User Manual

Installation Guide

24 of 27

Cable Modem Installation

Connect the cable modem the TV port of the DC inserter as shown in the prior

illustration.

Set the upstream signal level

Using the cable modem’s diagnostic interface, check the upstream signal (US) level is

within the desired operating range.

Power level is too high Power level is too low

Decrease the “Upstream Attenuation” setting

in the Arcwave MIB Maintenance page of

the user interface 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.

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.

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 to the DS

channel

Verify that the MER of the downstream RF

channel at the output of the CPE is within

specified limits:

MER should equal to or greater than 28 dB

for 64 QAM, and equal to or greater than

31 dB for 256 QAM. If it is not,

erfor