Glossary
Term | Main definition |
---|---|
Twin lead |
A transmission line used for television receiving antennas
having two parallel conductors separated by insulating
material. Line impedance is determined by the
diameter and spacing of the conductors and the insulating
material. The conductors are usually 300 ohms.
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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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