US Cable Support > Cox HSI > [NV] Heat Throwing Off Modem Signal Levels?

[NV] Heat Throwing Off Modem Signal Levels?

I've seen this happen before and the culprit was a bad line amp somewhere down the line. Not saying that's the case in this instance but it can wreak havoc.

interesting maybe i will call in then see if i could a supervisor out to take a look at it

i failed to mention this happened a few weeks back as well

and one more thing no cables or splitters or anything on my end has changed since this started occurring all the cables are new and all the equipment is new

and in past years i have never saw this type of issue before

reply to bryant313
I haven't had any fluctuations on mine here. So it must be something near you.

yeah i am on the phone with tech support and the guy is very knowledgeable and i will have someone out Tuesday to take a look at the issue

yeah he was telling me from comparing some of the different levels on the street that it is at the tap he said the tap itself could be bad or the ports are bad or something at the street is causing this issue

i have no time out errors i was told that i have a very clean signal so i can not be something in my house

and all the cable connections are tight and all the cables are new

Well if there is big change in weather where it gets pretty hot outside, I could see maybe a 3-4db max increase on your upstream power. But the levels you are reporting is showing there is something acting up somewhere. Which could possibly be an amp acting up, as heat only causes issue's. Another reason more people see T3's/T4's in there modem log during the summer.

reply to bryant313
It is the heat. The upstream can peg the top of the limits and you will drop offline.

It also matters if your fiber/coax is above or below ground.

Above ground will see more fluctuations. When I was in NY with OOL, all the fiber/coax was above ground. Hundreds of folks (me included) would see the meter peg to the limit and MODEMs dropped off line all over the place.

The temps in NY are not even close to what we see here in LV. I used to have the formula for every degree in temp how much the Upstream would move. I cannot find it; must have lost it in the move.

I am up in Summerlin and everything is below ground. Right now my Upstream is 42dBmV.
--
"You can observe a lot by watching". Yogi Berra

reply to bryant313
The amps are supposed to have regulation set, which helps it keep a somewhat stable signal levels when the temperature changes, though the regulators sometimes get removed when they are doing maintenance and all works fine without regulation until the temperature changes or they do something at another amp etc, lots of factors go into play as to what can cause the amp to have varying signal levels.
--
»FreeDNS.afraid.org - Free DNS dynamic DNS subdomain and domain hosting

reply to Irish Shark
thing is i never dropped offline while this was happening

reply to lilstone87
my thoughts exactly

reply to XIII
whatever it may be this is not the first time this has happened so hopefully the problem can get resolved

reply to lilstone87
now i am noticing lag when gaming and and some pages loading slower that usual

reply to bryant313
Yea Irish Shark everything is mostly below ground except in Henderson and the East end of the valley.

reply to bryant313

Your right about modem isn't the best at judging signal levels, but if there is that much swing in power levels on a modem. Good chance it's a cable issue on down the line somewhere. Because if the modem is reporting that much of a swing in levels, it would point to a problem with the modem itself, if the modem was old. As for at 56db being room before the modem acts up, please look at the requirements of D3 modems, and the max levels when using a D3 modem. As I know with D3 modems bonding on the upstream the max is 51db, before the modem will have problems bonding on the upstream. Also I am sure even with a D2 modem max is probably only around 53-55db, and he's reporting power level swings up to 56db.

Anyways not to say a modem can't work at levels that high, just don't expect the performance to be good. Also with him complaining of lag now, its possible. As he's reporting big swings in upstream power levels. All I can suggest to him about lag problem, is start running steady traceroutes.

reply to Irish Shark
no errors in my modem logs the internet is running fine today i am still having a tech visit though

reply to lilstone87
well if its the modem this will be the 3rd modem swap in less than a year

reply to lilstone87

Cisco Manual On This MODE>

thank you for the info its much appreciated yeah i am curious myself what they will do if anything for this issue

Re: [NV] Heat Throwing Off Modem Signal Levelthe center s?