I use the Avaya 1115B1 Power supplies for IP Phones just plug into same outlet or source as S8300 and wire output
from power supply / pins 7 / 8 ( brown pair ) to the
Emergency Transfer units power input I have done it for
S8500 sites as well unlike the older PBX which supplies
it off the Aux card.
make an Rj45 clip as you normally would and connect to
"output" from Ext Power Supply and cut down on a punch down block then crosswire the brn pair -48 /grd to your Amp tail for the power transfer unit.
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