Here’s a great site to calculate power requirements: www.apcc.com/template/size/apc/index.cfm tools.apc.com also has some good tools to use.
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Power Consumption for Cisco and Avaya IP Phones
IEEE 802.3af Device – Class 0 (15.4W) IEEE 802.3af Device – Class 1 (4W) IEEE 802.3af Device – Class 2 (7W) IEEE 802.3af Device – Class 3 (15.4W) [heading]AVAYA:[/heading] [heading]CISCO:[/heading] What are the power requirements for the various models of the IP phone models? CP-7902G (6.3W) CP-7905G (6.3W) CP-7910-SW (6.3W) CP-7910G (6.3W) CP-7912G (6.3W) CP-7940G [...]