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chrisk's avatar

Split cable line and still have cable tv but NO internet through Cable Modem?

Asked by chrisk (1 points ) May 23rd, 2010

Only have one cable line coming into our townhouse at 1st floor. Single cable operates 3 cable outlets and also cable modem for high speed internet. The cable coming into house goes up 3 floors and has a 3 wire splitter and the 3 cables go to the cable outlets.
I am adding one more cable outlet on 1st floor, since we have none. I tested my theory by using cable splitter where single cable runs into house and everything worked fine (cable tv AND internet). We have CBC construction and decided to trace where cable comes into house. I found it and CUT the single cable and put RG-6 connectors on and then the same 2 way splitter. Now…have cable TV but NO internet!! So took out 2 way splitter and just used female-to-female F connector where I did original cut and still NO internet but cable TV ok.

I think this is a weak signal issue or too much “noise”?

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8 Answers

HungryGuy's avatar

This is just a guess, but I bet when you cut the cable, you caused a momentaty short which tripped some safety gizmo back at the cable company. You can check the RG-6 connectors to make sure there’s no short, but you probably wouldn’t even get TV if there was a short. If that doesn’t fix it, you’ll probably have to call it in and get yelled at for doing your own cable work.

ragingloli's avatar

Are you sure you have an internet contract with the cable provider? Because internet requires you to be issued an IP address by their servers and if you do not have an account with them, no Internet. You can not leech an Internet connection like you can leech a TV line.

jaytkay's avatar

Do you have a 2-way (also called bi-directional) amplifier?

A 1-way device would prevent internet connection. It would also interfere with TV-on-demand service.

Edit: ”...So took out 2 way splitter and just used female-to-female F connector…”

Sorry, I was not reading carefully.

jaytkay's avatar

The internet worked on the 3rd floor?

perspicacious's avatar

Try using a three-way splitter where the cable comes into the house. Other than that, I have no idea but your signal idea is a real possibility. If the picture on the TV is not top quality you can call the cable company and tell them your signal is not strong enough. I’ve done this twice. (Of course I know that when they get my signal boosted, one of neighbors has probably lost signal strength. It’s a cycle.)

chrisk's avatar

Hungryguy: I can get internet when I bypass my cut though. RG-6 connectors are good, even tried compression fittings, crimped one and twisted…all feel solid. I was thinking that the cable for TV is ANALOG and the frequency for internet is DIGITAL and now signal is too weak or too much noise.
ragingloli: Yes, paying for internet and cable with Comcast. Using Motorolla cable modem supplied by comcast. I am getting Internet when I bypass the splice. Just slower.
Jaytkay: No amps at this point, read they create too much “noise” Just simple splitter. But what is weird is when I removed splitter where I made cable cut… I connected with F-adapter and still no INTERNET , but cable TV…yes. When I bypass this cut totally…get Internet and Cable TV. Do not use Internet on 3rd floor. The way the townhome was wired is one line coming into 1st floor from outside. That ONE line goes all the way up to the 3rd floor closet to a 3-way Unbalanced Splitter. The 3 outs: one out to 1 one bedroom 3rd floor , 2nd out to another bedroom on 3rd floor. 3rd OUT is back to 2nd floor where my cable modem and Comcast digital receiver are where I have to split again to make the internet and cable tv connection.
Perspicacious: how does cable co. increase strength?? Should I tell them what I did or just ask them to increase strength?

Thank you and any other ideas would be beneficial. Does anyone have idea why I am getting cable TV but not Internet? Is it because Analog vs Digital signal OR not strong enough signal?

HungryGuy's avatar

@chrisk – Aha! Then the problem is with your cut-through! It may be blocking bi-directional signals through the cable, and you may have to get one through Comcast that will work with their protocols. Another idea…how many splitters do you have between the cable modem and where the cable enters the house? Split the cable there, then run a cable from that splitter straight to your modem. Then split the other branch as many times as you want to feed all your televisions.

chrisk's avatar

Hungryguy: Thanks for the response. What would cause a bi-directional block?? I like your idea BUT with Concrete construction between floors…really a challenge to hide cable or drill through about 8’” of concrete!

Number of splitters is ridiculous: Original was one cable coming in on first floor that runs all the way to 3rd floor and 3 way unbalanced splitter. From this UB3 (unbal. splitter3) 1 run to 3rd floor master, the next run to 3rd floor bedroom, the 3rd run back to 2nd floor into a 2 way splitter with one run to cable modem and one run to Comcast HD box. So really have 7.0db signal loss to cable modem and cable TV.

My run I put a 2 way splitter on 1st floor so getting an additional 3.5db loss to total 10.5 signal LOSS!

Right now if I can get Comcast to boost the signal I will be happy but will call them after the holiday and let them know what I did and get a service call out here.

Any other ideas would be great.

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