Understanding Optical Modules; What Is An Optical Module - Huawei S2720 Series Hardware Description

S2720&S2750 Series Ethernet Switches
Hardware Description
data reading, error tolerance, compatibility, electromagnetic compatibility (EMC), and
environmental parameters.
Non-Huawei-certified optical modules may cause the following problems:
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4.2 Understanding Optical Modules

4.2.1 What Is an Optical Module

On an optical network, a sender needs to convert electrical signals into optical signals before
sending them to a receiver, and the receiver needs to convert received optical signals into
electrical signals. An optical module is a component that completes electrical/optical conversion
on an optical network.
Issue 08 (2015-02-12)
Non-standard structure and size cause failures to install optical modules on adjacent optical
interfaces.
Structures or sizes of some non-Huawei-certified optical modules do not comply with the
Multi-Source Agreement (MSA). When such an optical module is installed on an optical
interface, the size of this optical module hinders optical module installation on adjacent
optical interfaces.
Data bus defects cause suspension of a switch's data bus.
Some non-Huawei-certified optical modules have defects in data bus designs. Using such
an optical module on a switch causes suspension of the connected data bus on the switch.
As a result, data on the suspended bus cannot be read.
Improper edge connector size damages electronic devices of optical interfaces.
If a non-Huawei-certified optical module with improper edge connector size is used on an
optical interface, electronic devices of the optical interface will be damaged by short
circuits.
Unnormalized temperature monitoring causes incorrect alarms.
The temperature monitoring systems of some non-Huawei-certified optical modules do not
comply with industry standards and report temperature values higher than the real
temperature. When such optical modules are used on a switch, the system will report
incorrect temperature alarms.
Improper register settings cause errors or failures in reading parameters or diagnostic
information.
Some non-Huawei-certified optical modules have improper register values on page A0,
which can cause errors or failures when the system attempts to read parameters or diagnostic
information from a data bus.
Some non-Huawei-certified optical modules are not designed in compliance with EMC
standards and have low anti-interference capability. Additionally, they bring
electromagnetic interference to nearby devices.
The operating temperature ranges of non-Huawei-certified optical modules cannot meet
service requirements. When they are used under relatively high temperature, the optical
power decreases, resulting in service interruption.
Figure 4-2
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shows the structure of an optical module.
4 Pluggable Modules for Interfaces
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