User's Manual

ARCXTEND USER MANUAL – R1.4, ISSUE 4
Copyright 2005 Arcwave, Inc. 35
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
between CPE and cable modem or add
amplification.
Redo the CPE alignment process
Verify the wireless range and LOS path
between Hub and CPE are within specified
limits.
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.
Table 4-3: US transmit power level troubleshooting
If the cable modem doesn’t register with the network
If the cable modem does not register with the network, troubleshoot as follows:
Problem Solution
Does not detect and lock on DS channel Check to see if the the MER of the
downstream RF channel is within specificied
limits:
MER should be at or above 27 dB for 64
QAM, and 31 dB for 256 QAM. If it is not,
check the following:
Verify that the Select Downstream Power
setting is correct for the downstream
modulation and wireless range.
Change Downstream Air Frequency to a
different channel to rule out interference.
Verify the wireless range and LOS path
between Hub and CPE are within specified
limits.
Does not detect and lock on US channel Using the cable modem’s diagnostic
interface, see if the cable modem is seeing