Using External Devices - Cisco 7920 Regulatory Compliance And Safety Information Manual

Using External Devices

The following information applies when you use external devices with the
Cisco Unified Wireless IP Phone.
Cisco recommends the use of good quality external devices (such as 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.
Shorten the length of the external device cable.
•
Apply ferrites or other such devices on the cables for the external device.
•
Cisco cannot guarantee the performance of the system because Cisco has no
control over the quality of external devices, cables, and connectors. The
system will perform adequately when suitable devices are attached using
good quality cables and connectors.
Regulatory Compliance and Safety Information for Cisco Unified Wireless IP
Phone 7920 Series and Peripherals
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