Which issue does CAS signaling on a T1 circuit create?
A.
Signaling bits are subtracted from each frame, which causes a significant loss of voice quality.
B.
An extra signaling bit is added to the sixth frame to carry signaling information.
C.
A signaling bit is subtracted from every sixth frame to carry signaling information.
D.
Signaling bits are added to the signaling stream to create extended super frames.
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
Link:
http://www.cisco.com/en/US/tech/tk652/tk653/technologies_tech_note09186a00800e2560.shtml