User's Manual

User: (leave this blank)
Password: cable
The typical modem screen looks like Figure 2-11.
Figure 2-11: Screen for cable modem status.
2.7 Installations Close to Access Point
Subscriber installations that are very close to the Access Point may have a situation
where the input to the cable modem is overloaded. An overloaded input usually
causes lack of synchronization and/or a high error count. If this is suspected, try a 6,
10 or 20 dB pad/attenuator at the modem input and see if the modem starts to lock
and be error free. If so, leave the pad in place.
The subscriber installation Schematic Diagram (Figure 2-13) shows a “Pad” installed
between the power inserter and the wireless cable modem (the “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.
Figure 2-12 also shows the recommended UPS that most customers already have
for their router and other LAN equipment.
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 Access Point site
to reduce excess downstream signal.
A spectrum analyzer is another way to check symptoms of overloading.
ARCXtend manual, August 2003 2-10