CM500 no connection

Question

I bought a CM500-100NAS from a neighbor to have as a spare, and it only locks into one downstream channel at very low power, -26 dBmV, and no lock on any upstream channel.

I have two other modems that have been connecting OK for several years, though we lose internet in the neighborhood several times a day for a few minutes each.

The neighbor said it worked for him but he doesn't need it anymore. He agreed to take it back if I had any problems. I suspect it's bad but I'd like to get some confirmation before returning it.

I've attached the channel status, I'll follown up with the error log and channel status of my known good modem.

plemans · Answer

no.
if there's 2 good ones. its probably a hardware failure.&nbsp;
I'd be betting on the coax connection in the modem&nbsp;

U230148 · Answer

Here's the error log of the CM500

U230148 · Answer

Here's the connection status of the known good modem

plemans · Answer

try changing coax cables. Also, check any splitters,amplifiers, or signal attenuators. remove them if you have th em.&nbsp;
Your correct in that either something is dropping the power or its bad.
The connection info from the known good ones might help. Plus it might tell us why its dropping daily.&nbsp;

plemans · Answer

power levels look good on the motorola but it hasn't been running long enough to give us logs/errors of much use.&nbsp;
the logs on the cm500 are indicating low power. Again, I'd try a different cable. If the downstream power really is that low, you'd have a much higher upstream value as it'd have to boost its power to communicate with the cmts.&nbsp;
So check the cables to see if theres one thats kinked, damaged, loose, correded, etc.&nbsp;

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CM500 no connection

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