Product Description further details
The Cisco IP Phone Power is used to supply power to the Cisco 7900 series IP phones. The is used to provide power to Cisco IP phones when in-line Power Over Ethernet is not available. This power adapter is commonly used to provide the Cisco 7960 power, the Cisco 7940 power, the Cisco 7914 power, the Cisco 7912 power, as well as power to the Cisco 7910, Cisco 7905 and the Cisco 7902. The Cisco power cube also supports the "G" versions of these models.
Detailed Compatible IP Phone Model Numbers:
CP-7914 (Keypad Expansion Module for 7960)