Implementing Cisco Collaboration Devices (CICD, legacy) — Question 80

Which signaling method uses robbed bit signaling?

Answer options

• A. CAS
• B. FXS
• C. FXO
• D. CCS A

Correct answer:

Explanation

The correct answer is A. CAS, which utilizes robbed bit signaling to convey both voice and signaling information over the same circuit. In contrast, FXS and FXO refer to the interface types for telephone devices and do not involve signaling methods, while CCS A is a different signaling system that does not use robbed bit signaling.