What is STP cabling?
Shielded Twisted Pair (STP) is the 150 ohm twisted pair cabling defined by the IBM Cabling System Specifications for use with Token-Ring networks. The twisted pairs in 150ohm STP are individually wrapped in a foil shield and enclosed in an overall outer braided wire shield. This shielding is designed to minimize EMI radiation and susceptibility to crosstalk. The various versions of 150 ohm cable are identified by a IBM “Type” number; Types, 1, 2, 6,8, and 9 for support of Token-Ring frequencies up to 16Mhz and Types 1A, 2A, 6A, and 9A for support of FDDI frequencies up to 100 Mhz.
