A customer plans to connect 40 Voice over IP (VoIP) phones and 8 security cameras to a switch:
The VoIP phones are Class 2 PoE devices and require a maximum of 45W (draw a maximum of
5w)
The security cameras are Class 4 PoE+ devices and require a maximum of 17W (draw a
maximum of 20 W)
The network architect is proposing an HP 5500-48G-PoE switch, which supports PoE and PoE+
and has a PoE power budget of 370W
The customer and architect agree on the class form of power allocation
What else does the solution require?
A.
A management module that is PoE+ capable
B.
A redundant power supply for the switch that enhances the PoE/PoE+ budget
C.
A power converter that enables the switch to provide PoE and PoE+ power at the same time
D.
A 208-220V input power service
B is correct
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Why B? for VoIP phones and cameras need about 360W (40*5W + 8*20W), but PoE power of switch is 370W
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Helena – There has to be a reserve of power to run the switch. With only 10w to spare the switch won’t start some of the ports because there is a reserve requirement. (I tried to find it for the listed switch, but with no luck). I verified this in the study guide, page 124.
B is correct.
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