Method, device and storage medium for realizing precise time protocol delay request message

Abstract

The invention discloses a method, a device and a storage medium for realizing a delay request message of a precise time protocol, including recording the message time, identifying a PTP message, and judging whether it is a one-step Delay Req message according to the identified PTP message type information; The correction field field of the Delay Req message is processed in the receiving direction for a one-step Delay Req message, and the start timestamp is set as the arrival time stamp; the start time is read when a new correction field is set for a one-step Delay Req message in the sending direction. The arrival timestamp of the record in the stamp field. The present invention realizes the one-step mode processing of the Delay Req message on the TC. The delay error on the PHY is eliminated, and the upper-layer module does not need to participate in the processing of the PTP Delay Req message forwarded by the local TC, which simplifies the implementation difficulty of the TC. The modification of the PTP Delay Req message on the TC is implemented in the physical layer, which improves the time accuracy and does not require the upper-layer module to participate in the PTP message processing, which reduces the difficulty of system development and reduces product development and maintenance costs.

Description

technical field [0001] The invention belongs to the field of Ethernet, and in particular relates to a method for realizing a delay request message of a precise time protocol. Background technique [0002] The Precision Time Protocol (PTP) defined by IEEE1588 is a widely used time synchronization technology solution. The need for time synchronization of the distribution network. PTP calculates and recovers the local clock and frequency by recording the time stamps of specific PTP protocol packets arriving and leaving the device. 1588v2 has 3 clock modes: normal clock (OC), boundary clock (BC) and transparent clock (TC). [0003] The End-to-End Transparent Clock (E2ETC) directly forwards the non-peer (Peer-to-Peer, P2P) type PTP protocol packets in the network, and participates in calculating the delay of the entire link. The E2ETC needs to add the local residence time (residenceTime) and subtract the time of the egress delay asymmetry correction (delayAsymmetry) in the cor...

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Problems solved by technology

[0011] The purpose of the present invention is to provide a method for implementing the delay request message of the precise time protocol; to solve the problem that the main scheme of TC for implementing PTP is difficult to implement, and the error caused by the PHY cannot be completely eliminated, resulting in limited improvement of time accuracy. The physical layer realizes the one-step forwarding mode of PTP TC to Delay Req message, which not only improves the PTP time accuracy, but also simplifies the design of TC equipment system

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