Xtramus MCM-W V1.3 - Manual (Page 18)

2.1.2. 10GBASE-R (Optical Fiber)
10GBASE-R is 10Gbps Ethernet connection that based on IEEE802.3ae. It uses fiber as transmission
media with different specification of fiber, connector and transceiver. MCM-W uses two standards,
10GBASE-LR and 10GBASE-SR.
10GBASE-SR
10GBASE-SR ("Short Range") uses 64B/66B encoding and 850 nm wavelength lasers. It is designed to
support short distances over deployed multi-mode fiber cabling, it has a range of between 26 meters (85
ft) and 82 meters (270 ft) depending on cable type. It also supports 300 meters (980 ft) operation over
new, 50 µm 2000 MHz
⋅km OM3 multi-mode fiber (MMF).
The transmitter can be implemented with a VCSEL (Vertical Cavity Surface Emitting Laser) which is low
cost and low power. MMF has the advantage of having lower cost connectors than SMF (single-mode
fiber) due to its wider core.
10GBASE-SR delivers the lowest cost, lowest power and smallest form factor optical modules.
10GBASE-LR
10GBASE-LR ("Long Range") is a Long Range Optical technology delivering serialized 10 gigabit
Ethernet over a laser with 1310 nm wavelength connection on single-mode fiber via IEEE 802.3 Clause
49 64B-66B Physical Coding Sub layer (PCS) using a line rate of 10.3125.
Single-mode optical cabling is used to interconnect transceivers at a distance spaced at 10 kilometers
(6.2 mi), but it can often reach distances of up to 25 kilometers (16 mi) with no data loss.
Fabry–Pérot lasers are commonly used in 10GBASE-LR optical modules. Fabry–Pérot lasers are more
expensive than VCSELs (mentioned above) but their high power and focused beam allow efficient
coupling into the small core of single mode fiber.
Fiber Specification
Fibers which support many propagation paths or transverse modes are called multi-mode fibers (MMF).
Fibers which can only support a single mode are called single-mode fibers (SMF). Multi-mode fibers
generally have a larger core diameter, and are used for short-distance communication links and for
applications where high power must be transmitted. Single-mode fibers are used for most
communication links longer than 200 meters.
Fiber Buffer/Jacket Color Meaning
Yellow Single-mode optical fiber, long distance connection
Orange Multi-mode optical fiber, short distance connection
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