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Configuration Guide - Device Management

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of Device Management, including device status query, hardware management, Information Center Configuration, NTP, Synchronous Ethernet Configuration, Fault Management Configuration, Energy-Saving Management Configuration, Performance Management Configuration, Maintenance Assistant Configuration, and OPS Configuration.
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Clock Signal Transmission Modes

Clock Signal Transmission Modes

Transmitting Clock Signals Through Clock Interfaces

A switch obtains clock signals from an external clock source through its clock interfaces or transmits its clock signals to other devices.

Currently, a switch provides two building integrated timing supply (BITS) interfaces: BITS0 and BITS1. BITS0 is used to input/output clock signals, while BITS1 is used to input/output time signals. BITS interfaces between two devices are connected using clock cables. For details about BITS interfaces and clock cables, see "CE-MPUA-E (Main Processing Unit)" and "Clock Cable" in the Hardware Description (CE12800E).

In Figure 5-12, clock signal input/output interfaces of the external clock, Device1, Device2, and Device3 are connected using clock cables. Device1 traces the external clock, Device2 traces the clock of Device1, and Device3 traces the clock of Device2. The three devices then synchronize the time with the external clock.

Figure 5-12 Transmitting clock signals through clock interfaces

Transmitting Clock Signals Through Ethernet Links

Master clock information is transmitted using bit streams of Ethernet line signals. Other devices extract the clock information from the Ethernet line signals through the clock chip, and then trace and lock the master clock. This is one of the most commonly used clock synchronization methods. It uses the existing Ethernet link for clock synchronization, removing the need to construct a dedicated clock synchronization network.

In Figure 5-13, Ethernet interfaces of the external clock, Device1, Device2, and Device3 are connected through Ethernet links. Device1 traces the external clock, Device2 traces the clock of Device1, and Device3 traces the clock of Device2. The three devices then synchronize the time with the external clock.

Figure 5-13 Transmitting clock signals through Ethernet links
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Updated: 2019-04-20

Document ID: EDOC1100074722

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