Cabletron Systems STHI Unshielded Twisted Pair UTP, Operating Electrical Signal, Per 100m @ ≥100m

Unshielded Twisted Pair (UTP)

Table B-1. UTP Cable Category Specifications

UTP	Operating	Electrical		Signal	NEXT
			Attenuation		loss
Cat.	Frequency	Impedance
			per 100m		(@ ≥100m)
3	4 MHz	≤ 100Ω ±15%	≤	5.6 dB	≥ 32 dB
	16 MHz	≤ 100Ω ±15%	≤ 13.1 dB		≥ 23 dB*
4	4 MHz	≤ 100Ω ±15%	≤	4.3 dB	≥ 47 dB
	16 MHz	≤ 100Ω ±15%	≤	8.9 dB	≥ 38 dB
5	4 MHz	≤ 100Ω ±15%	≤	4.3 dB	≥ 63 dB
	16 MHz	≤ 100Ω ±15%	≤	8.2 dB	≥ 44 dB

*below Token Ring performance requirement of ≥ 30.5 dB.

Categories 4 and 5 are higher quality versions of category 3. They use the same gauge of wire but demonstrate superior performance due to improvements in material quality and assembly (e.g. more twists per foot).

WARNING

WARNING

Because Near-End Crosstalk (NEXT) contributes the majority of its detrimental effects near the end of a lobe cable, the quality of jumper cables and patch cables is critical. Seek the highest practical grade. The quality of connectors and terminators is also critical.

DO NOT connect UTP cabling to any non-Token Ring network conductors (telephone, etc.) or ground. If in doubt, test wiring before using. Telephone Battery and Ringing voltages used in UTP telephone circuits may present a shock hazard and may damage Token Ring equipment when connected to Token Ring cabling.

B.1.2 UTP Lobe Lengths

The physical length of the cable connecting a station to a TCU port on the STHI is referred to as the lobe length. The maximum lobe length attainable under ideal conditions, is shown in Table B-2. Cable routing, connector attenuation, noise, and crosstalk can adversely affect the maximum lobe length.

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