Transparent Transmission System of Service Clock in Optical Transport Network

Abstract

Disclosed is a service clock pass-through system in an optical transport network. The system comprises at least one service clock pass-through unit. The service clock pass-through unit comprises: a cache module for caching input service data; a generation module for obtaining a current waterline value of the cache module and generating a frequency adjustment signal according to the current waterline value of the cache module; a phase-locked loop for frequency-multiplying the received local clock signal to generate a reference clock signal; a parallel-serial conversion module for reading service data in the cache module; and an adjustment module for adjusting the reference clock signal according to the frequency adjustment signal to generate a frequency control signal, and controlling the speed of the parallel-serial conversion module for reading data from the cache module so that the data reading speed and the data writing speed of the cache module are in balance. The service clock pass-through system does not need to be additionally provided with a clock chip, and has a small size and low costs.

Description

technical field [0001] The invention relates to the technical field of optical transport network, in particular to a transparent transmission system of a service clock in an optical transport network. Background technique [0002] With the development of communication systems, OTN (Optical Transport Network, Optical Transport Network) has gradually become the mainstream of transmission networks. The business clock transparent transmission is a relatively common application scenario. [0003] In the current business clock transparent transmission system, an additional clock chip is usually installed outside the business chip, so as to use the clock chip to detect the data writing speed of the buffer in the business chip, and adjust its data reading speed according to the data writing speed of the buffer. In order to make the data writing speed and data reading speed of the buffer in a balanced state, and ensure the normal operation of the buffer and the normal operation of t...

AI Technical Summary

Problems solved by technology

[0003] In the current business clock transparent transmission system, an additional clock chip is usually installed outside the business chip, so as to use the clock chip to detect the data writing speed of the buffer in the business chip, and adjust its data reading speed according to the data writing speed of the buffer. In order to make the data writing speed and data reading speed of the buffer in a balanced state, and ensure the normal operation of the buffer and the normal operation of the business clock transparent transmission, the existing business clock transparent transmission system is relatively large in size and relatively expensive. high

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