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Extra info for IP Telephony Network Design Guide
Cisco IP Telephony Network Design Guide 2-22 78-11103-03 Chapter 2 Campus Infrastructure Considerations IP Addressing and Management Power Requirement Field When the switch provides inline power to an IP phone, it has no way of knowing how much power the phone needs (this varies by model). Initially, the switch allocates 10W, then adjusts the delivered power according to the requirements sent by the IP phone in the CDP message. Auxiliary VLANs and Data VLANs The new voice VLAN is called an auxiliary VLAN in the Catalyst software command-line interface (CLI).
For native Cisco IOS commands, refer to the specific product documentation for the switches and line cards. Configuring the Default Power Allocation You can configure the default power allocation using the following command: set inlinepower defaultallocation value This command specifies how much power, in watts, to apply on a per-port basis. The default value of 10W is good for any currently available or planned Cisco IP Phone model. The phone has the intelligence to report to the switch how much power it actually needs (using Cisco Discovery Protocol), and the switch can adjust the delivered power accordingly, but under some circumstances you might want to reconfigure the default allocation.
This behavior is exhibited only by Cisco IP Phones, so that other devices connected to the switch port are safe from receiving current. This hardware polling is done by the system at fixed intervals on a port-by-port basis until a LINK signal is seen or the system has been configured not to apply inline power to that port. 2. When the switch finds an IP phone by using phone discovery, it applies power to the device. The Cisco IP Phone powers up, energizing the relay and removing the loopback (normally closed relay becomes open) between transmit and receive pairs.