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Greg,Below Is the link to the doc which specifies that 3550 does not support 802.3af.http://topic.cisco.com/vivisimo/cgi-bin/query-meta?sa=Search&v:sources=CARE&v:sources=DDTS&q=http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps646/prod_qa...
