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Modems that provide diag pages:
(Click each modem name to get to it's diag page)
NOTE: You may need to disconnect the cable line from your modem in order to access the modem's diag page! Also, your cable provider can DISABLE this page, so if it doesn't work, try another method.
Ambit Cable Modems
Motorola Surfboard Line
RCA DCM Line
Most other modems
(Thanks to hsdcable for inspiring me to create this list.)
If you end up having to call Tech Support, they should be able to provide you with the following information:
Fortunately, a lot of providers offer a tool for the techs to use and check signal levels while they're at a job.
While I cannot give you a link to this, I can show you what it looks like. Click here to see my modem levels.
There is also a program you can use to get your modem levels. It's not user friendly, so unless you are familiar with working with DOS, it may be confusing to you.
There is a post in another FAQ with some help on using this program at:
http://www.dslreports.com/faq/2815 (Thanks to Bobcat for the link.)
You can find this program here:
»homepage.ntlworld.com/robin.d.h. ··· ocsdiag/
(Thanks to Justin for the link.)
Here is some sample output from running this program on MY cable modem:
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