User's Manual

To modem
(no DC)
To AR3155
(with DC)
To AC power
DC power being inserted
to to
modem antenna
Figure 2-9: Power Inserter and AC/DC converter.
2.4 Wireless Cable Modem
Place the wireless cable modem where it will be used and attach the short cable on
the power inserter (labeled “To Modem” in Figure 2-9) to the F connector on the rear
of the modem. Connect the (separate) modem wall-mounted power supply
(included with the wireless cable modem) to the power connector on the rear of the
modem. Plug both wall mounted power supplies into suitable AC power sources –
preferably a UPS or surge protected power strip. Connect a straight-through
10/100BaseT LAN cable between the RJ-45 jack on the modem and the user hub,
router or personal computer.
Figure 2-10 illustrates the modem connections at the back of a typical modem. The
DB-9 connector is a maintenance port for the modem shown.
The CM, when it is first powered up or when it has lost the downstream signal, will
“step” through the standard EIA channel list looking for the downstream signal.
Alternatively, the CM may be optioned through its administrator interface to lock onto
a specific downstream frequency.
ARCXtend manual, August 2003 2-8