-=PCTechTalk=- Re: Cable Modem - Again!
- From: "rawhide101" <rawhide101@xxxxxxxxxxx>
- To: <pctechtalk@xxxxxxxxxxxxx>
- Date: Tue, 27 Aug 2002 00:17:44 -0400
Good evening. Will retain thread for reference info.
I have the SB3100 modem.
Was unsure if my modem address would access your modem so I didn't provide it.
My system has been operating for months with these values (plus or minus one):
Signal Downstream: S/N 35 dB, Power Level 0 dBmV;
Signal Upstream: Power level 54 dBmV As I recall, for my modem, more than 58
dBmV causes crosstalk and the system loses sync, which would cause the symptoms
you have.
Addresses, and more, will show all info on back of modem.
It's easier to read than the plates on the back of the modem.
Logs will show the symptom that existed when things went wrong.
The cable company is apparently up front with you by explaining the situation.
You might insure you are on 'down time' as long as you are unable to use the
cable ISP and you telling the cable company about it.
I rent my modem so the cable company is responsible for everything except my
computer and power connections.
You might have the power outlet for the computer checked to insure it is
properly wired. The ground wire was missing on one of my computers; computer
appeared to be ok; surge protectors weren't happy until ground wire was found in
the wall and attached to receptacle.
You might read literature for all power control devices you use (strips, surge
suppressors, battery backup, etc) to insure all are installed in accordance with
manufacturer's specs. Proper grounding is a must.
If all power devices are properly installed, the problem is not your fault.
Hope cable company fixes what is wrong. When it works, it works... it is
frustrating when it doesn't.
No one else has replied, so I shall...
j
-----Original Message-----
From: pctechtalk-bounce@xxxxxxxxxxxxx
[mailto:pctechtalk-bounce@xxxxxxxxxxxxx]On Behalf Of Cajun
Sent: Monday, August 26, 2002 11:15 PM
To: pctechtalk@xxxxxxxxxxxxx
Subject: -=PCTechTalk=- Cable Modem - Again!
Here's today's update on my cable modem situation after another visit from
Cox. Some of this information could be useful to some of you. I'm running
a Motorola Surfboard 4100. Last night the cable technicians told me on the
phone that they could tell from their end that I had way too much "noise" on
my line, that my modem could only take up to a certain level of "noise," and
that my modem was maxed out with the noise level. They said that this high
volume of "noise" could cause my modem power light to go out or blink, which
it was doing yesterday for the first time. I asked questions and was told
that this could be caused by a slice in the line somewhere, or too much
interference from neighbors on my cable line. Last night I had a connection
according to my modem, but I could not surf, and could not send or receive
email at all. I was dead in the water with a modem showing that I had a
connection. They said the problem was NOT my modem.
As you may recall, a couple of weeks ago we replaced the 3-way splitter
installed by Cox with an amplified splitter from Radio Shack due to poor
quality on several cable channels on our two TV's. The Cox technician who
came out today told me that although that amplifier greatly improved the
picture quality of my TV cable channels, it would also actually amplify
"noise" to my modem, so my modem should not be on the amplifier. He split
the modem off and ran the two TV lines through the amplified splitter,
leaving my modem on the regular splitter. Then he went outside and checked
the lines on my house and on the pole. He found a cut in the cable line at
the pole. He also found something that was not weatherproofed and said that
water had gotten in.
After doing all of this work, he came in and went to Motorola's Surfboard
statistic site (also referred by someone in this group) at 192.168.100.1,
SIGNAL page. Prior to the work this page was showing a 37 dB Signal to
Noise Ratio, and a Power Level of 58 dBm V. After the work, this page was
showing a 38 dB Signal to Noise Ratio, and a Power Level of 45 dBM V. I was
told that the normal Power Level Range is somewhere between 35-48, and 58
was way too high. I was also told that the higher the Signal to Noise Ratio
number the better.
So far, all is going well. Fingers crossed!
Cajun
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