Glossary
74
TCP/IP PROTOCOLS—A set of protocols for intercomputer communication,
including network level (Internet Protocol), transport level (Transmission
Control Protocol or TCP) and application level protocols (for example, Telnet
terminal emulation). TCP/IP has been used for many years in two country-wide
networks, the ARPANET and MILNET. Recently, TCP/IP has become very
popular with users of a variety of multi-user computer systems and
engineering workstations. Most UNIX computers use TCP/IP over Ethernet as
the main intercomputer networking technology. TCP/IP is also popular among
PC users, particularly as a means of communication with large multi-user
computers.
TELCO CONNECTOR— A 50-pin receptacle that plugs into the front of the
hub, enabling cables from external devices to connect to the hub.
THICK ETHERNET—See 10BASE5
THIN ETHERNET—See 10BASE2
TRUNK CABLE—The coaxial cable used to distribute signals over long
distances throughout a cable system.
UNMANAGED MODULE— A repeater that behaves as a “dumb” repeater in
a department concentrator chassis (i.e., without a Master). It performs simple
repeating tasks like packet retiming and regeneration, but is not managed.
UNSHIELDED TWISTED PAIR (UTP)—A cable used in 10BASE-T wiring
that consists of at least two twisted pairs of 22 to 26 AWG wire. The pairs
should have at least 3 twists per foot and have an impedance of 100
Ω
. Level 3,
Level 4 and Level 5 UTP cables fit these criteria.
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