User's Manual

The WCM, 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 WCM may be
optioned through its administrator interface to lock onto a specific downstream frequency.
Power inserter
Cable to AR3155
Modem rear panel
Modem power
Ethernet (LAN) cable
Power inserter
power cord
Figure 2-6: Rear view of typical wireless cable modem.
2.5 Installations Close to Hub
The subscriber installation Schematic Diagram (Figure 2-1) shows a 6 or 10 dB attenuator (pad)
installed between the power inserter and the wireless cable modem (“dry” side of the power
inserter). Small pads of many values are available with F-type connectors to screw in line with the
coaxial cable connection, such as Channel Visions #3000-10, and they may be cascaded to sum
their attenuation. At the time of system set-up it may be determined that such pads are required in
subscriber installations extremely close (less than a mile) from the base station site to reduce
excess downstream signal.
2.6 Frequency Channel
The cable modem will automatically search for the active channels, go through a handshake with
the Hub, and be told all the parameters it will need to join the wireless network.
2.7 Modem http Interface
The modem status can be determined by the LEDs and by a browser interface.
The LEDs and their use are:
• Power: ON = power OK
• Cable: ON = ranged & registered with CMTS, blinking= in process
• LAN: ON = connected
June 2003 Page 2-9