User's Manual

ARCXTEND 5.8 GHZ USER MANUAL – R1.0, ISSUE 1
Copyright 2005 Arcwave, Inc. 32
Cable Modem Installation
)Connect the cable modem to the modem side of the DC power inserter as shown in Figure
4-4 and Figure 4-6. Complete installation of the cable modem using normal procedures.
If the cable modem registers with the network
Verify the downstream signal level
) Using the cable modem’s diagnostic interface, check that the downstream signal level is
within the desired cable modem operating range.
DS received power level is too high DS received power level is too low
If the DS received power level is too high
install one or more 10 dB (AX3255-ECF-10)
or 20 dB (AX3255-ECF-20) low pass
attenuators between the power inserter and
the cable modem.
If more than 30 dB of attenuation is required
and the Select Downstream Power setting is
High, change the setting to Medium.
Check that the Select Downstream Power
setting is correct.
Reduce the cable and RF hardware loss
between CPE and cable modem or add bi-
directional amplification.
Redo the CPE alignment process
Verify the wireless range and LOS path
between Hub and CPE are within
specified limits.
Table 4-3: DS received power level at the Cable Modem
Verify the upstream signal level
)Using the cable modem’s diagnostic interface, check the upstream signal (US) level is within
the desired operating range.
US transmit power of the cable modem is too
high
US transmit power of the cable modem is
too low
If the US transmit power is too high, decrease
the Upstream Attenuation in the Arcwave MIB
Maintenance page of the user interface
setting by an amount equal to the desired
decrease in the upstream power level. i.e. if
the US transmit power is 50 dBmv and it
should be 45 dBmV then reduced the
Upstream Attenuation setting by 50 dBmV
minus 45 dBmV, or 5 dBmV.
Reduce the cable and RF hardware loss
If the US transmit power is too low,
increase the Upstream Attenuation in the
Arcwave MIB Maintenance page of the
user interface setting by an amount equal
to the desired increase in the upstream
power level. i.e. if the US transmit power
is 40 dBmv and it should be 45 dBmV
then increase the Upstream Attenuation
setting by 50 dBmV minus 45 dBmV, or 5
dBmV.