No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

S12700 V200R010C00 Configuration Guide - Device Management

This document describes the principles and configurations of the Device Management features, and provides configuration examples of these features.
Rate and give feedback:
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Overview

Overview

Definition

The Ethernet clock synchronization feature is used to synchronize the clock frequency on the Ethernet. The clock signal can be obtained from the circuit or received from the external BITS interface and transmitted to the downstream network through the Ethernet.

Purpose

Many telecommunications technologies require high precision clock frequency synchronization (as listed in Table 6-1) In the past, to synchronize the clock frequency on the telecommunications network, sites on the network obtained accurate clock signals from the Global Positioning System (GPS). Antennas need to be installed to receive clock signals from the GPS, which causes high construction and security costs. Ethernet clock synchronization enables the device to synchronize clock frequency from another site through an Ethernet network or obtain optimal clock signals from lines.

Table 6-1  Synchronization requirements of wireless technologies

Wireless Technology

Required Clock Frequency Accuracy

Required Phase Synchronization Accuracy

GSM

0.05 ppm

NA

WCDMA

0.05 ppm for the base station

NA

Pico 0.1 ppm

NA

TD-SCDMA

0.05 ppm

3 μs

CDMA2000

0.05 ppm

3 μs

WiMax FDD

0.05 ppm

NA

WiMax TDD

0.05 ppm

1 μs

Benefits

Using the Ethernet clock synchronization feature, you do not need to install antennas to obtain the clock frequency from the GPS. Clock signals can be transmitted from other sites through the Ethernet. This feature reduces network construction and maintenance costs and protects national security because it does not use the GPS.

Translation
Download
Updated: 2019-08-21

Document ID: EDOC1000142080

Views: 106756

Downloads: 141

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next