ADTRAN ISU 128 User Manual
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Glossary
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T1C
3.152 Mbps. Capable of handling 48 voice conversations. T1C is further up the North
American digital carrier hierarchy.
T2
6.312 Mbps. Capable of handling 96 voice conversations. T2 is four times the capacity
of T1.
T3
44.736 Mbps. Commonly referred to as 45 Mbps. Capable of handling 672 voice
conversations. T3 runs on fiber optic and is typically called FT3.
TA
Terminal Adaptor. A DCE that connects to the ISDN S-Interface and enables
non-ISDN terminal equipment to communicate over the ISDN.
TE1
Terminal Equipment Type 1. ISDN-compatible terminals.
TE2
Terminal Equipment Type 2. Non-ISDN terminal equipment linked at the EIS-232,
RS-449, or V.35 interfaces.
tandem
The connection of networks or circuits in series. The connection of the output of one
circuit to the input of another.
T-interface
T-Reference point. Performs the same function as the S-Interface but uses an NT1,
rather than an NT2.
twisted pair
Two wires twisted around each other to reduce induction (interference) from one wire
to the other. Several sets of twisted pair wires may be enclosed in a single cable.
Twisted pair is the normal cabling from a central office to your home or office, or from
your PBX to your office phone. Twisted pair wiring comes in various thicknesses.
As a general rule, the thicker the cable is, the better the quality of the conversation and
the longer cable can be and still get acceptable conversation quality. However, the
thicker it is, the more it costs.