2M optical signal transparent transmission device and 2M optical signal transparent transmission method applied to SDH (synchronous digital hierarchy) network

Abstract

The invention discloses a 2M optical signal transparent transmission device and a 2M optical signal transparent transmission method applied to an SDH (synchronous digital hierarchy) network and relates to SDH systems. The device comprises a 2M optical module, a clock recovery module, a multiplexing / mapping module and a demultiplexing / demapping module, wherein the 2M optical module is connected with the clock recovery module, an upper direction of the clock recovery module is connected with the multiplexing / mapping module, a down direction of the clock recovery module is connected with the demultiplexing / demapping module, the 2M optical module is used for completing photoelectric conversion, the clock recovery module forms 2M bit / s NRZ (non-return-to-zero) code streams and clock signals when used for performing clock regeneration and code stream retiming of 2M data code streams, the multiplexing / mapping module is used for completing 2Mb / s NRZ->TU12->VC12->VC-4 mapping, and the demultiplexing / demapping module is used for completing demapping of VC-4->VC12->TU12->2Mb / s NRZ. By the 2M optical signal transparent transmission device and the 2M optical signal transparent transmission method, transparent transmission of 2M optical signals on the SDH network and network management monitoring of the 2M optical signals can be achieved, and stability is improved while cost is lowered.

Description

technical field [0001] The present invention relates to an SDH (Synchronous Digital Hierarchy, synchronous digital series) system, in particular to a 2M optical signal transparent transmission device and method applied to an SDH network. Background technique [0002] At present, the application of optical fiber differential protection in power systems is becoming more and more extensive. On 220kV and 500kV lines, optical fiber differential protection is used as the main relay protection method. When the differential protection signal needs to be transmitted between the protection devices through the SDH network, since there is no unified optical interface that can realize direct connection between the protection device and the communication SDH equipment, between the protection device and the communication SDH equipment, generally by adding MUX2M (Multiplexer 2M, 2M multiplexer) and other photoelectric conversion equipment are used to achieve interface matching, which not on...

AI Technical Summary

Problems solved by technology

When the differential protection signal needs to be transmitted between the protection devices through the SDH network, since there is no unified optical interface that can realize direct connection between the protection device and the communication SDH equipment, between the protection device and the communication SDH equipment, generally by adding MUX2M (Multiplexer 2M, 2M multiplexer) and other photoelectric conversion equipment are used to achieve interface matching, which not only has poor stability, but also increases costs, and also prevents the optical signal of the protection device from being included in the network management of the optical transmission system, making the 2M optical The signal cannot be transparently transmitted on the SDH network, which brings difficulties to power supply, grounding, wiring, troubleshooting, debugging, etc.

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