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Configuration Guide - Device Management

S9300, S9300E, and S9300X V200R012C00

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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Clock Signal Transmission Modes

Clock Signal Transmission Modes

Transmitting Clock Signals Through Clock Interfaces

A switch obtains clock signals through its clock interfaces from external clock sources or outputs local clock signals to other devices.

Currently, a switch provides two BITS interfaces that connect to other devices through clock cables. The switch uses these interfaces to obtain clock signals from external clock sources or output clock signals to other devices. For details about BITS interfaces and clock cables, see Clock Cable and LE0D00CKMA00-Clock Pinch Board-1588 in Hardware Description.

As shown in Figure 12-5, the clock signal input/output interfaces of the external clock, Device1, Device2, and Device3 are connected through clock cables. Device1 traces the external clock, Device2 traces the clock of Device1, and Device3 traces the clock of Device2. This ensures that the three devices synchronize the time with the external clock.

Figure 12-5  Transmitting clock signals through clock interfaces

Transmitting Clock Signals over Ethernet Links

A master clock can transmit clock signals over Ethernet links. Other devices use their clock chip to read these signals, and then trace and lock the master clock. This is the most commonly used clock synchronization mode because it does not require a dedicated clock synchronization network.

As shown in Figure 12-6, the Ethernet interfaces of the external clock, Device1, Device2, and Device3 are connected over Ethernet links. Device1 traces the external clock, Device2 traces the clock of Device1, and Device3 traces the clock of Device2. This ensures that the three devices synchronize the time with the external clock.

Figure 12-6  Transmitting clock signals over Ethernet links
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Updated: 2018-09-03

Document ID: EDOC1100038289

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