JPS63203027A - Optical relay transmission system - Google Patents

Abstract

PURPOSE:To eliminate the need for any interposed copper wire for an optical cable by utilizing a specific location of monitor information due to the code rule violation of code mark inversion (CMI) so as to send the supervising information as an optical signal through the optical fiber in sending the supervision information. CONSTITUTION:An optical transmitter 11 applies E/O conversion to major information 13 assigned by supervising information 14, 15 and the result is outputted to an optical relay transmitter 2. The transmitter 2 uses an optical receiver 22 to receive the information, which is subject to O/E conversion, and supervising information 25 is assigned to a position next to a special position on which the information 15 is assigned. The result is subject to E/O conversion by an optical transmitter 21 and relayed to an optical relay transmitter 3 via an optical fiber 6. The transmitter 3 assigns the supervising information 35 at a special position similarly, and applies E/O conversion thereto and relays it to an optical terminal station equipment 4. An optical receiver 42 receives it, applies O/E conversion and analyzes supervising information 14, 15, 25, 35 assigned to each special position with respect to the major information 13 according to a prescribed format. As a result, the information 14, 15, 25, 35 of the optical terminal station equipment 1 and the transmitters 2, 3 is sent to the equipment 4 through the optical fiber 6 only without employing any interposed copper wire.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an optical relay transmission system that performs relay transmission of digital signals using optical fibers.

[Prior Art] Fig. 3 is a system diagram showing a conventional optical relay transmission system, and in the figure, 1.4 is an advanced station device, 2 is an optical relay transmission device,
10.40.20, 120 is an optical transmitting/receiving device in the tip station device 1.4 or the optical relay transmission device 2, 11,141
, 21, 121 are the optical transmitting/receiving devices 10, 40.20,
Optical transmitters configuring 120, 112, 42, 22, 12
2 is also an optical receiver, 19, 49.29 is a monitoring device in the optical terminal equipment 1.4 or the optical relay transmission equipment 2, 6 is an optical transmitter I1.21, 141.121 and an optical receiver 22,
Optical fiber connecting between 42, 122, 112, 8
13. 143 is the main information input to the optical transmitter 11 or 141. 43, 113 is the optical receiver 42 or 112. Main information output from 14.44
is monitoring information from the monitoring device 19 or 49; 15. I
45.115.45 is from the optical transmitter 11, 141 or the optical receiver 112.42 to the monitoring device 19 or 4
Monitoring information 25, 125 is transmitted from the optical transmitter 21 or 121 and the optical receiver 22 or 122 to the monitoring device 2.
This is monitoring information for 9.

Next, the operation will be explained. Here, a case will be described in which digital signals are transmitted in the direction from the optical terminal equipment 1 to 4. The optical transmitter 11 of the tip station device l performs electrical-to-optical conversion (hereinafter referred to as B10 conversion) of the input main information I3,
It is output to the optical relay transmission device 2 via the optical fiber 6. In the optical relay transmission device 2, an optical receiver 22 performs optical-to-electrical conversion (hereinafter referred to as O/E conversion), and then an optical transmitter 21
The signal is converted into B10 at the optical fiber 6 and relayed to the optical terminal device 4 via the optical fiber 6. In the tip station device 4, this is O/E converted by the optical receiver 42 and output as main information 43.

Here, the optical transmitter 11 and the optical receiver 112 of the tip station device 1
The monitoring information 15 and 115 from
Furthermore, it is also transferred to the optical terminal device 4. Further, the monitoring information 25 from the optical transmitter 21 and the optical receiver 22 of the optical relay transmission device 2, and the monitoring information I25 from the optical transmitter 121 and the optical receiver 122 are displayed on the monitoring device 29, and It is transferred to the tip station device I or 4 via the copper wire 8.

[Problems to be Solved by the Invention] Since the conventional optical relay transmission system is configured as described above, the intervening copper wire 8 for transmitting the monitoring information 15, 25, 115, etc. in the optical cable is indispensable. Not only does this lead to an increase in the cost of optical cables, but monitoring information15, 25,
115 etc. are transmitted as electrical signals within the intervening copper wire 8, which poses a problem in that they are susceptible to the effects of induction and the like, resulting in a decrease in reliability.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an optical relay transmission system that can transmit highly reliable monitoring information using a low-cost optical cable.

[Means for Solving the Problems] The optical relay transmission system according to the present invention converts the code using a code mark inversion (hereinafter referred to as CMI) code and transmits the data from the default to the receiving end station device. In the main information to be transmitted, each monitoring information of the optical terminal equipment and optical relay transmission equipment on the transmitting side is assigned in a predetermined format to a specific position where a CMI coding rule violation is added, and this is transmitted. It is.

