Introduction to Data Communications
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45i. Token Ring Cabling

There are 2 basic types of Token Ring cabling:

Shielded Twisted Pair

STP or Shielded Twisted Pair is balanced shielded twisted pair cable, 150 +/-15 ohms impedance. It is used typically with the Hermaphroditic connectors. It is referred to as IBM Type 1, 1A, 2 or 6 cabling. It is the most expensive cabling to use. The cable is expensive and the connectors are expensive.


		Max Lobe Distance	# Stations per ring	Concentrator

4 Mbps		1000 ft/ 305 m	 		250		Passive

16 Mbps		550 ft/ 168 m			250		Passive

4/16 Mbps	1000 ft/ 305 m			250		Active

Unshielded Twisted Pair - Type 3

UTP or Unshielded Twisted Pair is used with phone style connectors: RJ11 or RJ45. It is 100 +/-15 ohms impedance typically 22 to 24 AWG wire. It is categorized into the following categories:


	Max Lobe Distance	# Stations per ring	Concentrator



4 Mbps		328 ft/ 100 m	 	72/54		Passive (old/new)

16 Mbps		328 ft/ 100 m		250		Passive

4 Mbps		328 ft/ 100 m		54		Active

16 Mbps		328 ft/ 100 m		250		Active

Introduction to Data Communications
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