Internet loosing upstreem connection

[ChaoticRambo]

Okay, I want to explain in detail how my network is setup before getting into the problems:

-The primary cable line enters the house in the basement. This cable line is a CATV 18 AWG coaxial cable.
-The primary cable line goes to a three way splitter provided by Time Warner Cable model number SV-3GT.
-The cable line going to the room with the modem is connected to the 3.5 db loss end of the three way splitter.
-This cable line goes up from the basement to the second floor of the house on a CATV 22 AWG coaxial cable and goes to a wall outlet.
-The modem is connected to this connection with a DS6.10-04 coaxial cable.
-The modem is an ARRIS TM6026 Telephony modem.
-The modem is connected via Ethernet cable to a CISCO Linksys EA6500 wireless router.

So here is the issue.

Seemingly at random the modem will loose connection to the upstream signal. It will sit there with the power light solid, the DS (downstream) light solid, and the US (upstream) light blinking. Sometimes it will fix itself in a few hours, other times it will take all day for it to correct itself and eventually reconnect. I have taken the modem into the basement and connected it directly into the incoming coaxial cable and the modem will connect to the upstream. When I take the modem back upstairs and plug it in as normal, everything lights up and it will start working again. However, simply resetting the modem or disconnecting the coaxial and reconnection it will not correct this problem.

When it is working, the internet is fairly fast and the connection tends to be good.

When the modem is connected and working, here are the stats I get from it:

Downstream
Freq/Power: 747.000 MHz 4 dBmV
Signal to Noise Ratio: 40 dB
Modulation: QAM256
Upstream
Freq/Power: 36.000 MHz 46 dBmV
Channel Type: Mixed (TDMA and ATDMA)
Symbol Rate: 2560 kSym/sec
Modulation: QAM64

I have had Time Warner Cable technicians out to the house, and all they ever say is that our house cable wiring is too small, in reference to the 22 AWG wire. Is this really the cause of all this?

Thanks in advance!

 

[bill001g]

This tends to be very hard to really tell without actual test equipment. 22awg wire generally is rg59 and cable modems as well as high def tv really want rg6. 18awg can be either rg6 or rg59 but it tends to be rg6. Cable modem will work over rg59 but you tend to have more issues with the signal levels. This is not as cut and dried as ethernet is so it hard to say how much cable you can get away with.

It could be that you have a poor end connection on one end but really that is all you can fix. If you have the option to run RG6 it would likely work better. Your only other option would be to find a way to put the modem near the entry and then extend ethernet to the other locations.

 

[doctorgiggles]

why don't you try this...take your modem and take it to where the 3 way is sitting and get RG-6 cable and see what happens for a day. you want to eliminate that cable going upstairs and if it doesn't drop then that cable is your problem have one of them make you a jumper cable so you can put it on the leg that goes to your modem up stairs. I work for a cable company and i have no clue what you mean by 18 AWG, i might know it by a different name like RG59 , RG6 tri or quad shield..please don't buy that walmart cable stuff cause its crap those ends just break off after a while. The return (Upstream) is at 46 which is pretty good. There are some causes that could be going on like line Noise could cause it..if enough noise comes in the modem will have an issue trying to communicate to the outside world, bad cable, connectors not on tight enough, corrosion somewhere. but try connecting the modem to the 3 way and see what happens just to start.

 

[ChaoticRambo]

Thanks for the suggestions. I am not sure if testing it connected directly to the incoming coaxial will be possible due to the placement and nearby obstructions. The other issue is recreating the problem. Sometimes we will go a month without a problem, and then other times it will happen every day for a couple days. It seems to random, and it has been very frustrating.

 

[doctorgiggles]

did they change the drop... might be squirrel chews and water getting in drop if its an over head drop or if its under ground mowers are bad lol

 

[ChaoticRambo]

Well, the cable line comes off the pole at the road and goes underground to our basement. It would probably take a miracle to get the cable company to check that stuff though...

 

[doctorgiggles]

well does it go under the road to your house or the pole is at the same side of your house...they might be able to put a temp on but that rg59 might be alot easier to replace.

 

[ChaoticRambo]

Sorry to revive such an old topic, but the problems only seem to be getting worse, and I have some additional information:

I had a Time Warner Cable tech out who tested the line coming into the house, and he said that line was good. He then tested the line going up to the room with the modem, and he said that line was bad, and he said the problem is the RG59 cable in the wall, and he also replaced the 3 way splitter with a new one. He even provided us with a brand new modem.

The new devices have not fixed the problem, so I decided to test how bad of a signal loss I would have by moving the modem and router into the basement where the cable line enters the house. I had gotten a short bit of RG6 cable, and used that to plug the modem and router into the three way splitter.

The second I tried to get into an on-line game, the same exact problem happened. So now, I have proven that while the cable in the wall may not be ideal, it is not the root cause of my problems. Any thoughts?

 

[doctorgiggles]

answer me this question do it work fine before you get on a game can you surf no problem...and is it every game that you try online game if so what game...what do the light on the modem look like should have some think like power, US, DS, online stuff like that if you are surfing no problem check those lights make sure they are all on usually Power, US, DS stay on and solid but if either US or DS are blinking could be a cable issue. if US is blinking its an UPstream issue and modem can't communicate out if DS blinks and doesn't go to US then its a Downstream issue and info isn't getting to the modem. I am still assuming you have it right where the cable comes in and no splitters are being used so it eliminates all inside lines and only leaves the drop and everything outside.

 

[geniusdevil]

Hey, I had similar issues. Do you have ChromeCast by any chance? My US used to blink every now and then, but after getting rid of ChromeCast, my internet is being running smoothly.