- T1
- A digital transmission standard providing 1.544M Bits/second. This is usually carved up
into 24 time slots each of which is 8 bits sampled at 8KHz, that's 24 64kbit channels.
Multiple
channels can be combined to provide greater capacity, for example six channels are
combined to provide 15KHz program service. Each T1 can provide a variety of services as
long as all the usages add up to no more than 24 time slots. T1s are always bidirectional.
You may come accross a T1 under a different name as the delivery vehicle for an ISDN PRI.
- Telco
- Any company that provides dial-up, on-demand voice and/or data transmission services.
- Telco Test Level
- A transmitted level into a telco circuit of zero dBm, or one
milliwatt into 600 ohms. For telco and most broadcasters, is 8 dB below Program Operating Level or 8 dB below Plant Level. Represented on a
VU meter by a reading of -8 VU.
- Terminal Adapter
- The device that connects an audio codec to an ISDN circuit. Enables you to dial a distant connection and
translates the data from the audio codec to the switched network.
- Terminating
- The opposite of Bridging. Describes a device which
correctly loads a circuit to which it is connected. Such a device does affect the level in
the circuit when it is connected and disconnected.
- Three Point
- A makeshift office monitoring system which allows anyone with a monitoring station to
hear one of three audio sources in mono. Though no longer in use in Washington, a variant
of this system still survives in the Bureaus and re-appears every four years in the
political conventions.
- Toll Test Board
- See Program Operating Center.
- TOC
- Transmission Operating Center The television equivalent of a Program Operating Center. "Program" refers to audio only.
In a TOC, the audio and video for the TV networks travel through the same wires,
amplifiers and carriers as each other because the audio is diplexed on a subcarrier of the
video carrier.
- TT#
- Trouble Ticket Number Number assigned to a specific trouble in a Common Carrier service which should be kept for future
reference. May be any length from 1 to 10 characters and any combination of letters and
digits. Still relevant to this very day. The rule is, if its broke, get a Trouble Ticket
Number.
- TOM
- Technical Operations Manager The technical supervisor at any given
moment at BBC Bush House in
London. The person you talk to on the phone is usually the the ATOM (that's Assistant
TOM).
- Tone Control
- A series of tones generated by the control unit used to control the base station. Should
not be confused with PL.
- Transceiver
- A transmitter and receiver that are packaged as one unit. Handitalkies
and base stations are both examples of transceivers.
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