Special network switching method and equipment with synchronous digital hierarchy (SDH) network accurate clock synchronization function
A dedicated network and network technology, applied in the field of data exchange, can solve the problems of uncalculated delay and delay jitter, difficult to join, etc., to achieve real-time synchronous sampling, continuous operation, and accurate network time synchronization.
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[0015] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.
[0016] Implementation of the present invention comprises the following steps:
[0017] (1). After the switch receives the SYNC message from the master clock, it records the received time stamp t1 of the message through the CPU in the switch, and then forwards the SYNC message to each interface according to the configuration and interface status, and the switch chip simultaneously Record the time stamp t2 of the forwarded sync message output from each network interface.
[0018] (2). According to the configuration, the switch converts some Ethernet packets into OC-3 / STM-1 interfaces through the EOS chip, and at the same time, the FPGA records the time of the packets by receiving the network interface packets and the EOS Serdes interface packe...
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