Thank you for being a valued part of the CNET community. As of December 1, 2020, the forums are in read-only format. In early 2021, CNET Forums will no longer be available. We are grateful for the participation and advice you have provided to one another over the years.

Thanks,

CNET Support

Question

docsis 2.0 vs docsis 3.0 compatibility

by Jun 20, 2011 5:17AM PDT

About 3 months ago I was having difficulty getting internet (we have Charter Communications). When I called Charter they told me that my Docsis 2.0 modem was obsolete and I should by a Docsis 3.0. I did - I bought a Mortorola SB6120 and at the same time a new router from Cisco.

Internet was never better until we had quite a storm about a week ago. The power was out 51 hours (luckily we were not at home). When we returned the cable worked fine for the TV and phone but we could not get internet service.

They sent out a technician who said many things that did not make sense. He said my router might not be compatible with the modem (it worked fine for 3 months) - he also said that the modem might be fried from the storm (wouldn't that have effected tv and phone too?).

He installed the old modem (docsis 2.0?) but now internet is very slow and I have to reset the modem and router quite often to get service (I didn't have to do this at all for 3 months)

If the modem is fried what modem should I get now?

Thank you.

Discussion is locked

3 Posts
- Collapse + Expand Details
- Collapse -
Answer
Lets get more scientific...
by Jun 20, 2011 11:47AM PDT

What are the signal levels when you type in 192.168.100.1?
Also can you post the logs from that interface?

Clear the MAC addresses out of any error messages they are unimportant and it can be a security risk to post those.

- Collapse -
Answer
Since the SB6120 worked before,
by Jun 20, 2011 1:00PM PDT

I am assuming it bites the dust and get another one. As for TV and phone, I have Time Warner Cable; tv doesn't require internet therefore modem is not needed and my phone service uses a separate modem/device.

- Collapse -
Answer
The Docsis-3 issue
by Jul 2, 2011 10:44PM PDT

To test and seif the router is bad, simply taake it oout of the picture. Go from modem to computer via Cat-5. On your new modem is it plugged into an outlet directly? Electrical surges can be nasty and it sounds like you all had a terrible storm. So yes it is poosible. If you have it plugged into a surge protector it can hapen also. Surges are funny. A small one can be stopped via surge protecter. Now lightning? I do not care how powerful a persons surge protector is. If you get hit it will do major damage. Think of 10,000 to hundreds of thousands and over a million volts. That is the power of a lighting surge hitting the homes electrical system via a 1 second surge. The only safeway that works is unplugged all items from the wall socket(s).

I also need to get a Docsis-3 modem. I use Comcast and I still get great but inconsistant speeds since they switched. The future is here. Also on the router? IT probably has a reset slot. Reset the router. Also in DOS flush your dns every so often. Command is ipconfig /flushdns .

If you have to get a new modem stick with that same one. That is the one I need to get and it rates high on reviews and in other forums.

Good luck to you and I hope no damage was done.

Back to Internet Service Providers forum

CNET Forums

Operating Systems
Software
Electronics & Gadgets
Hardware
Tablets & Mobile Devices
General Help
Brand Forums
Roadshow Autos
Off Topic

Other Forums

Forum Info