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Type 3 Media Specifications:
Wire gauge: 22 or 24 AWG
Wire type: Solid copper, twisted pair
Minimum twists per foot: 2
Maximum dc resistance per 305 m (1000 ft): 28.4 ohms.
Characteristic Impedance at:
Maximum Attenuation at:
Additional Specifications:
Category 3
Data, up to 16 MHz.
This category applies to cables currently specified in ANSI/EIA/TIA 568. It is
intended for data transmission rates of up to 10Mbps.
Category 4
Data, up to 20 MHz.
This category is intended for data transmission rates of up to 16Mbps.
Category 5
Data, up to 100 MHz.
This category is intended for data transmission rates of up to 100Mbps. EIA/TIA
Category 5 media exceeds the requirements of EIA/TIA Category 4. You can use
the EIA/TIA Category 4 values for the maximum number of attaching devices and
the maximum lobe length Category 5 wiring.
In addition to operating at higher frequencies, Category 4 and 5 cable must meet
higher standards for mutual capacitance, attenuation, and near-end crosstalk than
EIA/TIA Category 3 does.
256 kHz
= 90.0-120.0 ohms
512 kHz
= 87.0-117.5 ohms
772 kHz
= 85.0-114.0 ohms
1 MHz
= 84.0-113.0 ohms
256 kHz
= 4.00 dB/305 m (1000 ft)
512 kHz
= 5.66 dB/305 m (1000 ft)
772 kHz
= 6.73 dB/305 m (1000 ft)
1 MHz
= 8.00 dB/305 m (1000 ft)
Cable must conform to one of the following
specifications:
- ICEA S-80-576
- REA PE-71
- Bell System TR-48007
Chapter 5. Planning for Twisted Pair Cable Connections
39
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