Welcome to Comcast Help & Support Forums
Find solutions, share knowledge, and get answers from customers and experts

New to the Community? Start here.

5,496,058

members

43

online now

1,702,732

discussions

No Internet connection - US and DS lights blinking on modem

SOLVED
Posted by
Visitor
  • Congrats on Posting your first topic!

Member Since: ‎02-08-2013
Posts: 1
Message 1 of 12 (471,783 Views)

No Internet connection - US and DS lights blinking on modem

For the last couple of days I have had no Internet access. I've tried resetting everything by unplugging things and hitting the reset button, but  nothing works. I've noticed that the US and DS buttons on the modem are blinking, which they didn't do before.

 

Can anybody offer any advice on what this might mean. I am definitely NOT technology savvy so any help would be appreciated. My cable and phone are working.

 

Thank you

11 REPLIES
Posted by
Problem Solver

Member Since: ‎01-11-2013
Posts: 1,316
Message 2 of 12 (471,791 Views)

Re: No Internet connection - US and DS lights blinking on modem

That is very bad, and means you can not connect, US is the first phase and means upstream,

and ds means downstream.

To connect the modem needs to find the downstream signals and get its clock synced to the right frequency and to locate all the channels.  Then it needs to find the upstream channel and adjust its power till the other side sees it,  it needs to lock the phase correctly of the signal so it can transmit in the correct time slots or so.

 

The US and DS lights mean the modem is trying to do that phase of calibration, so it means that the wire must not be very good, or disconnected, or bad or the modem has failed.

 

It is very bad.

Posted by
Edited on
‎02-08-2013 05:29 PM

Connection Expert

Member Since: ‎12-24-2003
Posts: 51,662
Message 3 of 12 (633,504 Views)

Re: No Internet connection - US and DS lights blinking on modem

[ Edited ]

Bottom line regardless of any technical mumbo jumbo accurate or not, this is primarily a customer to customer type of help venue here so you are not speaking directly to Comcast employees. So have you called this in ?

 

Do you also have their T.V. service ? If so, is that down as well ?




Community Icon
I am not a Comcast employee, I am a paying customer just like you! I am an XFINITY Forum Expert and I am here to help.To learn more about XFINITY Forum Expert program click here.
Was your question answered? Mark it as an accepted solution!solution Icon
Did this post help? Why not give it a kudo!!!Kudos Icon
Community Icon
I am not a Comcast employee, I am a paying customer just like you! I am an XFINITY Forum Expert and I am here to help.To learn more about XFINITY Forum Expert program click here.
Community Icon
I am an XFINITY Forum Expert and I am here to help. Expert Program
Posted by
Problem Solver

Member Since: ‎01-11-2013
Posts: 1,316
Message 4 of 12 (471,779 Views)

Re: No Internet connection - US and DS lights blinking on modem

If your TV is broken, maybe there is an outage or the cable is broken or something.

If you call it in, they can check if there is an outage and if it is just you.

 

If an outage, then they might fix it outside since it bothers other people also.

 

If it is just you then they need to send someone to fix whatever it is.

 

E.G. knows this mumbo jumbo more than me, I had a bad modem that did US, and DS and then failed at connect, the technician replaced it.

 

 

Posted by
Silver Problem Solver

Member Since: ‎01-11-2010
Posts: 5,620
Message 5 of 12 (471,741 Views)

Re: No Internet connection - US and DS lights blinking on modem

The OP wrote this

My cable and phone are working.

 

If the OP is renting a modem from Comcast it might be worth getting a different modem from them. If they own the modem it might be worth getting the lines checked first before buying a new modem.

 

Posted by
Connection Expert

Member Since: ‎12-24-2003
Posts: 51,662
Message 6 of 12 (471,701 Views)

Re: No Internet connection - US and DS lights blinking on modem


commanguy wrote:

The OP wrote this

My cable and phone are working.


I don't see that ?




Community Icon
I am not a Comcast employee, I am a paying customer just like you! I am an XFINITY Forum Expert and I am here to help.To learn more about XFINITY Forum Expert program click here.
Was your question answered? Mark it as an accepted solution!solution Icon
Did this post help? Why not give it a kudo!!!Kudos Icon
Community Icon
I am not a Comcast employee, I am a paying customer just like you! I am an XFINITY Forum Expert and I am here to help.To learn more about XFINITY Forum Expert program click here.
Community Icon
I am an XFINITY Forum Expert and I am here to help. Expert Program
Posted by
Silver Problem Solver

Member Since: ‎01-11-2010
Posts: 5,620
Message 7 of 12 (471,685 Views)

Re: No Internet connection - US and DS lights blinking on modem

Could have sworn it was there last evening.

Maybe more coffee???

Apologies for any confusion.

 

Posted by
Gold Problem Solver

Member Since: ‎12-03-2007
Posts: 11,555
Message 8 of 12 (471,639 Views)

Re: No Internet connection - US and DS lights blinking on modem


commanguy wrote: Could have sworn it was there last evening. ...

Still is, isn't it? In post #1? :


... Can anybody offer any advice on what this might mean. I am definitely NOT technology savvy so any help would be appreciated. My cable and phone are working. ...
Posted by
Connection Expert

Member Since: ‎12-24-2003
Posts: 51,662
Message 9 of 12 (471,628 Views)

Re: No Internet connection - US and DS lights blinking on modem

Yep. My bad. Smiley Sad My apologies to commonguy.




Community Icon
I am not a Comcast employee, I am a paying customer just like you! I am an XFINITY Forum Expert and I am here to help.To learn more about XFINITY Forum Expert program click here.
Was your question answered? Mark it as an accepted solution!solution Icon
Did this post help? Why not give it a kudo!!!Kudos Icon
Community Icon
I am not a Comcast employee, I am a paying customer just like you! I am an XFINITY Forum Expert and I am here to help.To learn more about XFINITY Forum Expert program click here.
Community Icon
I am an XFINITY Forum Expert and I am here to help. Expert Program
Posted by
Silver Problem Solver

Member Since: ‎01-11-2010
Posts: 5,620
Message 10 of 12 (471,590 Views)

Re: No Internet connection - US and DS lights blinking on modem

EG

No problem

BruceW

Thanks, on my review I must have missed post #1. Maybe time for new glasses or a better brand of caffine.

Posted by
Problem Solver

Member Since: ‎01-11-2013
Posts: 1,316
Message 11 of 12 (471,584 Views)

Re: No Internet connection - US and DS lights blinking on modem

Is the phone hooked to the modem with the US and DS lights blinking?

How could an internet phone work without basic connectivity?

 

Or is it an AT&T phone, or is it connected to a different device?

 

This is quite odd.

 

Posted by
Visitor
  • Thank you contributor for your first reply to the community!
 Posting replies is the best way to get involved.

Member Since: ‎04-06-2013
Posts: 1
Message 12 of 12 (471,043 Views)

Re: No Internet connection - US and DS lights blinking on modem

I have also been having the same issue. The tech was here two days ago knowing what modem I have but still brought the same one to replace it. He then got on the phone and told me I need to upgrade my modem. They were already aware that I need the upgrade but still sent the guy with the same modem, (TM602G/CT). The best part is this morning I received a phone call the day after the tech was here, which was a recording, from Comcast TELLING me that I need to upgrade my modem but I have to do it online. Why couldn't they just send one with the tech???

 

Sorry for my rant but this may be your issue as well as a lot of Comcast subscribers with certain modems that are experiencing this issue.