How many signaling bits are there in each T1 time slot using channel associated signaling with Super
Frame?
A.
1
B.
2
C.
4
D.
8
E.
12
Explanation:
Each T1 CAS has 24 channels that can transmit 8 bits per channel each. This gives us
a total of 192 bits. The T1 has one additional bit for framing, bringing the total to 193 bits. Two types
of line coding can be used on a T1 CAS. The first type of line coding is called Super Frame (SF). This is
an older and less – efficient type of framing. Super Frame bundles 12 of these 193 – bit frames
together for transport. It then uses the even – numbered frames as signaling bits. The T1 CAS
signaling then looks at every sixth frame for signaling information. This comes out to be 2 bits that
are referred to as the A and B bits, which reside in frames 6 and 12.