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Glossary

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Term Main definition
Twinaxial cable
A type of communications cable consisting of two center conductors surrounded by an insulating spacer, which is in turn surrounded by a tubular outer conductor (usually a braid, foil, or both). The entire assembly is then covered with an insulating and protective outer layer. Twinaxial is often thought of as dual-coaxial cable. Twinaxial cable was commonly used with Wang VS terminals, IBM 5250 terminals on System/3x, and AS/400 minicomputers. Also called twinax.
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Twisted pair
Two insulated copper wires twisted around each other to reduce induction (thus interference) from one wire to the other. The twists, or lays, are varied in length from pair to pair to reduce the potential for signal interference between pairs. Several sets of twisted-pair wires may be enclosed in a single cable. In cables greater than 25 pairs, the twisted pairs are grouped and bound together in groups of 25 pairs.
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Twisted-pair
Technology developed by the ANSI X3T9.5 working group that allows 100Mbps transmission over twistedpair cable.
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Type 1
150-ohm shielded twisted-pair (STP) cabling conforming to the IBM Cabling System specifications. Two twisted pairs of 22 AWG solid conductors for data communications are enclosed in a braided shield covered with a sheath. Type 1 cable has been tested for operation up to 16MHz. Available in plenum, nonplenum, riser, and outdoor versions.
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Type 1A
An enhanced version of IBM Type 1 cable rated for transmission frequencies up to 300MHz.
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Type 2
150 ohm shielded twisted-pair (STP) cabling conforming to the IBM Cabling System specifications. Type 2 cable is popular with those who insist on following the IBM Cabling System because there are two twisted pairs of 22 AWG solid conductors for data communications that are enclosed in a braided shield. In addition to the shielded pairs, there are four pairs of 22 AWG solid conductors for telephones that are included in the cable jacket but outside the braided shield. Tested for transmission frequencies up to 16MHz. Available in plenum and nonplenum versions.
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Type 2A
An enhanced version of IBM Type 2 cable rated for transmission speeds up to 300MHz.
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Type 3
100 ohm unshielded twisted-pair (UTP) cabling similar to ANSI/TIA/EIA 568-B Category 3 cabling. 22 AWG or 24 AWG conductors with a minimum of two twists per linear foot. Typically four twisted pairs enclosed within cable jacket.
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Type 31

Also known as BNC

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Type 5
100/140-micron optical fiber cable conforming to the IBM Cabling System specifications. Type 5 cable has two optical fibers that are surrounded by strength members and a polyurethane jacket. There is also an IBM Type 5J that is a 50/125-micron version defined for use in Japan.
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Type 6
150 ohm shielded twisted-pair (STP) cabling that conforms to the IBM Cabling System specifications. Two twisted pairs of 26 AWG stranded conductors for data communications. Flexible for use in making patch cables. Tested for operation up to 16MHz. Available in nonplenum version only.
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Type 6A
An enhanced version of IBM Type 6 cable rated for transmission speeds up to 300MHz.
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Type 8
150 ohm under-carpet cable conforming to the IBM Cabling System specifications. Two individually shielded parallel pairs of 26 AWG solid conductors for data communications. The cable includes
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Type 9
150 ohm shielded twisted-pair (STP) cabling that conforms to the IBM Cabling System specifications. A plenum-rated cable with two twisted pairs of 26 AWG solid or stranded conductors for data communications enclosed in a braided shield covered with a sheath. Tested for transmission speeds up to 16MHz.
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Type 9A
An enhanced version of IBM Type 9 cable rated for transmission speeds up to 300MHz.
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