Fiber Optic Requirements - Cabletron Systems E2210 Installation Manual

TECHNICAL SPECIFICATIONS
A.1.5 Fiber Optic Requirements
Cable
The fiber optic link segments should consist of either 50/125
micrometer, 62.5/125 micrometer, or 100/140 micrometer fiber
optic cabling.
Attenuation
Cable must be tested with a fiber optic attenuation test set
adjusted for 850 nanometer wavelength. This test verifies that
the signal loss in the cable is acceptable. Attenuation limits for
various cable types are listed below:
-3.0 dB or less for a 50/125 micrometer fiber cable segment
-16.0 dB or less for a 62.5/125 micrometer fiber cable segment
-19.0 dB or less for a 100/140 micrometer fiber cable segment
Fiber Optic Budget
The fiber optic budget and total network propagation delay
should be calculated before fiber runs are incorporated in any
network design.
Fiber optic budget is the combination of optical loss of the fiber
optic cable, in-line splices, and fiber optic connectors.
Propagation delay is the time it takes a packet to travel from
the sending device to the receiving device.
Length
The maximum fiber optic cable length is 2Km (6558 feet), if
system budgets are met. However, IEEE 802.3 FOIRL (Fiber
Optic Inter-Repeater Link) specifications specify a maximum of
1 Km (3279 feet).
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