Cisco Cisco DWDM Transceiver Modules Libro blanco
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Figure 2. Unstructured Cabling
Types of Fiber Optic Fiber
As a result of the emergence of high-data-rate systems such as 10, 40, and 100 Gigabit Ethernet, laser-optimized
multimode fiber (MMF) has become the dominant fiber choice. These 50-micron fibers are optimized for the 850-
nanometer (nm) transmission of vertical-cavity surface-emitting laser (VCSEL)-based transceivers. The TIA-
492AAAC OM3 detailed fiber standard was released in March 2002, and the TIA-492AAAD OM4 detailed fiber
standard was released in August 2009. Corning Cable Systems suggests installing either OM3 or OM4 cabling in
the data center space depending on length requirements. The two fibers have different bandwidths (information
carrying capacity), which results in different achievable lengths for the same transceivers. Table 1 shows the
achievable distances based on the OM3 and OM4 fibers at various data rates. TIA 942-A Telecommunication
Infrastructure Standards for Data Centers recognizes only the OM3 and OM4 MMF types (it removed OM1, which
was 62.5 microns, and OM2, which was the standard 50 microns). The standard also provides guidance to
recommended OM4 cables using LC and MTP connectivity.
Table 1.
850-nm Ethernet Distance (m)
1-Gbps
1000BASE-SX
10-Gbps
10GBASE-SR
40-Gbps
40GBASE-SR-BD
40-Gbps
40GBASE-SR4
40-Gbps
40GBASE-cSR4
OM3
(50 microns)
(50 microns)
●
1000m
●
2 fibers
●
300m
●
2 fibers
●
100m
●
2 fibers
●
100m
●
8 fibers
●
300m
●
8 fibers
OM4
(50 microns)
(50 microns)
●
1000m
●
2 fibers
●
400m
●
2 fibers
●
125m
●
2 fibers
●
150m
●
8 fibers
●
400m
●
8 fibers
Types of Optical Transceiver Modules
The transceiver is an electronic device that receives an electrical signal, converts it into a light signal, and
launches the signal into a fiber. It also receives the light signal, from another transceiver, and converts it into an
electrical signal. For data rates greater than or equal to 1 Gbps, a multimode transceiver uses an 850-nm VCSEL
transceiver.