Cisco 9971 - Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager

Computer port (10/100/1000 PC) connection5DC adapter port (DC48V)1
Handset connection6AC-to-DC power supply (optional)2
Analog headset connection (headset optional)7AC power wall plug (optional)3
Anti-theft security lock connector (lock optional)8Network port (10/100/1000 SW) with IEEE
802.3af and 802.3at power enabled
4
The following diagram shows the phone from the side.
Cisco Unified IP Phone 8961, 9951, and 9971 Administration Guide for Cisco Unified Communications Manager 10.0
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Cisco Unified IP Phone 8961