Figure 7-2 Structure of an optical module
1. Handle 2. Receiver 3. Transmitter
4. Shell 5. Label 6. Dust plug
7. Spring 8. Connector -
7.2.2 Types of Optical Modules
Optical modules are available in various types to meet diversified requirements.
l Classified by transmission rates
Depending on transmission rates, optical modules are classified into 40GE, 10GE and GE
optical modules.
l Classified by encapsulation types
The higher transmission rate an optical module provides, the more complex structure it has.
Optical modules are encapsulated in different modes to provide different structures. Huawei
switches support optical modules of the following encapsulation types: QSFP+, SFP, eSFP,
and SFP+.
– SFP: small form-factor pluggable. SFP optical modules support LC fiber connectors
and are hot swappable.
– eSFP: enhanced small form-factor pluggable. An eSFP module is an SFP module that
supports monitoring of voltage, temperature, bias current, transmit optical power, and
receive optical power. Therefore, eSFP is also called SFP sometimes.
– SFP+: small form-factor pluggable plus, SFP with a higher rate. SFP+ optical modules
are more sensitive to electromagnetic interference (EMI) because they have a higher
S6700 Series Ethernet Switches
Hardware Description
7 Pluggable Modules for Interfaces
Issue 12 (2015-07-31) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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