My modem lights are not lighting up

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crazycbj - Feb 2, 2010 at 09:43 AM
xpcman Posts 19528 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 - Feb 3, 2010 at 04:31 PM
Hello,i have windows xp and my modem is not lighting up.my modem is a motorola surfboard model sb5120.
when I plug it in the power is on but the receive button keeps flashing and it wont connect online.
also my ethernet cord is connected and the pc activity button lights up,and the network also connects
but no internet connection. if someone can help it would be good

3 responses

xpcman Posts 19528 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 1,824
Feb 2, 2010 at 08:37 PM
You probably have a weak signal from the cable. Call your cable operator and have them run a diagnostic. I just went through this with Comcast. You might have a problem in the house wires of in the signal strength from the street.

Good Luck
2
Kmiller4u Posts 9 Registration date Wednesday January 27, 2010 Status Member Last seen February 2, 2010 1
Feb 2, 2010 at 08:47 PM
Try to power off the modem and your computer. Wait for 1 minute before you power on the modem. Then wait for the modem lights to become stable before you turn on the computer. If you still don't have a connection to the Internet, better contact your Internet provider so they can troubleshoot your problem.
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xpcman Posts 19528 Registration date Wednesday October 8, 2008 Status Contributor Last seen June 15, 2019 1,824
Feb 3, 2010 at 04:31 PM
I had Comcast (local cable internet supplier) service my exterior line today.
The serviceman used my browser to display the Motorola modem readings at the end of my house line.
Enter 192.168.100.1 in your browser address line and hit enter
then click on Signal on the left side.

The Downstream Power Level is the most important reading (just remember that -4.0 is better than -10.0). You might still be able to use the internet with a -13 reading but it should be above -10.

SNR (signal to noise ratio) is also important it should be above 33dB.


Readings outside this working range can be caused by a poor signal from the cable supplier or from bad connections (too many splitters) or too long a cable run in your house. Each splitter cuts your Power Level in half. 50 feet of marginal quality or poor connection on the cable might drop the signal by 4 dBmV.

Motorola Surfboard SB5120 QAM 256 (Working range)
Down Power (between -10 and +10 dBmV)
SNR (higher than 33dB)
Up Power (between 30 and 55dBmV)
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