Avaya 5600 Series - Manual (Page 9)

Figure 3 Powering Option for 4620, 4620SW, 5620SW, 4621SW, 5621SW, 4622SW, 4625SW IP Telephones
Note:
These Telephone models are powered over network
cabling from a central location using an IEEE 802.3af compliant
switch or power supply as 1151C1/C2 Power Supply.
The use of PoE and local power simultaneously is not supported and
will prevent the adapter from working properly, nor is it intended to
serve as a fail-over option. The power cable must be removed from
the Gigabit adapter to allow for use of PoE.
Representative drawing - not to scale. Exact Jack
positions and orientations vary between specific models.
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