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Motorola Surfboard model SB5101U wont stop blinking past send. Resets to receive, but wont go past send. Comcast can't receive or send a signal

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Receive light blinking


First make sure your router is working (can you ping it?)
Open the modem's web page at 192.168.100.1 and check the Status. Also look at the Signal-to-Noise ratio. Check the logs for obvious errors.
Do NOT change any settings if you don't know what your doing!
If you have exchanged the modem, comcast has to know the new MAC address or your modem will not authenticate.

Either post your findings here or call comcast again - there might be an issue with the connection to the outside, since you are (hopefully) getting an IP address on your computer and the modem is powering on.
Question always is: is this your modem or did you lease it from Comcast? If it's theirs, they have to fix it, if it's yours you can call and tell them that internally everything is working.

Let me know if you need more help.

Aug 15, 2013 | Arris SURFboard® SB5101 Cable Modem

1 Answer

My modem has a problem where it has two blinking lights ( send and recieve) can you help


hi,

Its normal for your modem to have a blinking send and received lights because that means that its sending and received data from the server itself...

Hope this will help... your response is very much appreciated...

Jan 21, 2011 | Arris SURFboard SB5101U DOCSIS 2.0 Cable...

1 Answer

Will this work with Comcast broadband and Windows 7?


This modem will work with Comcast High Speed Internet.
You will have to contact Motorola for drivers for the Windows 7.

It does matter how fast your internet speed is,anything faster than 20meg,will need a Docsis 3.0 modem.

Jan 13, 2011 | Arris SURFboard SB5101U DOCSIS 2.0 Cable...

1 Answer

I recently purchase comcast internet and cable. I have a motorola surfboard SB5101U cable modem and when I try 2 connect my xbox to xboxlive, it says that my network doesn't have a sufficient MTU setting....


You actually should call comcast and tell them about the issue, They have a backdoor into your modem that they can troubleshoot it for you. The issue with their modems is they are usually locked with some weird password they use.

Usually with a modem or router you can dial an internal page but there system like Time Warner is set to their needs so that they can keep that back-door open.

Comcast phone number is 1-800-266-2278 or 1-800-Comcast same numbers thats just the way they word it on their site.

Oct 21, 2010 | Arris SURFboard® SB5101 Cable Modem

1 Answer

I have been with Comcast for 6 years. Leasing their SB5120 modem for 3-4 years, no problem. Then bought one myself and no problem for 2 years with Negtar wireless router. For the past few days, it started...


generally a wireing issue or signal issue i assume by this time you have it fixed by the date. you can check 192.168.100.1 in a web browser and it should show the signals. if recieve is flashing then the downstream is either out of range or something else. it wont go to upstream until it locks onto downstream first.

Feb 08, 2010 | Arris SURFboard SB5120 Modem

2 Answers

My Motorola Sb5101 modem will not let me access the internet, the send light constantly flashes and i can't attain any internet connection.


If you have the following lights :
Power light - on
Receive light - flashing
Send light - flashing
Online light - off
PC/Activity - on
Standby - off
Then your Network Access is OFF - modem is successfuly registered but Network Access Control is disabled via DOCSIS configuration file.

Call your internet service provider....

Nov 06, 2009 | Arris SURFboard SB5101 Cable Modem

3 Answers

No connectivity; constant blinking LED lights "Receive" and "Send"


Or you didn't pay your subscription on time and the ISP disabled your cable modem to send user traffic over the cable network. When both Send and Receive lights are blinking that is a visual aid that the modem is working fine, but the ISP disabled its access to the network (unpaid bill, legal issues, etc.)

May 17, 2009 | Arris SURFboard SB5101 Cable Modem

1 Answer

Cannot set up Motorola Surfboard SB5120 modem


This usually means something is not correct with your incoming signal. If your cable wire into the modem is being run off an amplifier in the wall this could be effecting your service. If the signal is too strong the modem won't be able to communicate for internet.

You could check the incoming wire to see if it is running off an amplifier. If it is you would need to run a new line that is not on the amplifier. I would recommend comcast coming out to check the signal frequency and make the necessary adjustments.

May 04, 2009 | Arris SURFboard SB5120 Modem

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