Implementing Cisco Collaboration Devices (CICD, legacy) — Question 16

Which port is configured for connection to the PSTN?

Answer options

• A. T1
• B. FAS
• C. FXS
• D. FXO

Correct answer: D

Explanation

The FXO port is specifically designed to connect to the PSTN, allowing for the integration of traditional telephone lines into VoIP systems. In contrast, FXS ports are used to connect directly to phones or fax machines, T1 is a type of digital transmission link, and FAS relates to a signaling protocol, making them unsuitable for PSTN connections.