A method and system for preventing erroneous overhead byte delivery

Abstract

The invention discloses a method and a system for preventing transfer of error overhead bytes. The method comprises the following steps: taking a clock signal, a light loss alarm signal and a line alarm signal as input signals of a digital logic circuit, and performing a logic OR operation on the light loss alarm signal and the line alarm signal to get an alarm clock function; delaying the light loss alarm signal by n clock cycles to get a delay function; performing a logic OR operation on the alarm clock function and the delay function to get an overhead transfer enable signal OH_EN; and controlling on-off of an overhead byte transfer channel according to whether the level of the overhead transfer enable signal OH_EN is high or low. According to the invention, when an optical signal line fails, transfer of overhead bytes can be cut off effectively, error overhead bytes can be prevented from being transferred to downstream modules, the phenomenon that equipment makes wrong judgment and action due to reception of error overhead bytes is avoided, and the state machine of the equipment can run normally. The scheme is implemented based on hardware, and CPU resources are saved.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a method and system for preventing error overhead byte transmission. Background technique [0002] In SDH (Synchronous Digital Hierarchy, Synchronous Digital System), OTN (Optical Transport Network, Optical Transport Network) technical system, in order to ensure the normal and flexible transmission of information payload, in addition to the information payload in the frame structure of the optical signal, it is also set A wealth of overhead bytes is used for network operation, management and maintenance. Network devices (SDH equipment, OTN equipment) use these overhead bytes to transmit various monitoring, management and control information, such as signal quality monitoring, connection status confirmation, Protection switching control signaling, etc. [0003] In the receiving end equipment, the process of processing the overhead bytes is usually: use the photoelec...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to solve that when the optical signal line fails, the existing way of closing the transmission channel of the overhead byte cannot completely avoid the transmission of the wrong overhead byte to the downstream module, which may cause the equipment to produce wrong judgments and actions , and the implementation of software has the problem of increasing the workload of the CPU

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