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Cisco Unified IP Phone Administration Guide for Cisco Unified CallManager 4.2, Cisco Unified IP Phones
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Chapter 2 Preparing to Install the Cisco Unified IP Phone on Your Network
Understanding the Phone Startup Process
This module sends power on pins 1 & 2 and 3 & 6, which are also used to
transmit Ethernet signals. Before the switch sends power, it tests for the
presence of a Cisco Unified IP Phone, avoiding damage to other Ethernet
devices.
Note Only the network port supports inline power from the
Cisco Catalyst switches.
• WS-PWR-PANEL—Power patch panel that allows the
Cisco Unified IP Phone to be connected to existing Catalyst 4000, 5000, and
6000 family 10/100BaseTX switching modules.
This module sends power on pins 4, 5, 7, & 8, which are not used for Ethernet
signaling. Like the inline power, the power patch panel also attempts to verify
that the attached device is a Cisco Unified IP Phone before providing power.
Related Topics
• Power Outage, page 2-5
• Understanding Interactions with Other Cisco Unified IP Telephony Products,
page 2-2
• Installing the Cisco Unified IP Phone, page 3-8
Power Outage
Your accessibility to emergency service through the phone is dependent on the
phone being powered. If there is an interruption in the power supply, Service and
Emergency Calling Service dialing will not function until power is restored. In the
case of a power failure or disruption, you may need to reset or reconfigure
equipment before using the Service or Emergency Calling Service dialing.
Related Topics
• Understanding Interactions with Other Cisco Unified IP Telephony Products,
page 2-2
• Providing Power to the Cisco Unified IP Phone, page 2-4
• Installing the Cisco Unified IP Phone, page 3-8
