In Channel Associated Signaling on a T1 circuit using Extended Super Frame, how many signaling bits
does each T1 timeslot have?
A.
1
B.
2
C.
4
D.
12
E.
24
Explanation:
Each T1 channel carries a sequence of frames. These frames consist of 192 bits and an additional bit
designated as the framing bit, for a total of 193 bits per frame. Super Frame (SF) groups twelve of
these 193 bit frames together and designates the framing bits of the even numbered frames as
signaling bits. CAS looks specifically at every sixth frame for the timeslot’s or channel’s associated
signaling information. These bits are commonly referred to as A- and B-bits. Extended super frame
(ESF), due to grouping the frames in sets of twenty-four, has four signaling bits per channel or
timeslot. These occur in frames 6, 12, 18, and 24 and are called the A-, B-, C-, and D-bits respectively.
http://www.cisco.com/c/en/us/support/docs/voice/digital-cas/22444-t1-cas-ios.html