Resilient packet ring business board, system and clock information selecting method

Abstract

The disclosed system of flexible packet ring traffic board (FPRTB) includes at least two pieces of FPRTB. Each traffic board includes following parts: clock drive device is in use for converting one route of clock signal of FPRTB to at least two routes of clock signal, and one route of clock signal in the said two routes of clock signal is sent to board, where there is clock signal selection device (CSSD), and the other clock signal is sent to other boards; CSSD selects out one route of clock signal as source clock signal from the received clock signals. The invention also discloses FPRTB and clock selection method. The invention solves issue of traffic loss caused by clock skewing.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to an elastic packet ring service board, a system and a method for selecting a clock signal. Background technique [0002] Resilient Packet Rings (RPR, Resilient Packet Rings) is a metropolitan area network technology. Data packets and control packets can be transmitted on a bidirectional ring network, and can carry Ethernet, Asynchronous Transfer Mode (ATM, Asynchronous Transfer Mode), Internet Protocol (IP, Internet Protocol) voice, IP video and virtual private network (VPN, Virtual Private Network) and other services. RPR can be configured as an elastic grouping ring with 256 stations and a maximum length of 2000 kilometers. According to the RPR chip, the ring network can provide 622M, 1G, 2.4G and 10G shared bandwidth. RPR protocol support: ring network bandwidth reuse, to maintain the maximum bandwidth utilization; when the ring network is congested, nodes are guarantee...

AI Technical Summary

Problems solved by technology

Solve the problem of crystal oscillator accuracy deviation due to the interconnection of different clock sources in multiple RPR systems in the prior art

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