Clock chain circuit automatic protection method in packet transmission network

Abstract

The invention discloses an automatic protection method for a clock link in a packet transfer network. The method comprises: the synchronous state message of the clock is expanded to allow the synchronous state message to comprise a clock identifier, a clock quality rating, a number of network elements where the clock passes, a clock alarm instruction, a prohibited use identifier; each network element in the clock link processes the synchronous state message of the clock; and the each network element selects the clock source based on the synchronous state message of the clock. With the inventive method, the network element can automatically select the optimal route clock, prohibit the non-optimal route clock to participate in the selection, and efficiently prevent the ring formation of the clock.

Description

technical field [0001] The invention belongs to the communication field, in particular to a method for automatic protection of a clock link in a packet transmission network. Background technique [0002] The packet transport network was initially used for data services without synchronization requirements, but with the evolution of the network, the packet transport network not only needs to transmit data services, but also needs to transmit time division multiplexing (TDM) services, so the packet transport network needs to solve the synchronization problem . [0003] In the G.8261 / Y.1361 proposal, the International Telecommunication Union Telecommunication Standardization Sector (ITU-T) defines some concepts about clock synchronization and network configuration methods in the packet transport network, and proposes to refer to ITU for the clock synchronization status message (SSM). -T G.707 Recommendation for definition and use. However, the description of SSM in the G.707 ...

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Problems solved by technology

[0004] In G.707, the definition content of SSM message is relatively simple, which leads to the fact that in the case of complex networking, the quality level of the line clock extracted by some nodes is not optimal, such as the shortest clock path; there are multiple reference clocks in the network, and a certain When a clock fails, clock looping may also occur

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