[Operation] The optical relay transmission system of the present invention utilizes the specific position of the CMI code rule violation to transmit the monitoring information, so that the monitoring information is transmitted as an optical signal through the optical fiber, and the intervening copper wire of the optical cable is transmitted. is no longer necessary.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
In the figure, 1.4 is the tip station equipment, 2 is the optical relay transmission equipment, 10, 20, 120.40 is the optical transceiver equipment, 11, 2
1, 121, 141 are optical transmitters, 112, 22, 122
．． 42 is an optical receiver, 6 is an optical fiber, 13, 113, 4
3,143 is main information, 14,114,15,25,12
Reference numerals 5, 44, 144, and 145 are monitoring information, which are the same as, or equivalent to, those in the prior art denoted by the same reference numerals in FIG. 3, so a detailed explanation will be omitted.

Further, 3 is an optical relay transmission device having the same configuration as the optical relay transmission device 2 and arranged between the optical relay transmission device 2 and the optical terminal equipment 4, and 30 and 130 are optical transmitting and receiving devices. , 31,131 is an optical transmitter, 32.132 is an optical receiver,
35,135 is monitoring information.

Next, the operation will be explained. Here again, transmission in the direction from optical terminal equipment 1 to 4 will be explained as an example. First, the tip station device 1 assigns the monitoring information 14 and 15 to the input main information 13. That is, the main information 13 has been code-converted using the CMI code, and this monitoring information 14.15 is assigned to a specific position 16 to which the code rule violation has been added, as shown in FIG. Specifically, for example, the monitoring information 14 is sequentially allocated to the specific position 16 that follows the specific position 16 to which the synchronization sub-information 17 is allocated, and the monitoring information 15 is sequentially allocated to the specific position 16 that follows that. In this way, the optical transmitter 11 transmits the monitoring information 14. ．． The main information 13 to which 15 is assigned is converted into E10 and output to the optical relay transmission device 2.

In the optical relay transmission device 2, this is received by the optical receiver 22 and is 0.
/E conversion, the monitoring information 25 is further allocated to the specific position 16 following the specific position 16 to which the monitoring information 15 has been allocated, and this is converted to E10 by the optical transmitter 21 and transmitted via the optical fiber 6. It is relayed to the optical relay transmission device 3.

In the optical relay transmission equipment 3, in exactly the same way, this is converted to 0/E, the monitoring information 35 is assigned to the specific position 16 that comes after the specific position 16 to which the monitoring information 25 has been assigned, and the optical terminal equipment converts it to E10. Relay to 4. In the tip station device 4, this is received by the optical receiver 42, O/E converted, and the monitoring information 14, 15, 2 assigned to each specific position is added to the main information 13.
5.35 is decomposed according to a predetermined format. Second
The lower part of the figure shows monitoring information decomposed according to this predetermined format. 18 in the figure is unused sub information.

As a result, the optical terminal equipment 1. Monitoring information 14, 15, 25.35 of optical relay transmission equipment 2.3 does not use intervening copper wires,
The signal is transmitted to the optical terminal device 4 only through the optical fiber 6.

In the above embodiment, a digital signal is transmitted by relaying two optical relay transmission devices, but the number of optical relay transmission devices may be one or three or more.

Also, the format of the main information and monitoring information may be
What is shown in FIG. 2 is one example, and the order, number, etc. of the signals may be changed, and in any case, the same effects as in the above embodiment can be achieved.

[Effect of the invention] As described above, according to this invention, CMI in main information
Since the configuration is configured such that each piece of monitoring information is assigned and transmitted in a predetermined format to a specific position where a code rule violation has been added, it is possible to transmit the monitoring information as an optical signal through an optical fiber, and it can be transmitted from an optical cable. This has the effect of eliminating copper wires, reducing costs, and providing a highly reliable optical relay transmission system that is resistant to noise because it is not affected by induction or the like.

[Brief explanation of the drawing]

Figure 1 is a system diagram showing an optical relay transmission system according to an embodiment of the present invention, Figure 2 is an explanatory diagram showing the format of its main information and monitoring information, and Figure 3 is a system diagram showing a conventional optical relay transmission system. It is a diagram. 1.4 is the tip station equipment, 2 and 3 are the optical relay transmission equipment, 6 is the optical fiber, 13, 43, 113, 143 are the main information, 16
is a specific position, 14.15, 25.35.44, 114,
125, 135, 144.145 is monitoring information. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. (outside 26 no

Claims (1)

[Claims] An optical relay transmission device is placed between the optical terminal equipment, and the optical fibers are used to connect them, and the main information converted by the code mark inversion code from the optical terminal equipment on the transmitting side is sent to the receiving side. In the optical relay transmission system for transmitting data to the optical terminal equipment of the transmitting side, the transmitting side optical terminal equipment, the optical relay An optical relay transmission method characterized by sequentially allocating and transmitting each monitoring information of a transmission device.