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Cable Lengths
Category 5 distributed cable that meets ANSI/EIA/TIA-568-A building wiring standards can be a
maximum of 328 feet (100 m) in length, divided as follows:
•
20 feet (6 m) between the hub and the patch panel (if used)
•
295 feet (90 m) from the wiring closet to the wall outlet
•
10 feet (3 m) from the wall outlet to the desktop device
The patch panel and other connecting hardware must meet the requirements for 100 Mbps
operation (Category 5). Workmanship quality is a must. Only 0.5 inch (1.5 cm) of untwist in the
wire pair is allowed at any termination point.
Cable Specifications
Table C-1 lists the electrical requirements of the Category 5 cable.
Table C-1.
Electrical requirements of Category 5 cable
Specification
Number of pairs
Impedance
Mutual capacitance at 1 KHz
Maximum attenuation
(dB per 100 m, at 20 C)
NEXT loss (dB minimum)
Fast Ethernet and Cabling Guidelines
Installation Guide for the Model FE104 and Model FE108 Fast Ethernet Hubs
Requirements
Two or Four
100
5.6 nF per 100 m
at 16 MHz: 8.2
at 31 MHz: 11.7
at 100 MHz: 22
at 16 MHz: 44
at 31 MHz: 39
at 100 MHz: 32
15%
C-3
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