Huawei S6700 Series

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.
– QSFP+: quad small form-factor pluggable. QSFP+ optical modules support MPO fiber
connectors and are larger than SFP+ optical modules.
l 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 Table 7-1 lists the physical layer standards.
l 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.
Table 7-1 provides optical module classification based on different factors.
Table 7-1 Optical module classification
Encapsul
ation
Type
Rate Standard Description
eSFP GE 1000BASE-SX (IEEE
802.3z)
Uses one single-mode fiber for
bidirectional transmission at 1 Gbit/s
over a distance within 1 km.
1000base-LX/LH (IEEE
802.3ah)
Uses one Rx single-mode fiber and
one Tx single-mode fiber to transmit
data at 1 Gbit/s over a distance within
40 km.
1000base-ZX (IEEE
802.3)
Uses one Rx single-mode fiber and
one Tx single-mode fiber to transmit
data at 1 Gbit/s over a distance within
100 km.
1000base-BX (IEEE
802.3ah)
Uses one single-mode fiber for
bidirectional transmission at 1 Gbit/s
over a distance within 80 km.
CWDM (IEEE 802.3) Coarse wavelength division
multiplexing, which uses one single-
mode fiber to transmit signals on
multiple channels. It transmits data at
1 Gbit/s over a distance within 80 km.
S6700 Series Ethernet Switches
Hardware Description 7 Pluggable Modules for Interfaces
Issue 12 (2015-07-31) Huawei Proprietary and Confidential
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