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Configuration Guide - Device Management

S7700 and S9700 V200R013C00

This document describes the configurations of Device Management, including device status query, hardware management, CSS, SVF, PoE, OPS, OIDS, energy-saving management, information center, fault management, NTP, synchronous ethernet, PTP.
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Application Scenarios for PTP

Application Scenarios for PTP

PTP Application on a Transmission Network

Most of the time-division multiplexing (TDM) service on a traditional fixed network is the voice service. If the clocks on two ends of the transmission network are different, the accumulated difference between the clocks will cause clock slip. In Figure 14-11, an ordinary clock (OC) device encapsulates high-precision clock information obtained through the GPS into a PTP message and sends the PTP message to a boundary clock (BC) device on the transmission network. Core devices on the transmission network function as transparent clock (TC) devices to transparently transmit the clock information to the entire transmission network. Then the edge devices of the transmission network function as BC devices to provide the high-precision clock information obtained through the PTP message to wireless access devices, such as NodeB and radio network controller (RNC).

Figure 14-11  Application of PTP on a transmission network

Network Protection

PTP supports protective switchover between devices and between components on the same device to prevent single-point failures. In Figure 14-12, the solid lines identify the primary clock tracing path. The time source is provided by GPS-1 and is transmitted to the lower layers in the direction shown by the blue arrows. The dashed lines identify the protection path. When the primary path is faulty, GPS-2 can replace GPS-1 to provide the time source rapidly.

Figure 14-12  Protective switchover on the time synchronization network

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Updated: 2019-04-20

Document ID: EDOC1100065738

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