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

New to the Community? Start here.

5,635,902

members

39

online now

1,813,783

discussions

Back to Top

New Motorola SURFboard SB6121 Slow Upload(no upload)

Posted by
Visitor
Message 1 of 9
2,886 Views

I have a new Motorola SURFboard SB6121 that for the first day worked great. Now my upload speed is slow or not working at all. I dont know how much this info below will help solve the problem but tech support has not been able to help me at all. At the moment they are "watching my connection speeds."

 

Modem signal status

 

 

 Upstream Signal to Noise Ratio Unknown great tech support 29.5

Upstream Receive Power 0.0 dBmV

 

Downstream Bonding Channel Value

8 REPLIES
Posted by
Cable Expert

Message 2 of 9
2,838 Views

There does not seem to be any obvious problems on your end. I'm not sure there is much advice we can offer you other than "call for a tech".




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. For information on the program click here.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Mark it as an accepted solution!solution 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.
We ask that you post publicly so people with similar questions may benefit.

Was your question answered? Mark it as an accepted solution!solution Icon
Community Icon
I am not a Comcast employee.

Was your question answered?
Mark it as a solution!solution Icon

Posted by
Valued Contributor

Message 3 of 9
2,830 Views

Edited

Steve


Community Icon
I am a Retired Official Comcast Employee, and I no longer actively support the forum.
Official Employees are from multiple teams within Comcast: Product, Support, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Mark it as an accepted solution!solution Icon
Community Icon
I am an Retired Official Comcast Employee.
Official Employees are from multiple teams within Comcast.
We ask that you post publicly so people with similar questions may benefit.
Was your question answered? Mark it as an accepted solution!solution Icon
Community Icon
Retired Comcast Employee.
Please post so people with similar questions may benefit.
Was your question answered?
Mark it as a solution!solution Icon

Posted by
Visitor
Message 4 of 9
2,809 Views

I have no PMs so I have no idea what you are talking about.

Posted by
Valued Contributor

Message 5 of 9
2,800 Views

Sorry, wrong thread

Steve


Community Icon
I am a Retired Official Comcast Employee, and I no longer actively support the forum.
Official Employees are from multiple teams within Comcast: Product, Support, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Mark it as an accepted solution!solution Icon
Community Icon
I am an Retired Official Comcast Employee.
Official Employees are from multiple teams within Comcast.
We ask that you post publicly so people with similar questions may benefit.
Was your question answered? Mark it as an accepted solution!solution Icon
Community Icon
Retired Comcast Employee.
Please post so people with similar questions may benefit.
Was your question answered?
Mark it as a solution!solution Icon

Posted by
Visitor
Message 6 of 9
2,787 Views

So you can't help me? This seems to be a known issue with this modem from what I can find online.

Posted by
Valued Contributor

Message 7 of 9
2,779 Views

Yes I can but I need some modem info. Send me an email with the modem MAC.

Steve


Community Icon
I am a Retired Official Comcast Employee, and I no longer actively support the forum.
Official Employees are from multiple teams within Comcast: Product, Support, Leadership.
We ask that you post publicly so people with similar questions may benefit from the conversation.

Was your question answered? Mark it as an accepted solution!solution Icon
Community Icon
I am an Retired Official Comcast Employee.
Official Employees are from multiple teams within Comcast.
We ask that you post publicly so people with similar questions may benefit.
Was your question answered? Mark it as an accepted solution!solution Icon
Community Icon
Retired Comcast Employee.
Please post so people with similar questions may benefit.
Was your question answered?
Mark it as a solution!solution Icon

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

Message 8 of 9
2,061 Views

I have the same issue.  Just connected the SB6121 today.  Download speed doubled from 12 to 24 Mbps, but upload decreased from 3.5 Mb down to .75.  I have sent an email to Steve with the MAC address

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

Message 9 of 9
2,002 Views

Didn't get a reply from Steve, but 2 days after my post, my upload is back to 3+ Mb/sec.  YAY!