T1
(1) A 1.544 megabit T-carrier channel that can
handle 24 voice or data channels at 64 Kbits/sec. The standard T1 frame is 193 bits long, which holds
24 8-bit voice samples and one synchronization bit. 8,000 frames are transmitted per
second.
T2
A 6.312 megabit T-carrier channel that can handle
96 voice or data channels at 64 Kbits/sec.
T3
A 44.736 megabit T-carrier channel that can handle
672 voice or data channels at 64 Kbits/sec. T3 requires fiber optic cable.
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