Huawei S2700-EI Series Hardware Description page 53

S2700-EI Series Ethernet Switches
Hardware Description
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Table 4-1
Table 4-1 Optical module classification
Encapsul
ation
Type
SFP
Issue 07 (2014-10-25)
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: SFP, eSFP, SFP+,
XFP, and QSFP+.
– 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
rate. To reduce EMI, SFP+ optical modules have more springs than SFP optical modules
and the cages for SFP+ modules on a card are tighter.
– XFP: 10 Gigabit small form-factor pluggable. X is the Roman numeral 10, meaning
that all XFP optical modules provide a 10 Gbit/s transmission rate. XFP optical modules
support LC fiber connectors and are hot swappable. They are wider and longer than SFP
+ optical modules.
– QSFP+: quad small form-factor pluggable. QSFP+ optical modules support MPO fiber
connectors and are larger than SFP+ optical modules.
Classified by physical layer standards
Different physical layer standards are defined to allow data transmission in different modes.
Therefore, different types of optical modules are produced to comply with these standards.
The Standard column of
Classified by modes
Optical fibers are classified into single-mode and multimode fibers. Therefore, optical
modules are also classified into single-mode and multimode modules to support different
optical fibers.
– Single-mode optical modules are used with single-mode fibers. Single-mode fibers
support a wide band and large transmission capacity, and are used for long-distance
transmission.
– Multimode optical modules are used with multimode fibers. Multimode fibers have
lower transmission performance than single-mode fibers because of modal dispersion,
but their costs are also lower. They are used for small-capacity, short-distance
transmission.
provides optical module classification based on different factors.
Rate
FE
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Table 4-1 lists the physical layer standards.
Standard
100BASE-FX (IEEE
802.3u)
4 Pluggable Modules for Interfaces
Description
Uses one Rx multimode fiber and one
Tx multimode fiber to transmit data at
100 Mbit/s over a distance within 2
km.
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