How do I diagnose a potentially failing cable modem?

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How do I diagnose a potentially failing cable modem?

Postby jackneeson » 06 Jun 2018, 05:02

Hello,

For the last couple of weeks I've had "hiccups" every other day or so in my internet connection (Comcast with a Motorola SB5100 modem). I look over at the modem and the "Send" light is usually blinking. The problem goes away in anywhere from 1 - 5 minutes. I have not changed anything on my side.
Is there anything I can do to tell if the problem is with the modem? What are the symptoms of a failing modem? Using speedtest.net I get speeds of 28.93/5.85 if that says anything.
EDIT: I realized that I could access the modem status page through the router (thought I needed a direct connection for some reason):
Downstream Signal to Noise Ratio: 39 dB
Downstream Power Level: 4 dBmV
Upstream Power Level: 54 dBmV

Please help

I didn't find the right solution from the internet.

References:
https://arstechnica.com/civis/viewtopic ... &t=1234891
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Thank you
jackneeson
 
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