I recently purchased a TV Tuner Card for my pc, and I also have cable modem. The weird thing is when I hook up the cable wire to both the tv tuner and cable modem, the only thing that will work is th tv tuner but not the cable modem. So if I want the cable modem to work I need to disconnect the tv tuner. I also have it on a splitter when I'm trying to get these both to work.....but it's failing.
If anyone can help me out in getting both tv tuner + cable modem to work, I would appreciate it.
Thanks
TV Tuner + Cable Modem Question
hmmm, werid. I have a splitter that splits the cable that comes to basement into 2, 1 goes into TV and the other one goes into my cable modem. Both works, however, the signals is kinda weak due to the fact that it's been splited up like 2 times already before it comes to basement....so I called the cable company up and got a delicated line just for the cable modem, it hasn't been down since then 
well, I guess first you should check is that the spliter is working, as well as other connection. Working meaning having signals coming through.
well, I guess first you should check is that the spliter is working, as well as other connection. Working meaning having signals coming through.
-
YARDofSTUF
- Posts: 70006
- Joined: Sat Nov 11, 2000 12:00 am
- Location: USA
-
monkeyhead
- Posts: 2758
- Joined: Tue Sep 25, 2001 1:27 am
- Location: Killeen, TX
most likely he is YoS.....
yeah... you cant split that line going to the cable modem.....
only once.... and would be best if you did it right when it comes in your house....
had to run a direct line right to my cable modem..... split it right where it comes in the house.... one for cable modem one for tv....
yeah... you cant split that line going to the cable modem.....
only once.... and would be best if you did it right when it comes in your house....
had to run a direct line right to my cable modem..... split it right where it comes in the house.... one for cable modem one for tv....
-
YARDofSTUF
- Posts: 70006
- Joined: Sat Nov 11, 2000 12:00 am
- Location: USA
-
Cable_Dood
- Regular Member
- Posts: 210
- Joined: Fri Jan 25, 2002 3:53 pm
- Location: In the Monolith
ACK
Coming from a cable modem engineer: DO NOT USE BOOSTERS.
1. You should never need a booster if your wiring is right.
Why? You are going to boost the noise along with the signal, because the signal to noise ratio is already too low. Think of it like turning the volume up on a weak radio station. It doesn't sound any better...just louder.
2. If one additional split is knocking out your cable modem, your signal is already too weak. Cable modems should transmit between 38-48 dbmv to reach the CMTS at 0dbmv. The auto-level based on info from the CMTS. At the most the cable modem can crank out +60dbmv. If it still can't hit the CMTS at 0 (60 or more db of loss) then it won't go online. You need some overhead to accomodate resistance flux caused by temp variation.
3. You levels may be ok and poor grounding or incorrect wiring my be to blame. If your electrical grounding is poor or nonexistent, then your PC may be causing a signal problem and injecting said problem out into the cable through the tuner card, thus knocking out the modem. Cable is grounded separately from your house. If the grounding in your house is poor, the difference between the two paths to ground causes RF modulation from 60hz hum on AC. (I could get waay more technical on this point)
If you are not in an apartment, you can go to your ground block (grey plastic box) and rearrange your splitter network so that the feed that goes to your room is one of the first splits from the drop cable. Each split cuts your signal anywhere from 3.5-7.5 dbmv or more.
Who's your cable ISP?
1. You should never need a booster if your wiring is right.
Why? You are going to boost the noise along with the signal, because the signal to noise ratio is already too low. Think of it like turning the volume up on a weak radio station. It doesn't sound any better...just louder.
2. If one additional split is knocking out your cable modem, your signal is already too weak. Cable modems should transmit between 38-48 dbmv to reach the CMTS at 0dbmv. The auto-level based on info from the CMTS. At the most the cable modem can crank out +60dbmv. If it still can't hit the CMTS at 0 (60 or more db of loss) then it won't go online. You need some overhead to accomodate resistance flux caused by temp variation.
3. You levels may be ok and poor grounding or incorrect wiring my be to blame. If your electrical grounding is poor or nonexistent, then your PC may be causing a signal problem and injecting said problem out into the cable through the tuner card, thus knocking out the modem. Cable is grounded separately from your house. If the grounding in your house is poor, the difference between the two paths to ground causes RF modulation from 60hz hum on AC. (I could get waay more technical on this point)
If you are not in an apartment, you can go to your ground block (grey plastic box) and rearrange your splitter network so that the feed that goes to your room is one of the first splits from the drop cable. Each split cuts your signal anywhere from 3.5-7.5 dbmv or more.
Who's your cable ISP?
Test running..........
