creating a monitoring signal having the data structure shown in FIG. This monitoring signal is sent to the main signal output from the optical receiver 11 by the CMI violation inserter 12.
A CMI violation that disturbs the I code rule is added to create the main signal frame shown in FIG. 6. This main signal frame is converted into an optical signal by the optical transmitting section 13, and the optical terminal section (receiving)
Sent on 3rd.

[0004] In the optical terminal unit (reception) 3, the optical signal from the optical repeater unit 2 is converted into an electrical signal by the optical receiver unit 11, and then
A CMI violation is detected by the CMI violation detection unit 16, and the monitoring signal shown in FIG. 6 is reproduced. The supervisory signal synchronizer 23 establishes frame synchronization of the supervisory signal, and the supervisory information separator 24 reproduces the original supervisory information ALM1-5 from the supervisory signal.

[Problems to be Solved by the Invention] As described above, in the conventional optical relay transmission system, a circuit for multiplexing the monitoring information into a monitoring signal having a frame structure and a circuit for separating the monitoring signal are required. The problem was that it became complicated.

Another problem is that since the frame structure of the monitoring signal is predetermined, the frame structure of the monitoring signal must be changed when increasing the number of monitoring items.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an optical relay transmission system that has a simple circuit configuration and can easily increase the number of monitoring items.

[0007]

[Means for Solving the Problems] The optical relay transmission system of the present invention includes a monitoring information encoding means for encoding monitoring information into binary numbers based on a predetermined binary code rule, and a monitoring information encoding means. transmission counter means for controlling the CMI violation bit interval of the main signal according to monitoring information encoded by the CMI violation insertion means for adding a CMI violation to the main signal under the control of the transmission counter means; CMI violation detection means for detecting a CMI violation of the main signal to which CMI violation has been added; reception counter means for counting the bit interval of CMI violations detected by the CMI violation detection means; The monitoring information decoding means decodes the counted value of the bit interval based on the binary code rule and reproduces and outputs the original monitoring information.

[0008]

[Operation] In the optical relay transmission system having the above configuration, the monitoring information encoding means encodes the CMI biosignal of the main signal into a binary number based on the binary code rule, and the transmission counter means converts the CMI biosignal of the main signal according to the encoded monitoring information. The bit spacing of the rations is controlled. Also, under the control of the transmission counter means, CMI violation insertion means adds C to the main signal.
An MI violation is added to the main signal, and a CMI violation of the main signal to which the CMI violation is added is detected by a CMI violation detection means.

Further, the bit interval of the CMI violation detected by the CMI violation detection means is counted by the reception counter means. The count value of the bit interval counted by the reception counter means is decoded by the monitoring information decoding means based on the binary code rule, and the original monitoring information is reproduced. Therefore, the circuit configuration can be simplified and the number of monitoring items can be easily increased.

0010

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of an embodiment of an optical relay transmission system according to the present invention. In the figure, the optical relay transmission system includes an optical repeater section 2 and an optical terminal local section (reception) 3. The optical repeater 2 includes an optical receiver 11 , a CMI violation inserter 12 , an optical transmitter 13 , a transmission counter 14 , and a monitoring information encoder 15 .

The optical terminal section (receiving) 3 has an optical receiving section 11 , a CMI violation detecting section 16 , a receiving counter section 17 , and a monitoring information decoding section 18 .

In the above configuration, the monitoring information ALM1 to ALM5 are input to the monitoring information encoding unit 15,
5, the monitoring information ALM1 is based on the encoding rule shown in FIG.
~5 are each assigned a number of binary digits and encoded into a binary number. The encoded supervisory signal is sent to the transmission counter unit 14, and the transmission counter unit 14 calculates the number of codes of the supervisory signal with respect to the main signal input from the optical receiver 11 to the CMI violation insertion unit 12. A control signal is output to the CMI violation insertion unit 12 to control the addition of CMI violations at the same bit interval as shown in FIG. The main signal to which the CMI violation has been added by the CMI violation insertion section 12 is converted into an optical signal by the optical transmission section 13 and output to the optical terminal local section (receiving) 3.

On the other hand, in the optical terminal local section (receiving) 3, the optical signal is converted into an electrical signal by the optical receiving section 11, and a CMI violation is detected by the CMI violation detecting section 16. Furthermore, the reception counter unit 17 counts the bit interval of the detected CMI violation, and the counting result is sent to the supervisory information decoding unit 18 as the code number of the supervisory signal. The monitoring information decoding section 18 decodes the monitoring signal based on the code rule shown in FIG. 2, and reproduces the original monitoring information.

[0015]

[Effects of the Invention] As explained above, according to the optical relay transmission system of the present invention, monitoring information is encoded in binary numbers, and CMI violations are added to the main signal at bit intervals corresponding to the number of encoded numbers. This eliminates the need for the complex circuit configurations of a monitoring information multiplexing section, monitoring information separation section, frame pulse insertion section, and monitoring signal synchronization section that were required in conventional optical relay transmission systems. This has the effect of simplifying the circuit configuration.

Furthermore, an increase in the number of monitoring information items only increases the CMI violation interval of the main signal, and there is no need to change the basic configuration of the system, and the number of monitoring items can be selected to any value.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of an optical relay transmission system according to the present invention.

[Fig. 2] An explanatory diagram showing the contents of the binary encoding rule applied to the embodiment shown in Fig. 1.

[Figure 3] A frame configuration diagram of CMI violation applied to the embodiment shown in Figure 1.

[Figure 4] Block diagram showing the schematic configuration of a general optical relay transmission system

[Figure 5] Block diagram showing the configuration of a conventional optical relay transmission system

[Fig. 6] A configuration diagram of a monitoring signal and a CMI violation frame applied to the conventional optical relay transmission system shown in Fig. 5.

[Explanation of symbols]

1 Optical terminal local section (transmission) 2 Optical relay section 3 Optical terminal local section (reception) 11 Optical reception section 12 CMI violation insertion section 13 Optical transmission section 14 Transmission counter section 15 Monitoring information encoding section 16 CMI violation detection section 17 Reception Counter section 18 Monitoring information decoding section

Claims (1)

[Claims] 1. Monitoring information encoding means for encoding monitoring information into binary numbers based on a predetermined binary code rule, and CMI of a main signal according to the monitoring information encoded by the monitoring information encoding means. a transmission counter means for controlling a bit interval of a violation, and a CMI violation for adding a CMI violation to the main signal under the control of the transmission counter means;
an MI violation insertion means; a CMI violation detection means for detecting a CMI violation of a main signal to which a CMI violation has been added;
a reception counter means for counting the bit interval of the CMI violation detected by the violation detection means; and a reception counter means for counting the bit interval of the CMI violation detected by the violation detection means, and decoding the count value of the bit interval counted by the reception counter means based on the binary code rule, An optical relay transmission system comprising: monitoring information decoding means for reproducing and outputting monitoring information.