Cisco CP-7911G Administration Guide - Page 237

Chapter 9 Troubleshooting and Maintenance General Troubleshooting Tips OL11954-01 Table 9-2 Cisco Unified IP Phone Troubleshooting (continued) Summary Explanation 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. Changing the telephone configuration. Phone resetting. Caution The computer's network card cannot receive power through the network connection; if power comes through the connection, the network card can be destroyed. 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 that there is no longer a phone on the line and to stop providing power to the cable. By default, the network configuration options are locked 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 4-4 for details. The phone resets when it loses contact with the Cisco Unified Communications Manager software. This lost connection can be due to any network connectivity disruption, including cable breaks, switch outages, and switch reboots. Cisco Unified IP Phone 7906G and 7911G for Cisco Unified Communications Manager 6.0 9-17