** Speed 2830(down)/1119(up) kbps **
(At least 56 times faster than a 56k modem)
Logged result.
Finish.
** Speed 2830(down)/1119(up) kbps **
(At least 56 times faster than a 56k modem)
Logged result.
Finish.
-
Cable_Dood
- Regular Member
- Posts: 210
- Joined: Fri Jan 25, 2002 3:53 pm
- Location: In the Monolith
highpass filter
FYI: A highpass filter is an in-line device that only allows certain frequencies to pass. The 'high' in 'highpass' filter means it only passes high freqs and blocks out low freqs.
Cable modems upload a low freqs....thus a hp filter will knock out your cable modem.
Cable companies typically use these to block out homes that are injecting interference in the return path. This is due to crappy inside wiring or leaky appliances. Yes, your bad wiring has an effect on everyone.
They look like 3" long cylinders and are usually on the tap up the pole or inside the green plastic peds if you're fed underground.
--I.E. not a solution to anyone's cable modem problem unless you're the one screwing it up for the whole neighborhood.
Cable modems upload a low freqs....thus a hp filter will knock out your cable modem.
Cable companies typically use these to block out homes that are injecting interference in the return path. This is due to crappy inside wiring or leaky appliances. Yes, your bad wiring has an effect on everyone.
They look like 3" long cylinders and are usually on the tap up the pole or inside the green plastic peds if you're fed underground.
--I.E. not a solution to anyone's cable modem problem unless you're the one screwing it up for the whole neighborhood.
Test running..........
** Speed 2830(down)/1119(up) kbps **
(At least 56 times faster than a 56k modem)
Logged result.
Finish.
** Speed 2830(down)/1119(up) kbps **
(At least 56 times faster than a 56k modem)
Logged result.
Finish.
My cable modem provider is Adelphia.
The thing is I live in a house, and when I moved in there were no cable outlets in my room nor the other room. So the cable guy had to run it from the master bedroom and add two splitters one from the master bedroom to the other room and split that to my room. I don't know why this house is so ghetto like that. but I guess i'm going to have to call them and ask them to come out and fix the problem.
The thing is I live in a house, and when I moved in there were no cable outlets in my room nor the other room. So the cable guy had to run it from the master bedroom and add two splitters one from the master bedroom to the other room and split that to my room. I don't know why this house is so ghetto like that. but I guess i'm going to have to call them and ask them to come out and fix the problem.
-
deleted_acct
Originally posted by Chillinhh
WEll THe cable dude told me that the more times the internet is split then the slower it could be and the more in could go out of sync because it has to work harder and talk louder to the cable box or isp or whatever and its harder for it to do taht with a splitters on it.
I donno about the going slow part, but for sure it'll go out of sync. My cable modem got me so frustrated when i had my cable splitted up back then. It goes down every 5 mins for 2 hrs each, so basically i had to use dial up until the dude comes and fixed the problem
-
Cable_Dood
- Regular Member
- Posts: 210
- Joined: Fri Jan 25, 2002 3:53 pm
- Location: In the Monolith
Splitters
Splitters have no effect on speed or 'sync', only the amount of signal power required to get back to the headend. It is only once your cable is split to the point that the modem is maxxed out that it will drop offline.
The wiring standard for most HFC cable companies these days is an RG56 drop to the tap and a direct line to each outlet from the ground block.
Virtually **all** cable modem problems are due to poor wiring between the tap and the modem. Houses built until the late 80's mostly used loop wiring, which means that each room has a splitter going to the next. This is bad...most of the time modems barely work and customers have no idea. Cable modems are extremely resilient to bad line conditions. If your modem is struggling, then your line is baaaaad.
The wiring standard for most HFC cable companies these days is an RG56 drop to the tap and a direct line to each outlet from the ground block.
Virtually **all** cable modem problems are due to poor wiring between the tap and the modem. Houses built until the late 80's mostly used loop wiring, which means that each room has a splitter going to the next. This is bad...most of the time modems barely work and customers have no idea. Cable modems are extremely resilient to bad line conditions. If your modem is struggling, then your line is baaaaad.
Test running..........
** Speed 2830(down)/1119(up) kbps **
(At least 56 times faster than a 56k modem)
Logged result.
Finish.
** Speed 2830(down)/1119(up) kbps **
(At least 56 times faster than a 56k modem)
Logged result.
Finish.
-
martialcomp
- Regular Member
- Posts: 338
- Joined: Sun Jan 23, 2000 12:00 am
TX power.
If a modem were transmitting at very low TX power, would it mean that the modem was bad?
Say below 30 dbmv?
Say below 30 dbmv?
