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This is a discussion on Charter No Connection; Signal Issues within the Charter forums, part of the Cable Company Forums category; Hi guys and gals! So I'm currently not able to connect, and I know it's got to be a wiring ... Cable Television Discussion Forums satellite forum diretv forum sling slingbox sony viseo lcd hdtv rca digital cable tv forums 722k 922 slingloaded comcast satellite network time warner azbox fta forum suddenlink coolsat cable dvr receiver 5000 622 HR21 HR20 722 hdtv dbmvtechs hd cable jobs MultiChannel iptv uverse 722 522 622 CE coax Comcast hulu boxee mse
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Thread: Charter No Connection; Signal Issues

  1. 10-24-2009 01:40 PM #1
    Scarface
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    Default Charter No Connection; Signal Issues

    Hi guys and gals!

    So I'm currently not able to connect, and I know it's got to be a wiring issue, but I was hoping someone would be able to assist me in figuring out what might be happening on the line to cause the problem.

    As it stands, I know the signal data is outside the threshold. It is as follows: (two measurements)

    Downstream SNR: 24.2 dB / 19.9 dB
    Downstream Power Level: 23.2 dBmV / 26.5 dBmV

    When the modem is in another room in the house (working, but not ideal for the layout of the house), I'm getting signal data of:

    Signal To Noise Ratio 36.7 dB
    Power Level -4.1 dBmV
    Upstream Power: 49.0 dBmV

    Any ideas on what is causing these values? I'm not too good in this area of computing (my specialty is in kernel mode programming).

    Thanks in advance!
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  2. 10-24-2009 01:41 PM #2
    Short Circuit
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    The initial readings....I'm assuming it's negative 23dbmv? If it's positive, then that outlet is probably hooked up to an amplifier. If it is negative, then it could be a bad splitter, a splitter hooked up backwards, a bad cable, a bad connector on the end of a cable, the braid on the cable shorting out the center conductor, a bad barrel connector in a wallplate, improper splitter configuration...

    Have you moved the modem from where it was originally installed? You'll probably have a splitter for all of the outlets in your house somewhere in your basement or in a box on the side of the house. Different outputs on splitters have varying amounts of signal loss, so the setup needs to be balanced in such a way that all of the outlets work properly. A good installer will have the modem on the splitter leg with the lowest amount of loss. For example, if you have a modem and 4 TVs in other rooms, then you'd have a 2-way splitter first, one side going to the modem, then the other side going to another 4-way splitter for the TVs. If the modem gets moved to one of the other rooms, then it will have moved further down the splitter chain, meaning less signal. Pretty much the same thing applies if you have an amplifier.... Using the previous example, if installed properly you'd have the amplifier between the 2-way and the 4-way. If you moved the modem, it would be receiving an amplified downstream signal, which isn't necessarily a good thing.
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  3. 10-24-2009 01:41 PM #3
    Scarface
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    There's an amp on the line leading to that room in the house, as the line is otherwise extremely snowy on all TV channels. Amp is Motorola 484095-001-00.

    The section of the wiring I do know is as follows
    drop -> amp -> splitter -> splitter (in wall for adjacent rooms) -> room with modem

    Without the amp in place, all of the rooms attached from that local drop get quite snowy picture quality. This may be due to high impudence on the drop (bad line?) or from the splitter (unlikely, but still probable -- I've seen it happen before). Unfortunately, I cannot afford the tools necessary to test the lines themselves.

    What would be the natural progression from here as to root cause?

    Thanks again for your time and help!
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  4. 10-24-2009 01:42 PM #4
    Black Thorn
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    1. The ideal thing is to have a single splitter and run all your coax from there. I know that is not always possible though.

    2. The problem is the amp. When you boost the signal you also boost noise. Basically, you need to remove the amp from the line that is feeding your modem. The Rx power level of 20+ is way too high. I would try hooking up in one of the following ways (top would be ideal):

    drop -> splitter -> amp -> splitter -> TVs
    ----------------> modem

    Where the modem is directly off one port of the splitter and the amp is on the other port.

    Or:

    drop -> splitter -> splitter -> amp -> TVs
    --------------------------> modem

    Where the modem is directly off one port of the second splitter and the amp is on the other port.

    If possible do scenario #1 and run a long ethernet cable from the modem to the computer if you have to.
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