et me start by saying I know very little about networking issues.
Hopefully, at the end of this, someone can tell me what the next step
is to diagnose my problem. I live in jacksonville, Florida, and have
Comcast as my broadband provider, using a Motorola SB 5120 cable modem,
provided by ComCast. I know that ComCast has been having some
problems with their service lately and that may be part of my problem.
I've had broadband for just over a year, and other than some problems
when I first got it, it has been working without a hitch for a year.
Over the last couple of weeks my broadband connection would go out,
with the Receive and Send lights on the cable modem blinking, and the
Online light being dark. I tried unplugging the power supply to the
cable modem for a minute or two, and then plugging it back in, but the
modem would not reconnect. I called ComCast, but other than saying
their service was down for a while, or offering to send someone out to
look at it, that was about it.
Here's what I did find out. If I disconnect my cable modem completely
and take the modem and the power supply (AC) cord into my attic, I can
plug the cable that supplies my house directly into the modem and plug
in the power supply cord, the modem will connect and all four lights
(Power, Receive,Send Online) will be on (not flashing). I takes about
2 or 3 minutes to disconnect the modem, carry it into the attic, and
plug it in, which seems to "reset" the modem. I can then disconnect
it, take it back to my computer room, hook it up, and it will work for
fine for a few days, or until the next service interruption by ComCast.
One thing to note about the way the modem is connected to the cable
supply in the attic. The cable comes into my house into the attic, and
then goes into a cable amplifier. It was an Electroline model 2400 4
port amplifier. When I first got broadband, the cable modem would
sometimes lose the connection, (the send and receive lights would
flash, and the online light would be dark). So I hooked the cable
going to the cable modem directly into one of the Out ports on the
Electroline model 2400 4 port amplifier. The cable that goes from the
amplifier to my cable model is 50 feet long. I've had no problems for
a year. However last week when I went to check the connection I
noticed that the Electroline amplifier was really warm, almost hot to
the touch, too hot to really hold in your hand comfortably. It was
about 75 degrees F. outside, and the attic was a little hotter, but not
nearly as hot as the amplifier was. After a couple of times of
connecting the modem in the attic (to "reset" it), I bought another 4
port modem off of eBay. It was a Scientific Atlanta "new in the box"
amplifier. (Note: both the Electroline and the Scientific Atlanta amps
were 1 GHz amplifiers, and amplify 7dB). I replaced the old one with
the Scientific Atlanta amplifier, and this worked fine for about 4 or 5
days. Then there was some kind of interruption, and I had to go back
into the attic, and hook the modem up directly to the cable coming into
my house and the modem "reset" itself.
OK. After all that explanation (sorry it was a so long), can anyone
answer the following for me, (please)?
1). What's going on here and how do I fix it? Any insight would be
2). Can a cable amplifier go "bad". It was only two years old.
3). If a cable amplifier is really warm, borderline