Method for synchronizing network clock stamps

Abstract

The invention discloses a method for synchronizing network clock stamps. The method comprises the following steps: firstly local end equipment sends beacon frame to customer premise equipment in the fixed time position of the downlink time period of one period, the local end equipment, wherein the time from sending beacon frame to the customer premise equipment by the local end equipment to receiving beacon frame by the customer premise equipment is tds and beacon frame is different to GATE frame; the customer premise equipment sends REPORT frame to the local end equipment in the uplink time period of the period, wherein the time from sending REPORT frame to the local end equipment by the customer premise equipment to receiving REPORT frame is tus; calculating round trip time (RTT) which is equal to the sum of tds and tus, and synchronizing the clock stamps of the local end equipment and the customer premise equipment according to the calculated RTT. In the method of the invention, a beacon frame is inserted in the fixed time position of the downlink time period of the local end equipment, thus the difference of the RTTs obtained by calculations is greatly decreased. Therefore, the vibration of RTT can be greatly reduced, the occupied bandwidth can be lowered and accurate clock synchronization can be realized.

Description

technical field [0001] The present invention relates to a method for synchronizing network clock stamps. Background technique [0002] EOC (Ethernet Over COAX, Ethernet over coaxial cable transmission) is a point-to-multipoint network based on coaxial cable transmission of Ethernet frames, including a master device, multiple slave devices, and a master device and a slave device. or multiple taps or dividers, or both taps and dividers between master and slave devices. The master device is connected to a plurality of slave devices in a tree structure through a brancher or a distributor. The EOC network uses a TDM (Time Division Multiplexing, time division multiplexing) mode to control and manage the uplink communication of multiple client devices. There are one or more branchers or distributors between the central office equipment and the user equipment. The direction in which the central office equipment sends data packets to the customer end equipment is the downlink dire...

AI Technical Summary

Problems solved by technology

[0004] This basic scheme has the following disadvantages in terms of clock synchronization: in the burst data flow network, the uncertainty of the position of the MPCP protocol packet in the burst data flow will cause the central office equipment to perform RTT calculation, which will cause a large jitter

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