Method and device for compensating for time path

摘要

Embodiments of the present disclosure relate to a method and a device for compensating for a time path. In the embodiments of the present disclosure, on the basis of not changing implemented 1588 synchronization architecture, a compensation unit is added on a service board unit, the compensation unit calculates a compensation time value for asymmetrical reception and transmission of fiber links and transfers the compensation time value into the service board unit, and the service board unit implements automatic compensation according to a port status. The method and the device for compensating for a time path according to the embodiments of the present disclosure may implement automatic compensation for receiving and sending fiber links without manually testing the asymmetry of links node by node, so that the embodiments of the present disclosure can be widely applied in time synchronization networks.

主权项

1. A method for calculating a path compensation time value in a first communication apparatus, wherein the first communication apparatus is connected to a second apparatus comprising a service board unit and a compensation unit through a first fiber and a second fiber, and the path compensation time value is used to compensate transmission delay asymmetry between transmission delay introduced by the first fiber and transmission delay introduced by the second fiber, the method comprising:
receiving a first time stamp comprised in a first data packet that is sent by the service board unit through the first fiber, wherein the first time stamp indicates the transmitting time of the first data packet; receiving a second time stamp comprised in a second data packet that is sent by the compensation unit through the second fiber, wherein the second time stamp indicates the transmitting time of the second data packet; calculating a transmission delay introduced by the first fiber according to the first time stamp, calculating a transmission delay introduced by the second fiber according to the second time stamp, and calculating the path compensation time value, wherein the path compensation time value equals to a half of a difference between the transmission delay introduced by the first fiber and the transmission delay introduced by the second fiber.