Max number of IP phones per blade

I have read in aCisco manual that the maximum number of IP phones is 18, assuming they use 15,4Watt. On a WS-X4148-RJ45V combined with a PWR-C45-4200ACV that leaves us with 30 ports we can not use for VoIP useing PoE. Or am I wrong?

this is not correct.
every port in the blade can be used for ip phones.
maximum wattage for the WS-X4148-RJ45V is 7 watts per port.
power allocation from an 4148-RJ45V for a cisco ip phone is 6.3 watts. (6.3 x 48= 302.4 watts)
with 2 supII+ & 5 4148-RJ45Vs in a 4507, ~635 watts are used for the blades.
with a 2800watt PS, this provides for 1400 watts for voice power. this allows for upto 222 out of 240 ports that can receive voice power.

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