Powercom 625A - Manual (Page 9)

4.5 Connect the loads
Plug the loads into the output connectors on the rear of the UPS. To use the
UPS as a master on/off switch, make sure all of the loads are switched on.
Caution: Never connect a laser printer or plotter to the UPS with other
computer equipment. A laser printer or plotter periodically draws
significantly more power than when idle, and may overload the UPS.
4.6 Connect the telephone/modem lines
(425AP/525AP/625AP models only)
Connect a single line telephone or a modem line into the telephone/modem
surge protection sockets on the back of the UPS. The RJ-45/RJ-11 modular
sockets accept standard single line telephone connections. This connection
will require another length of telephone cable (supplied).
Note: This connection is optional. It is not necessary to use this UPS.
Caution: The telephone line current limiting feature could be rendered
inoperable if improperly installed. Make sure that the telephone line from
the wall is plugged into the connector marked “IN”, and the device to be
protected (telephone, modem, etc.) is plugged into the connector marked
“OUT”.
Caution: This surge protection device is for indoor use only and never
install telephone wiring during a lightning storm.