TOUCH-TONE ADAPTOR (TT)
A device that can be connected to a rotary dial telephone to allow for DTMF signaling.

TRAFFIC
Calls being sent and received over a communications network.

TRAFFIC MEASUREMENT AND RECORDING SYSTEMS (TMRS)
A computer generated report showing usage information of telephone systems. Usually this includes trunk utilization,
outages, queueing time, and the need for additional common equipment.

TRAFFIC SERVICE POSITION SYSTEM (TSPS)
A toll switchboard position configured as a push button console.

TRANSMISSION (XMISSION) (XMIT)
The electrical transfer of a signal, message or other form of data from one location to another without unacceptable loss of information content due to attenuation, distortion, or noise.

TRANSMISSION LEVEL (TL)
The level of power of a signal, normally 1,000 Hz, which should be measured at a particular reference point.

TRANSMISSION SPEED (TS) (WPM) (BAUD) (BPS)
Number of pulses or bits transmitted in a given period of time, usually expressed as Bits Per Second (BPS) or Words Per Minute (WPM).

TRUNK
A telephone circuit or path between two switches, at least one of which is usually a telephone company Central Office or switching center. Regular local CO circuits are called PBX trunks, because there is a switch at both ends of the circuit.

TRUNK GROUP (TG)
An arrangement of communications channels into an identical group.

TRUNK TYPE (TT)
Trunks that use the same type of equipment going to the same terminating location.