Desperate Help Needed— Complex Networking Issue

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Okay, so I hope you take the time to read this and help because I really need it.

My Internet Service Provider is Time Warner Cable. Yesterday, we upgraded our plan from the Standard Internet (15mb download 1mb upload) to the Extreme Plan (30mb download 5mb upload). We got a great deal for this and they changed our plan instantly at TWC.

Our old modem was too slow, so we bought a DOCSIS 3.0 modem, the Motorola Surfboard SB6121. We activated the modem at Time Warner, brought it home. We hooked everything in properly— Ethernet, power cord, and coax cable. The modem lights lit one by one properly, but the Internet light that looks like a globe was blinking green, meaning we could get no Internet.

10 hours later, the light somehow became solidly lit, and we connected to the Internet, but the only page it would take us to was our ISP page. I unplugged and re-plugged the modem, and then afterwards the router, and the light began blinking forever again and not working at all.

We returned it today and bought a bit better modem but very similar, the Motorola SB6141. We activated it with our ISP, came home, plugged it in properly, and the same thing happens— the Internet connectivity light blinks green and we have no connection. I tried plugging in a really old modem in my house and that modem DID get connectivity (though it is slow and not activated, it would only go to the ISP page). But the other modems did not work, the new ones that is.

I think it may be a problem with the coax cable, but since TWO modems did not work I am unsure. My question is, for newer models of modems, are there newer coax cables required for them? Mine are a bit old. But remember, the old modem WORKED and the two new ones did NOT. Any help appreciated, thanks!
 

RealBeast

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You usually have to activate the modem with your provider after it is connected. Just attach and turn on the new modem and then call TWC tech support and tell them you have a new modem that needs to be activated online. They can do it in a couple of minutes.
 
"Activation" probably only identifies the modem's MAC as acceptible to the ISP.

You probably need to enter your ISP connection info and password. Then go through and change the default security settings. Otherwise, anybody who knows the default settings will be able to access and modify it. You do this with a browser and the modem's network address on your home system. Go through the documentation that came with the modem to detrmine how to do this.
 
Just call the TWC and tell them to remotely reset your new modem. If you have too many splitters upstream of the modem (i.e. a T-connector so you can watch TV and feed the modem from the same wall jack) you might have a crummy splitter with enough loss that the modem can't lock in at the new higher speed - I had that happen. A new splitter solved the problem.
 
Oh okay so I go to 192.168.100.1 and access my modem configuration page. Also, I screwed in one coaxial cable just a tad bit tighter with a wrench and broke the cable. I don't care about the cable, but would the modem be alright? All I did was separate the nut from the cable, the nut used for screwing.
 
You need to call TWC tech support, and they need to connect the modem.

I had a similar experience with Optimum. I got the modem at their store, and they scanned the bar code. I asked if it was all activated and told it was. When I got it home, it was not working, and when I called tech support, they had to get it working over the phone. Painful 45 minutes on the phone, and not sure why it was necessary.
 

RealBeast

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Yes, he must call TWC tech support to allow his modem to receive an IP address from their DHCP server. Had he done that as I initially suggested his Internet would be working already.

I've replaced scores of cable modems and they almost always require a tech support call to activate while the modem is installed, not before at their office.

 
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