Cisco WS-C2960-24TC-S-RF Software Guide - Page 433
Wall-Powered Phones, Powering Off the Phone, Phone Removal, Device, Required Power W
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Chapter 28 Power Management Understanding How Inline Power Works Table 28-4 Power Requirements for Some Powered Devices Device Cisco legacy IP phone Cisco + IEEE IP phone Cisco high-power powered device Cisco Aironet 1200 Access Point with 802.11a and 802.11b radio installed Required Power (W) 6.3 7 15.4 11 Wall-Powered Phones When a wall-powered phone is present on a switching module port, the switching module cannot detect its presence. The supervisor engine discovers the phone through CDP messaging with the port. If the phone supports inline power (the supervisor engine determines this through CDP), and the mode is set to Auto, Static, or Off, the supervisor engine does not attempt to power on the port. If a power outage occurs, and the mode is set to Auto, the phone loses power, but the switching module discovers the phone and informs the supervisor engine, which then applies inline power to the phone. If a power outage occurs, and the mode is set to Static, the phone loses power, but the switching module discovers the phone and applies the preallocated inline power to the phone. Powering Off the Phone The supervisor engine can turn off power to a specific port by sending a message to the switching module. The power for a port in Auto mode is then added back to the available system power. Power for ports in Static mode is not added back to the available system power. This situation occurs only when you power off the phone through the CLI or SNMP. Phone Removal The switching module informs the supervisor engine if a powered phone is removed using a link-down message. The supervisor engine then adds the allocated power for that port back to the available inline power if the port is in Auto mode. In addition, the switching module informs the supervisor engine if an unpowered phone is removed. Caution When you plug a Cisco IP phone into a port and turn the power on, the supervisor engine waits 4 seconds for the link to go up on the line. During this time, if you unplug the phone cable and plug in a network device, you could damage the device. We recommend that you wait at least 10 seconds between unplugging a device and plugging in a new device. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 28-13
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