Glossary
Term | Main definition |
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Thermoplastic |
A material that will soften, flow, or distort appreciably
when subjected to sufficient heat and pressure. Examples
are polyvinyl chloride and polyethylene, which are commonly
used in telecommunications cable jackets.
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Thicknet |
Denotes a coaxial cable type (similar to RG-8) that is
commonly used with Ethernet (10Base-5) backbones.
Originally, thicknet cabling was the only cabling type
used with Ethernet, but it was replaced as backbone
cabling by optical fiber cabling. Thicknet cable has an
impedance of 50 ohms and is commonly about 0.4 inches
in diameter.
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Thinnet |
Denotes a coaxial cable type (RG-58) that was commonly
used with Ethernet (10Base-2) local area networks.
This coaxial cable has an impedance of 50 ohms and is
0.2 inches in diameter. It is also called cheapernet due to
the fact that it was cheaper to purchase and install than
the bulkier (and larger) thicknet Ethernet cabling. The
maximum distance for a thinnet segment is 180 meters.
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TIA Telecommunications Industry Association | The standards body that helped to author the ANSI/TIA/EIA-568-B Commercial Building Telecommunications Cabling Standard in conjunction with EIA and that continues to update it, along with standards for pathways, spaces, grounding, bonding, administration, field testing, and other aspects of the telecommunications industry. See Chapter 2 for more information.
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Tight buffer |
A type of optical fiber cable construction where each
glass fiber is buffered tightly by a protective thermoplastic
coating to a diameter of 900 microns. High tensile
strength rating is achieved, providing durability and
ease of handling and connectorization.
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Tight-buffered |
An optical fiber with a buffer that matches the outside
diameter of the optical fiber, forming a tight outer protective
layer; typically 900 microns in diameter.
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Timing circuit |
In an optical time-domain reflectometer, the circuit used
to coordinate and regulate the testing process.
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Tinsel |
A type of electrical conductor composed of a number
of tiny threads, each having a fine, flat ribbon of copper
or other metal closely spiraled about it. Used for smallsized
cables requiring limpness and extra-long flex life.
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Tip |
(1) A polarity designation of one wire of a pair indicating
that the wire is that of the primary (common) color of a
five-pair cable (which is not commonly used anymore)
group (e.g., the white/blue wire of the blue pair). (2) A
wiring contact to which the tip wire is connected. (3) The
positive wiring polarity. See also ring.
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Tip conductor |
A telephony term used to describe the conductor of a
pair that is grounded at the central office when the line is
idle. This term was originally coined from its position as
the first (tip) conductor of a tip-ring-sleeve switchboard
plug. See also tip.
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TMA | Tower Mounted Amplifier – generically referred to as an MHA TMA-D: Duplexed Tower Mount Amplifier that combines Tx and Rx ports from the radio system and connects to a single antenna.
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TNC |
A threaded connector used to terminate coaxial cables.
TNC is an acronym for Threaded Neill-Concelman (Neill
and Concelman invented the connector).
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Token passing |
A media access method in which a token (data packet) is
passed around the ring in an orderly fashion from one
device to the next. A station can transmit only when it
has the token. The token continues around the network
until the original sender receives the token again. If the
host has more data to send, the process repeats. If not,
the original sender modifies the token to indicate that
the token is free for anyone else to use.
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Token Ring |
A ring topology for a local area network (LAN) in which
a supervisory frame, or token, must be received by an
attached terminal or workstation before that terminal or
workstation can start transmitting. The workstation with
the token then transmits and uses the entire bandwidth
of whatever communications media the token ring network
is using. The most common wiring scheme is called
a star-wired ring. Only one data packet can be passed
along the ring at a time. If the data packet goes around
the ring without being claimed, it eventually makes its
way back to the sender. The IEEE standard for Token
Ring is 802.5.
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Tone dial | A push-button telephone dial that makes a different sound (in fact, a combination of two tones) for each number pushed. The technically correct name for tone dial is dual-tone multifrequency (DTMF) since there are two tones generated for each button pressed.
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