Cisco 7912G Administration Guide - Page 44
Understanding the Phone Startup Process, Obtaining Power from the Switch
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Understanding the Phone Startup Process Chapter 2 Preparing to Install the Cisco IP Phone on Your Network Understanding the Phone Startup Process When connecting to the VoIP network, the Cisco IP Phone goes through a standard startup process composed of up to seven steps. Depending on your specific network configuration, not all of these steps may occur on your Cisco IP Phone. Each of these steps is described in the sections that follow: • Obtaining Power from the Switch, page 2-4 • Loading the Stored Phone Image, page 2-5 • Configuring VLAN, page 2-5 • Obtaining an IP Address, page 2-5 • Accessing TFTP Server, page 2-6 • Requesting Configuration Files, page 2-6 • Contacting Cisco CallManager, page 2-7 Related Topics • Verifying the Phone Startup Process, page 3-9 • Resolving Startup Problems, page 6-12 Obtaining Power from the Switch You can connect the Cisco IP Phone to a Cisco Catalyst switch with one of the modules that provides power to the phone (WS-X6348-RJ45V). See the "Providing Power to the Cisco IP Phone" section on page 2-9 for details. If you use this optional configuration, the phone receives phantom power and powers up when you connect the Cisco IP Phone to the switch. The phone then sends Cisco Discovery Protocol (CDP) notifications to the switch indicating it is ready to receive CDP packets and indicating the power requirement for the phone. The switch allocates power and sends it over the network cable. Cisco IP Phone Administration Guide for Cisco CallManager 3.3, Cisco IP Phones 7902G/7905G/7912G 2-4 OL-6313-01