A voice device in T1 CAS steals the eighth bit from the voice channel to transfer signaling information. Which frame sample is used in T1 channel DS0 to accomplish this action?

T1 Channel Associated Signaling (CAS) uses robbed-bit signaling where the least significant bit of each DS0 channel is overwritten with signaling state data (A and B bits) once every 6 frames within a 12-frame D4 superframe. The 6th frame is the defined interval at which bit robbing first occurs, making frame sample 6 the correct answer for identifying when this signaling action takes place.

Frame 5 is not the defined robbed-bit signaling frame - T1 CAS standards specify frame 6 (and frame 12 for the B bit in a D4 superframe) as the signaling frames.

Frame 1 is a normal data-carrying frame within the T1 superframe cycle and is not designated for robbed-bit signaling.

Frame 0 does not exist in the conventional 1-based indexing of T1 superframe structures, and robbed-bit signaling is defined at frame 6, not frame 0.