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Hardware
2.4 Cable Specifications
The following paragraphs list specifications for the different kinds of
cables which can be used with Andrew LAUs.
Category 5 Cable
This cable has been defined by the EIA/TIA as the cable of choice for
data applications up to 100 Mbps. See EIA/TIA specification #568 A/B
for building wiring recommendations.
•
UTP and STP available
•
22 and 24 gauge generally available
•
Impedance 100 ohms ± 15% from 512 kHz to 100 MHz
•
Maximum attenuation is 67.0 dB per 1,000 at 100 MHz.
Type 3 Cable (RJ45 Connector Modules)
The UTP Type 3 (levels 3 and 4) cable used with RJ45-equipped LAUs
should be standard twisted pair telephone building wire. Recommended
wire gauge is 24 or 22 AWG, Belden 9562 or equivalent. The following
requirements should be met:
•
Solid copper twisted pairs, with at least two twists per foot
•
A maximum DC resistance of 28.6 ohms per 1000 feet for level
3, and 27 ohms per 1000 feet for level 4
•
Characteristic impedance for level 3
— 90 to 120 ohms at 256 kHz
— 87 to 117.5 ohms at 512 kHz
— 85 to 114 ohms at 772 kHz
— 84 to 113 ohms at 1000 kHz
•
Characteristic impedance for level 4 is 100 ohms at 1 – 16 MHz
•
Maximum attenuation per 1000 feet for level 3
— 4.00 dB at 256 kHz
— 5.66 dB at 512 kHz
— 6.73 dB at 772 kHz
— 8.00 dB at 1000 kHz
10
Lobe Access Unit User's Guide
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