Getting Started
Cisco IP Phone 7905G and 7912G for Cisco CallManager
3
Using an External Power Supply
The following warnings apply when you use the external power supply with the Cisco IP Phone:
Warning
This product relies on the building's installation for short-circuit (over current)
protection. Ensure that a fuse or circuit breaker no larger than 120 VAC, 15A U.S. (240 VAC,
10A international) is used on the phase conductors (all current-carrying conductors).
Warning
The device is designed to work with TN power systems.
Warning
The plug-socket combination must be accessible at all times because it serves as the
main disconnecting device.
Caution
Use only a Cisco-approved power supply.
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