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Old 07-24-2010, 02:48 PM
 
Location: Victoria TX
42,663 posts, read 75,347,085 times
Reputation: 36174

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I've been getting speed tests way below 1 Mbi, sometimes as low as 0.03, and occasionally so low the speed test won't even run. After an hour or so, they return to the normal 10 Mbi, My cable ISP says they can't detect from the office, even when it is very low. My ping tests go up to the 300s, but there is no packet loss.

A tech came to the house, checked all the wiring, and said he was getting good response times on line, even when the speedtest was down around 2.0, which it was when he was here. They are telling me I "might" need a new modem, but they don't carry a spare with them to test. Powering down the modem to reset has no effect. The modem seems fairly hot---about as hot as a mug with coffee in it that is fairly hot, but can be gulped.

There seems to be a pattern to the timing of the dropouts. Early afternoons on weekends. The dropouts down to about 2 Mbi are usually not noticeable, unless I'm streaming live video or something. When I started writing this, it was way below 1 Mbi, but my internet still responding fast enough to function at a reasonably speed, although sluggish on some sites.

Is there any way to test a modem? What should I tell (or ask) my cable ISP?
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Old 07-24-2010, 03:30 PM
 
10,752 posts, read 17,997,204 times
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Is there a wireless router involved in this setup or are you connected directly to the cable modem?
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Old 07-24-2010, 04:32 PM
 
Location: Victoria TX
42,663 posts, read 75,347,085 times
Reputation: 36174
Quote:
Originally Posted by NHDave View Post
Is there a wireless router involved in this setup or are you connected directly to the cable modem?
Directly to cable. No router at all. After I posted, I disconnected my cable wire from the modem and reconnected, and immediately my speed jumped up to 10. But an hour later, it was back down to 3.

I'd hate to pay $75 for a new modem, if that's not the problem.

(later)

I switched out my cable wires, and it dropped to near zero. Back again with the original, power cycled modem, wrong lights flashed, got nothing. Did it again, got 0.02 Mbi. Phoned cable company, and while I was on the phone, it went back up to 10Mbi, excellent Ping numbers. Another appointment for Tuesday with tech to the house, and he'll have a new modem with him.

Last edited by jtur88; 07-24-2010 at 05:24 PM..
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Old 07-25-2010, 12:05 AM
 
24,503 posts, read 35,952,320 times
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what are the ping times you are getting between you and yahoo or something?

Also, Ping the cable modem (typically 192.168.100.1, ping your own IP, and ping DNS servers). You can use these to rules out bad NIC, ethernet cable, etc.
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Old 07-25-2010, 12:46 PM
 
Location: Victoria TX
42,663 posts, read 75,347,085 times
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Quote:
Originally Posted by NJBest View Post
what are the ping times you are getting between you and yahoo or something?

Also, Ping the cable modem (typically 192.168.100.1, ping your own IP, and ping DNS servers). You can use these to rules out bad NIC, ethernet cable, etc.
How do I do those things? When I use pingtest.net, I get values in the 60s at good times, in the 300s when bad.
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Old 07-25-2010, 12:59 PM
 
Location: Victoria TX
42,663 posts, read 75,347,085 times
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Quote:
Originally Posted by NJBest View Post
what are the ping times you are getting between you and yahoo or something?

Also, Ping the cable modem (typically 192.168.100.1, ping your own IP, and ping DNS servers). You can use these to rules out bad NIC, ethernet cable, etc.
Thanks. All running fine now, ping times are 0 and 1 ms. Around 70 ms to Yahoo, around 40 to my own ISP. I'll try it when its slow.
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Old 07-25-2010, 03:08 PM
 
Location: Victoria TX
42,663 posts, read 75,347,085 times
Reputation: 36174
OK, now with my download speeds testing at 1.52 Mbi, I still ping my modem and my own IP at zero or one. Ping rate to my ISP is from 78 to 101. Ping rate to Yahoo is 69 to 71.

By the time I wrote this, my download speed went to 4.08, I'm supposed to be getting 10 Mbi, and usually do.
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Old 07-26-2010, 12:47 AM
 
1,020 posts, read 2,278,369 times
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This is fairly common. Too many people on the infrastructure it sounds to me. Do you live in a rapid growth area? Do subdivisions pop up frequently (or did they during the housing boom)? Many times, the cable networks and fiber backbones to the net aren't enough to carry everyone. Unfortunately, there is nothing that can be done about that.
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Old 07-26-2010, 10:45 AM
 
Location: Somewhere in northern Alabama
18,500 posts, read 55,418,079 times
Reputation: 32168
That is fairly hot for a lot of electronics. This being summer, it could also be warmer in the room. Before putting a lot of effort into other stuff, I'd aim a small fan at the sucker and see if that made any difference. Rule out the cheap and obvious first.
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Old 07-26-2010, 11:29 AM
 
16,308 posts, read 25,256,087 times
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Any correlation between when it slows down, and time of day, sunny or cloudy, etc.

As harry pointed out, heat can effect electronics and cables!! Hopefully in Tx you ain't suffering through this heat without A/C but cable is outside.

Though rare, I had a problem several years ago where my internet either slowed down, or went out completely, but would return. Long story of trouble shooting short, it turned out the span of cable from the pole to the house apparently stretched when the sun was shining on the cable creating a bad connection. Fortunately when the cable guy did come, it was in the middle of a sunny day, and his equipment showed poor signal at the house and good at the pole, so he replaced it, problem solved.

Many cable modems allow you to view the Signal To Noise Ratio (SNR), which should be 30 or higher. I found that at 29 things slowed down, at 27 I lost all connectivity.

In your browser address bar type in 192.168.100.1 (the most common modem IP) and see if SNR (down) is displayed. It varies from brand to brand, but this site might help SpeedGuide.net :: Cable modem signal levels, or simply Google the make and model of your cable modem.
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