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Forum Thread

Using splitter for signal to TV and cable modem?

jbloggs 9,581 4,487 January 26, 2011 at 10:48 AM
I'm really surprised that Cable modem manufactures don't include a Cable single pass through connection so that you can have Cable modem and tv connected at the same time.

Is there a brand of cable splitter that is best or just any cable splitter will do? I'm trying to avoid any loss in signal quality due to splitting.

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#2
Quote from jbloggs View Post :
I'm really surprised that Cable modem manufactures don't include a Cable single pass through connection so that you can have Cable modem and tv connected at the same time.

Is there a brand of cable splitter that is best or just any cable splitter will do? I'm trying to avoid any loss in signal quality due to splitting.
It goes on the front end, the cable guy should have supplied youwith it.
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#3
Quote from Count_Chocula View Post :
It goes on the front end, the cable guy should have supplied youwith it.
I didn't have (or need) anyone from cable company to come and activate my service.

Not sure what you mean by "it goes on the front end" and are you saying that a splitter should have been provided by cable guy?
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Quote from jbloggs View Post :
I didn't have (or need) anyone from cable company to come and activate my service.

Not sure what you mean by "it goes on the front end" and are you saying that a splitter should have been provided by cable guy?
no, you use the splitter as a lead to the modem
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#5
Quote from jbloggs View Post :
I'm really surprised that Cable modem manufactures don't include a Cable single pass through connection so that you can have Cable modem and tv connected at the same time.

Is there a brand of cable splitter that is best or just any cable splitter will do? I'm trying to avoid any loss in signal quality due to splitting.
Don't shop at the dollar store. That's about it. Obviously, half the signal is lost when you split, but depending on application, you don't need too much.

I don't know enough about the workings of the cable system, but I'd imagine it has to do with the processing of the information. It may be possible in theory but it would be hugely cost prohibitive to add circuitry that decided what info should go to the TV and what should be used by the modem. Especially when a splitter costs a buck bought in bulk.

Quote from jbloggs View Post :
I didn't have (or need) anyone from cable company to come and activate my service.

Not sure what you mean by "it goes on the front end" and are you saying that a splitter should have been provided by cable guy?
The path goes wall -> splitter -> modem or TV.

and yes, when a cable rep "installs" your modem, usually all they do is add on a splitter. And then make a phone call that you can make.
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Last edited by bonkman January 26, 2011 at 10:58 AM
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#6
put cable modem closest to the 'drop' (where cable comes into the home), use one quality 2-way splitter to split that signal between modem and everything else. do not split the modem side any more than that. use an additional (again, quality) splitter on the other side to feed multiple video devices.

if you can, hook the modem up before the line is split for whole-house distribution.. but that's not always possible.. and if it isn't you want an outlet with short in-house run to it and with lowest splitter-caused signal loss
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Last edited by 2cheap4retail January 26, 2011 at 11:13 AM
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#7
Quote from 2cheap4retail View Post :
put cable modem closest to the 'drop' (where cable comes into the home), use one quality 2-way splitter to split that signal between modem and everything else. do not split the modem side any more than that. use an additional (again, quality) splitter on the other side to feed multiple video devices.
this -- and always remember that when you're splitting video sources, use the minimal amount of splitters. ie rather than using 2 two-way splitters, use 1 three-way splitter.
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#8
Quote from bonkman View Post :
this -- and always remember that when you're splitting video sources, use the minimal amount of splitters. ie rather than using 2 two-way splitters, use 1 three-way splitter.
Not necessarily. A cable modem requires a much better signal than cable TV. a 2-way splitter drops the signal less than a 3-way or 4-way splitter so using a 2-way splitter up front and attaching the cable modem to it will give a better signal to the modem. It will degrade the signal more for the other devices though.

If all devices need the best possible signal, then you're right that a single splitter with more outputs is better than multiple levels of splitters.
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#9
Quote from dhc014 View Post :
Not necessarily. A cable modem requires a much better signal than cable TV. a 2-way splitter drops the signal less than a 3-way or 4-way splitter so using a 2-way splitter up front and attaching the cable modem to it will give a better signal to the modem. It will degrade the signal more for the other devices though.

If all devices need the best possible signal, then you're right that a single splitter with more outputs is better than multiple levels of splitters.
Secret That's why I said video sources. Wink
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#10
I know comcast told me to only use I think 1000mhz splitters, not 900mhz, for before the modem.
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#11
Thanks for all the info. I went ahead and purchased the following 2-way splitter

PREMIUM 2 way Coax Cable Splitter F type Screw - 5~2400 MHz [monoprice.com]
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Quote from bonkman View Post :
Secret That's why I said video sources. Wink
Haha, I was so excited to make that post that I conveniently overlooked that.
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#13
Quote from bonkman View Post :
I don't know enough about the workings of the cable system, but I'd imagine it has to do with the processing of the information. It may be possible in theory but it would be hugely cost prohibitive to add circuitry that decided what info should go to the TV and what should be used by the modem. Especially when a splitter costs a buck bought in bulk.
Hmm . . . In theory it's an interesting idea. You've hit the nail on the head wrt the limitation: not every cable system carries their DOCSIS channels on the same QAM. Here we use channels 110-113, or 711-729 mhz. The last system I worked in was a range around ch 83, or 579 mhz. This is important because it would need to be a diplex filter to filter certain frequencies to the modem, and not a splitter. A splitter inside the modem would be just as harmful as one outside, since it passes all frequencies to all ports. Diplex filters can remove certain frequencies.

To the OP, to minimize loss to your modem if you must split in the same room get your hands on a set of directional couplers, not a splitter. They come in varying values, ie DC6, DC8 etc. They have an In, an Out and a Tap leg. Modem would go on the Out, Tv on the Tap. The higher the value, the more loss on the Tap leg (the DC value in dB) and the less loss on the Out. Use the highest value that doesn't degrade you TV service.

In reality if it was installed correctly in nearly all cases your signal can withstand a split just fine. You have to remember that the signal is digital and so quality is not so predicated on strength as it used to be with an analog signal. As long as your modem stays locked consistently, you should be good to go. Stronger signal will not increase your speed, just your chances of staying locked up.
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#14
Quote from dhc014 View Post :
Haha, I was so excited to make that post that I conveniently overlooked that.
Cheers

FWIW, I have my modem after a 4 way splitter and it's absolutely fine.
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#15
But not everyone's cable setup is the same. Not the same plant, not the same drop not the same wiring in the house. One person's modem may die with a single splitter, while another they can split several times without loss. But the best practice is to always split as less as possible and try to minimize the power loss.
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