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Cisco Unified IP Phone 7960G/7940G Administration Guide for Cisco Unified Communications Manager 7.0 (SCCP)
OL-15498-01
Chapter 8 Troubleshooting and Maintenance
General Troubleshooting Tips for the Cisco Unified IP Phone Expansion Module 7914
General Troubleshooting Tips for the Cisco Unified IP Phone
Expansion Module 7914
Table 8-3 provides general troubleshooting information for the Cisco Unified IP Phone Expansion
Module 7914.
Ta b l e 8-3 Cisco Unified IP Phone Expansion Module 7914 Troubleshooting
Problem Solution
No display on the Cisco Unified IP Phone
Expansion Module 7914
Verify that all of the cable connections are correct.
Verify that you have power to the Cisco Unified IP Phone Expansion
Module 7914.
Lighted buttons on the first Cisco
Unified
IP Phone Expansion Module 7914 are all
red.
Verify that the Cisco Unified IP Phone Expansion Module 7914 is
defined in Cisco Unified
Communications Manager.
Lighted buttons on the second Cisco
Unified
IP Phone Expansion Module 7914 are all
amber.
Verify that the Cisco Unified IP Phone Expansion Module 7914 is
defined in Cisco Unified
Communications Manager.
Loopback condition. A loopback condition can occur when the following conditions are met:
• The SW Port Configuration option in the Network Configuration menu on the
phone is set to 10H
(10-BaseT / half duplex)
• The phone receives power from an external power supply.
• The phone is powered down (the power supply is disconnected).
In this case, the switch port on the phone can become disabled and the following
message will appear in the switch console log:
HALF_DUX_COLLISION_EXCEED_THRESHOLD
To resolve this problem, re-enable the port from the switch.
Table 8-2 Cisco Unified IP Phone Troubleshooting (continued)
Summary Explanation