Cisco ATA 191 Руководство пользователя - Страница 27

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Product Safety and Security

•

Your access to emergency service through the phone requires that the phone receive power. If a power

interruption occurs, service or emergency calling service dialing does not function until power is restored. If

a power failure or disruption occurs, you may need to reset or reconfigure the equipment before you can use

service or emergency calling service dialing.

We recommend that you use good-quality external devices that are shielded against unwanted radio frequency

(RF) and audio frequency (AF) signals. External devices include headsets, cables, and connectors.

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, we recommend that you take one or more

of these 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.

Safety and Performance Information, page 23

Compliance Statements, page 24

Cisco Product Security Overview, page 25

Important Online Information, page 25

C H A P T E R

Cisco ATA 191 User Guide for Cisco Unified Communications Manager