Quidway® NetEngine 80 Core Router Switching Network Board
Copyright ©2007 Huawei Technologies Co., Ltd. All Rights Reserved.
http://www.huawei.com/products/datacomm/
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Quidway® NetEngine 80 Core Router
Switching Network Board
Overview
The Switching Network Board (NETB) of the Quidway® NetEngine 80 core router (abbreviated to
NE80) not only realizes fast switching of data packets of fixed length on ports, but also provides
system level-3 synchronous clock.
The NE80 has 20 slots, of which two are for NETBs. One o r two NETBs are required fo r each NE80.
Two NETBs are recommended to implement redundancy backup to improve the reliability of the
system.
CR-NETB
The NETB realizes switching network functions.
z Adopt the switching mode of dynamic output buffer sharing.
z Realize non-blocking and self-routing data switching.
z Provide 16 input and output ports, achieving a total capacity of 128 Gbps.
z Have hardware flow control and back-pressure mechanism.
z Provide a temperature sensor for ambient temperature detection, collection, reporting and
alarming of the network board.
The NETB of the NE80 adopts a Virtual Output Queuing (VOQ) design to eliminate head of line
(HOL) blocking: setting output queues on the Line Processing Units(LPU) uplink to implement
shared buffer, and deploying a greater Buffer on the LPU downlink to receive data from the
switching network.
The NETB also provides level-3 clock.
Quidway® NetEngine 80 Core Router Switching Network Board
Copyright ©2007 Huawei Technologies Co., Ltd. All Rights Reserved.
http://www.huawei.com/products/datacomm/
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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.
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