Quidway® NetEngine 80 Core Router Switching Network Board
Copyright ©2007 Huawei Technologies Co., Ltd. All Rights Reserved.
http://www.huawei.com/products/datacomm/
2
z
Provide highly precise and reliable SDH line interface clock signals (38.88 MHz) to interface
boards.
z
Have four working modes: fast tracking, normal (tracking), hold and free-run.
z
Have rough tune and fine tune function, realizing on-site frequency adjustment.
z
Enable synchronization performance detection, alarming and control.
z
Have two synchronous link input interfaces, realizing automatic switchover without causing
phase variation.
z
Communicate with the MPU through active and standby HDLC links, to be monitored,
configured and managed by the MPU.
Specifications
The NETB has four external interfaces: two external timing source input interfaces and two internal
timing source output interfaces.
Module
name
Interface name
Interface type
Description
External timing source
input interface
Quantity: 2, SMB
interfaces
Timing source can be acquired
from BITS. Interfaces can be set
to 2048 Kbps or 2048 KHz.
CR-NETB
Internal timing source
output interface
Quantity: 2, SMB
interfaces
Provide reference clock to
downstream equipment.
Interfaces can be set to 2048
Kbps or 2048 KHz.
