Audio And Video Problems; Phone Display Is Wavy - Cisco 7941G Troubleshooting And Maintenance
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Also See for 7941G:
- Administration manual (302 pages) ,
- User manual (132 pages) ,
- Phone manual (92 pages)
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Troubleshooting and Maintenance
802.1X Not Enabled
Problem
The phone does not have 802.1X configured.
Cause
These errors typically indicate that 802.1X is not enabled on the phone.
Solution
To enable it, see
Factory Reset of Phone has Deleted 802.1X Shared Secret
Problem
After a reset, the phone does not authenticate.
Cause
These errors typically indicate that the phone has completed a factory reset while 802.1X was enabled. A
factory reset deletes the shared secret, which is required for 802.1X authentication and network access.
Solution
To resolve this, you have two options:
• Temporarily disable 802.1X on the switch.
• Temporarily move the phone to a network environment that is not using 802.1X authentication.
After the phone starts up normally in one of these conditions, you can access the 802.1X configuration menus
and re-enter the shared secret.
Audio and Video Problems
The following sections describe how to resolve audio and video problems.
Phone Display Is Wavy
Problem
The display appears to have rolling lines or a wavy pattern.
Cause
The phone might be interacting with certain types of older fluorescent lights in the building.
• If the shared secret is not configured, enter it, and ensure that it matches the shared secret on the
authentication server.
Security Configuration Menu
for information on enabling 802.1X on the phone.
Troubleshooting and Maintenance
802.1X Not Enabled
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