User's Manual

81
Regulatory Compliance and Safety Information
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:
• Mo
ve the external device away from the source of the RF or AF signals.
• R
oute the external device cables away from the source of the RF or AF
signals.
• U
se shielded cables for the external device, or use cables with a better
shield and connector.
• Shorten the length of the external device cable.
• A
pply ferrites or other such devices on the cables for the external device.
Cisco cannot guarantee the performance of the system because Cisco has no
co
ntrol 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.