How many full duplex timeslots does a T1 line contain?

The correct answer is B. 24. A T1 line contains 24 full-duplex timeslots (DS0 channels), each operating at 64 Kbps, for a total bandwidth of 1.544 Mbps. The 30-timeslot figure (option A) applies to an E1 line, which has 30 usable bearer channels plus 2 channels for framing and signaling. The 23-timeslot…

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(15 responses)

B
93% (14)
C
7% (1)

Explanation

A T1 line contains 24 full-duplex timeslots (DS0 channels), each operating at 64 Kbps, for a total bandwidth of 1.544 Mbps. The 30-timeslot figure (option A) applies to an E1 line, which has 30 usable bearer channels plus 2 channels for framing and signaling. The 23-timeslot figure (option C) refers to the number of usable bearer (B) channels in a T1 PRI circuit, where one timeslot is reserved as the D channel for signaling. Option D (31) refers to the total timeslots in an E1 including the D channel and framing channel.

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#T1#timeslots#digital trunks

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