| 摘要 |
A network device is provided, the network device connected to a local exchange, and comprising a main interface system, a backup interface system, and a management system. The main interface system comprises a main transceiving module that receives an instruction from the local exchange, and transmits time information in the main interface system to the backup interface system. The backup interface system comprises a backup transceiving module, a backup counting module, and a backup starting module. The backup transceiving module determines whether a replacement message is received from the management system, and transmits an acknowledgement message to the local exchange if the replacement message is received. The backup counting module counts time from receiving the instruction from the local exchange to transmitting the acknowledgement message thereto. The backup starting module starts the backup counting module according to counted time. A time synchronization method is also provided.
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