HUAWEI NetEngine40E Universal ServiceRouter
Hardware Description
5 NE40E-8 Chassis Overview
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Part of the SFU
On the NE40E-8, the switching plane of the SRU exchanges data independently.
Each SRU is integrated with two SFUs. The integrated SFUs, together with another two SFUs,
operate in 3+1 backup mode. These four SFUs provide four switching planes and perform
load balancing.
System Clock Unit
The system clock unit of the SRU provides LPUs with reliable Synchronous Digital Hierarchy
(SDH) clock signals.
The SRU can provide the downstream devices with two-channel 2.048 MHz synchronous
clock signals, and can receive 2.048 MHz or 2.048 Mbit/s external reference clock signals.
In addition to the preceding functions, the SRU that supports the 1588v2 protocol can provide
Stratum-3 clock synchronization and 1588v2 clock synchronization through different
configurations on interfaces.
Synchronous Switching Clock Unit
The synchronous switching clock unit provides the SFUs with reliable synchronous clock
signals to maintain synchronization between the SFUs and the LPUs.
System Maintenance Unit
The SRU periodically collects the monitoring information of the system. The SRU can
implement local or remote test or in-service upgrade of system units through the JTAG bus.
The SRU periodically collects information about the operation of system units through the
MonitorBUS. It then generates such control information as in-position boards detection and
fan speed adjustment based on the running state.
Reliability
The main control modules, clock modules, and LAN switch modules on the SRU work in 1:1
hot backup mode, thus improving system reliability.
The two SRUs work in 1:1 backup mode. When the master SRU fails, the slave SRU takes
over as the master one.
5.5.3 Panel
Panel Appearance
Figure 5-18 shows the appearance of the SRU panel.
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