Cable modem not working with TV cable plugged in
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Posted by Luke on November 2, 2006, 1:34 am
Please log in for more thread options Hi! Two bedroom apartment, both bedrooms with TV outlets. Bedroom 1 has an analog TV enabled outlet, bedroom 2 runs a RoadRunner cable modem. This works fine, but I'd like to have a tiny TV-set hooked up in bedroom 2 too. There is TV signal coming from the outlet in bedroom 2, but surprisingly TV and cable modem don't want to work together at the same time (splitting the signal). TV works all the time but cable modem works only when "to-TV" cable is unplugged. Yes, I bought a good splitter (2GHz monster cable for $25) - did not help. Then I tried an amplified 4-out splitter from RadioShack ($50, HDTV & high-Speed ready, gain is 8dB on each output) and still the same. When only modem is connected it works fine. When I plug in the TV cable to the splitter the modem becomes dead after 10-15 seconds and is not able to reinitiate the connection until I unplug the TV cable. Any ideas what's wrong? Is it a signal strength issue or maybe I am missing something? My Internet transfers are pretty good up to 4Mbs. Thanks, Luke | ||||||||||||||||
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Posted by $Bill on November 2, 2006, 7:34 am
Please log in for more thread options Luke wrote: Waste of $25 - take it back if you can. $5 should get a decent 1-2 bi-directional splitter. > help. Then I tried an amplified 4-out splitter from RadioShack ($50,
> HDTV & high-Speed ready, gain is 8dB on each output) and still the > same. When only modem is connected it works fine. When I plug in the TV > cable to the splitter the modem becomes dead after 10-15 seconds and > is not able to reinitiate the connection until I unplug the TV cable. > > Any ideas what's wrong? Is it a signal strength issue or maybe I am > missing something? My Internet transfers are pretty good up to 4Mbs. Are you able to access the power levels on your modem web page ? If so, what are the readings with and without the TV on ? What kind of TV is it ? Plasma by any chance ? How far from modem ? I would think a decent 5-100 MHz 1-2 bi-directional splitter would work if you have good power levels to the bedroom, but normally you only want one splitter on the modem line and that would give you a second one (but it still works with the TV off, so I don't think it's a problem for you having two splitters power-wise). Your description would make one believe there was some sort of interaction between the modem and TV. What are the exact numbers on the 2GHz splitter ? Everything written on it - model, low to high numbers, name, manufacturer. | ||||||||||||||||
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Posted by Luke on November 2, 2006, 8:52 am
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Hello! Here is more details: 1.Modem config page is disabled so no info is available. 2. TV is a regular analog TV-set (2 year old 27" Sony) located about 8-10 feet from the modem. modem located about 2 feet from the wall/outlet 3. There is only one signal split (and splitter) on the cable line in my bedroom 2, the main line splits into 2 lines, one goes to the TVset the other to the modem. Now here is an interesting thing (I wasn't clear enough in my first post). What makes me think it's a signal strength issue is that when I use either regular (for $5, 1GHz, RCA, no other info ) or monster (already returned) splitter, the modem is not working even with TV cable unplugged. It looks like (to me) that the signal after the split is too weak. I mean too weak for the modem since TV always works fine. So I bought an amplified splitter http://www.radioshack.com/product/index.jsp?productId=2103093 which I am also thinking about returning) and there is an improvement! Modem works fine with the splitter on the line (which I interpret as a stronger, amplified signal ) but under one condition: TV cable has to be unplugged. This suggests me that with TV cable on signal gets weaker (is that true?) and modem stops working. My another choice would be a signal booster with very good reviews: http://www.circuitcity.com/ssm/Motorola-Signal-Booster-484095-001-00/sem/rpsm/oid/44964/rpem/ccd/productDetail.do But I am getting a kind of tired of driving back and forth and returning items one by one. And I am not completely sure if it's only the signal strength what causes this weird behavior. Thank you for your reply, problem still not solved! Luke $Bill wrote: > Luke wrote:
> > > Hi!
