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Posted by
New Visitor
Member Since: ‎06-25-2012
Posts: 1

INSTALL THE MOTOROLA SB6121 MODEM

How do I replace and install the Motorola SB6121 modem?  I want to replace the Comcast modem to stop paying for the rental.  Please help.

 

Posted by
Cable Expert
Member Since: ‎06-27-2009
Posts: 11,898

Re: INSTALL THE MOTOROLA SB6121 MODEM

[ Edited ]

When you get your new modem just hook it up in place of your old one and call Comcast, they will activate it for you. You can also activate the new modem by simply opening a web browser and following the prompts (you'll need your account information). Return the old modem to your local Comcast office and make sure you get a receipt. Verify on your next bill that you are no longer being charged a rental fee.

 

Posted by
Regular Problem Solver
Member Since: ‎11-02-2003
Posts: 2,846

Re: INSTALL THE MOTOROLA SB6121 MODEM

At one time, the "walled garden" modem activation site did not work in SOME areas,and you'd end up calling CC anyway.....This MIGHT have changed over the last several months ( tried the "walled garden" with my 6120 -- without success-- about a year ago...)... I just skipped it and called in to provision my 5341J....

God luck!

Posted by
Gold Problem Solver
Member Since: ‎12-03-2007
Posts: 8,643

Re: INSTALL THE MOTOROLA SB6121 MODEM


dsanbo wrote: ...  ( tried the "walled garden" with my 6120 -- without success-- about a year ago...) ...

Self-install works for me if I use the account number from https://customer.comcast.com/Secure/Account.aspx -- the one on that web page, not the one on the PDF statement. The number on the statement has one more digit than the one on the web page. If I use the longer one, the self-install fails.

Posted by
New Visitor
Member Since: ‎06-25-2012
Posts: 1

Re: INSTALL THE MOTOROLA SB6121 MODEM

The SB6121 runs the DOCSIS 3.0 release ... are all Internet performance levels supported by the SB1621 and the latest release of DOCSIS?

Posted by
Gold Problem Solver
Member Since: ‎12-03-2007
Posts: 8,643

Re: INSTALL THE MOTOROLA SB6121 MODEM

DOCSIS 3.0 is the latest version of the standard. The SB1621 is a DOCSIS 3 modem that supports 4 downstream channels. Motorola also makes a modem with 8 downstream channels, but it is not yet on Comcast's approved list. The Zoom 5341J supports 8 downstream channels and is on the approved list.

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