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Cisco Unified IP Video Phone 7985G Administration Guide
OL-8726-02
Chapter 9 Troubleshooting and Maintenance
General Troubleshooting Tips
Moving a network connection from
the phone to a workstation
If you are powering your phone through the network
connection, you must be careful if you decide to unplug the
phone’s network connection and plug the cable into a desktop
computer.
Caution
The computer network card cannot receive power
through the network connection; if power comes
through the connection, it can destroy the network
card. To protect a network card, wait 10 seconds or
longer after unplugging the cable from the phone
before plugging it into a computer. This delay gives
the switch enough time to recognize a phone is no
longer on the line and to stop providing power to the
cable.
Changing the telephone
configuration
By default, the system locks the network configuration options
to prevent users from making changes that could impact their
network connectivity. You must unlock the network
configuration options before you can configure them. See the
“Unlocking and Locking Options” section on page 4-3
for
details.
Phone resetting
The phone resets when it loses contact with the Cisco
Unified CallManager software. Any network connectivity
disruption including cable breaks, switch outages, and switch
reboots can cause this lost connection.
LCD display issues
If the display appears to have rolling lines or a wavy pattern, it
may be interacting with certain types of older fluorescent lights
in the building. Moving the phone away from the lights, or
replacing the lights, should resolve the problem.
Dual-Tone Multifrequency (DTMF)
delay
When you are on a call that requires keypad input, if you press
the keys too quickly, the system may not recognize some of
them.
Table 9-1
Cisco Unified IP VIdeo Phone Troubleshooting (continued)
Summary
Explanation
Содержание 7985G - IP Phone NTSC Video
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