> > > > Two bedroom apartment, both bedrooms with TV outlets. Bedroom 1 has an > > analog TV enabled outlet, bedroom 2 runs a RoadRunner cable modem. > > This works fine, but I'd like to have a tiny TV-set hooked up in > > bedroom 2 too. There is TV signal coming from the outlet in bedroom 2, > > but surprisingly TV and cable modem don't want to work together at the > > same time (splitting the signal). TV works all the time but cable modem > > works only when "to-TV" cable is unplugged. > > > > Yes, I bought a good splitter (2GHz monster cable for $25) - did not >
> Waste of $25 - take it back if you can. $5 should get a decent 1-2 > bi-directional splitter. > > > help. Then I tried an amplified 4-out splitter from RadioShack ($50,
> > HDTV & high-Speed ready, gain is 8dB on each output) and still the > > same. When only modem is connected it works fine. When I plug in the TV > > cable to the splitter the modem becomes dead after 10-15 seconds and > > is not able to reinitiate the connection until I unplug the TV cable. > > > > Any ideas what's wrong? Is it a signal strength issue or maybe I am > > missing something? My Internet transfers are pretty good up to 4Mbs. >
> Are you able to access the power levels on your modem web page ? > If so, what are the readings with and without the TV on ? > > What kind of TV is it ? Plasma by any chance ? How far from modem ? > > I would think a decent 5-100 MHz 1-2 bi-directional splitter would > work if you have good power levels to the bedroom, but normally you > only want one splitter on the modem line and that would give you a > second one (but it still works with the TV off, so I don't > think it's a problem for you having two splitters power-wise). > Your description would make one believe there was some sort of > interaction between the modem and TV. What are the exact numbers > on the 2GHz splitter ? Everything written on it - model, low to > high numbers, name, manufacturer. | ||||||||||||||||
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Posted by $Bill on November 2, 2006, 9:42 am
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Luke wrote: > Hello!
> > Here is more details: > > 1.Modem config page is disabled so no info is available. Why ? What kind of modem ? Make, model. > 3. There is only one signal split (and splitter) on the cable line in
> my bedroom 2, the main line splits into 2 lines, one goes to the TVset > the other to the modem. So that gives a total of two splits (you always try to keep it to one). What make/model is the other splitter at house entry ? Maybe you should swap that one out. > Now here is an interesting thing (I wasn't clear enough in my first
> post). What makes me think it's a signal strength issue is that when I > use either regular (for $5, 1GHz, RCA, no other info ) or monster I don't like splitters with no info on them. Did you Google the model for more info ? Intermodulation, Return Loss, Isolation, Insertion Loss, etc are all useful pieces of info. > Modem works fine with the splitter on the line (which I interpret as a
> stronger, amplified signal ) but under one condition: TV cable has to > be unplugged. This suggests me that with TV cable on signal gets weaker > (is that true?) and modem stops working. What happens if you put a 75 ohm terminator in the TV leg ? They're real cheap. | ||||||||||||||||
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Posted by Luke on November 2, 2006, 10:55 am
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Hello again! $Bill wrote: > > 1.Modem config page is disabled so no info is available.
>
> Why ? What kind of modem ? Make, model. It's Toshiba 2500/2600 sth. I am at work now, I can post detailed info when I'm back at home. I've read that many cable companies block that page (by firmware changes) so users don't try to hack modems. > So that gives a total of two splits (you always try to keep it to one).
> What make/model is the other splitter at house entry ? Maybe you should > swap that one out. You're right. But the very first split is hidden somewhere inside the walls thus not accessible to me /and I am just renting this apartment/. > I don't like splitters with no info on them. Did you Google the model
> for more info ? Intermodulation, Return Loss, Isolation, Insertion Loss, > etc are all useful pieces of info. Monster info was on manufacturer's web page. As for RCA splitter I didn't find anything. I'll try to buy one more today (a cheap one). But I did checked RCA splitter in my friend's apartment (similar setup, tv/internet split) and it worked fine. > What happens if you put a 75 ohm terminator in the TV leg ? They're
> real cheap. Tried this with RadioShack splitter (it came with 3 terminators) and it didn't help. I'll try to borrow another modem for a few hours tonight and check if that helps. And what do you think about Motorola booster I mentioned previously? Looks like there are dozens satisfied users/owners... Thanks again, Luke | ||||||||||||||||
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>
> Two bedroom apartment, both bedrooms with TV outlets. Bedroom 1 has an
> analog TV enabled outlet, bedroom 2 runs a RoadRunner cable modem.
> This works fine, but I'd like to have a tiny TV-set hooked up in
> bedroom 2 too. There is TV signal coming from the outlet in bedroom 2,
> but surprisingly TV and cable modem don't want to work together at the
> same time (splitting the signal). TV works all the time but cable modem
> works only when "to-TV" cable is unplugged.
>
> Yes, I bought a good splitter (2GHz monster cable for $25) - did not