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Token Ring Network Requirements
IEEE 802.5j Single Mode Fiber Optics
Cable Type
IEEE 802.5j single mode fiber optic products for Token Ring networks require
specific types of cabling. Token Ring single mode fiber optic devices
manufactured by Cabletron Systems are able to support connections to and from
the following construction sizes of single mode fiber optics:
•
•
The use of other types of single mode fiber optic cabling, or any type of
multimode fiber optic cabling, may result in poor network performance or
inability to establish links.
Attenuation
Single mode fiber optic cables must be tested with an attenuation test set
configured for a 1,300 nm wavelength. The attenuation test will confirm or deny
that the cable falls within an acceptable level. All single mode fiber optic cables
that are allowable by the IEEE 802.5j specification must not exceed 15.1 dB of total
attenuation.
Link Length
The IEEE 802.5j specification sets the maximum length of a single mode fiber optic
station cable to 10 km (32,800 ft). The single mode fiber optic cable must meet all
other requirements of single mode fiber optic cables as detailed above.
Trunk Cable Length
The maximum length of a single mode fiber optic trunk cable is identical to the
maximum allotment for station connections using the same media.
10-10
8.3/125 m
12/140 m
IEEE 802.5j Single Mode Fiber Optics
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