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Using an External Power Supply
The following warnings apply when you use the external power supply with the
Cisco Unified 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.
Warning
The power supply must be placed indoors.
Caution Only use the Cisco specified power supply with this product.
Power Outage
Your accessibility to emergency service through the phone is dependent on the phone being powered.
If there is an interruption in the power supply, Service and Emergency Calling Service dialing will not
function until power is restored. In the case of a power failure or disruption, you may need to reset or
reconfigure equipment before using the Service or Emergency Calling Service dialing.
Using External Devices
The following information applies when you use external devices with the Cisco Unified IP Phone:
Cisco recommends the use of good quality external devices (speakers, microphones, and headsets) that
are shielded against unwanted radio frequency (RF) and audio frequency (AF) signals.
Depending on the quality of these devices and their proximity to other devices such as mobile phones
or two-way radios, some audio noise may still occur. In these cases, Cisco recommends that you take
one or more of the following actions:
• Move the external device away from the source of the RF or AF signals.
• Route the external device cables away from the source of the RF or AF signals.
• Use shielded cables for the external device, or use cables with a better shield and connector.