Huawei NetEngine40E Hardware Description

HUAWEI NetEngine40E Universal ServiceRouter
Hardware Description
4 NE40E-X3 Chassis Overview
Issue 01 (2012-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
100
4.3.5 Fan Speed Adjustment
When the system is fully configured, temperatures reported by the temperature sensors on the
LPUs and MPUs serve as the basis for fan speed adjustment. General principles are listed
below:
Ambient
Temperat
ure
Rotational
Speed
Noise and Dissipation Standards
-5°C-+27°
C ( 23°F -
80.6°F )
Low speed (45%
Pulse Width
Modulation
(PWM) and 55%
rotational speed)
When fans rotate at a constantly low speed, the noises
meet the ETSI standard and the fans meet heat
dissipation requirements of a fully configured system.
27°C-45°C
( 80.6°F
-113°F)
Linear variation
The fan speed is adjusted smoothly in linear mode,
without a sharp increase in noises.
Over 45°C
( 113°F )
High speed (100%
Pulse Width
Modulation
(PWM) and 100%
rotational speed)
Fans rotate at high speed to meet heat dissipation
requirements.
4.4 Control Plane
This chapter describes the control plane of the NE40E-X3.
4.4.1 Introduction to the Control Plane
The MPU of the NE40E-X3 controls and manages the system and switches data. The MPUs
work in 1+1 backup mode. The MPU consists of the main control unit,system clock unit,
synchronous clock unit, and system maintenance unit. The functions of the MPU are
described from the following aspects.
System Control and Management Unit
As the system control and management unit, the MPU provides the following functions on the
system control panel:

Route calculation: All routing protocol packets are sent by the forwarding engine to the
MPU for processing. In addition, the MPU broadcasts and filters packets, and downloads
routing policies from the policy server.

Outband communication between boards: The LAN switch modules integrated on the
MPU provide outband communications between boards. In this manner, communications
between MPUs and LPUs are controlled and maintained, and messages can be
exchanged.

Device management and maintenance: Devices can be managed and maintained through
the management interfaces (serial interfaces) provided by the MPU.

Huawei NetEngine40E Specifications

General

Brand	Huawei
Model	NetEngine40E
Category	Network Router
Language	English