Huawei S2720 Series Hardware Description page 57

S2720&S2750 Series Ethernet Switches
Hardware Description
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Table 4-1
Table 4-1 Optical module classification
Encapsul
ation
Type
SFP
eSFP
Issue 08 (2015-02-12)
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
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FE
GE
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Table 4-1 lists the physical layer standards.
Standard
100BASE-FX (IEEE
802.3u)
100BASE-LX (IEEE
802.3ah)
100BASE-BX (IEEE
802.3ah)
1000BASE-SX (IEEE
802.3z)
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.
Uses one Rx single-mode fiber and
one Tx single-mode fiber to transmit
data at 100 Mbit/s over a distance
within 80 km.
Uses one single-mode fiber for
bidirectional transmission at 100
Mbit/s over a distance within 15 km.
Uses one single-mode fiber for
bidirectional transmission at 1 Gbit/s
over a distance within 1 km.
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