I recently moved a few miles and had my Comcast cable internet activated at
the new address. Never a problem before, but about once a day now the cable
modem status light starts blinking - and of course there is no internet
connectivity.

No amount of configuration, renew / release or power resets of my router or
of the cable modem will fix it. However, disconnecting the RG 6 TV/Internet
cable from the cable modem for a few seconds then screwing it back on fixes
things.
Sometimes it is out for about an hour and fixes itself (based on my
automated ping testing from dslreports.com and the nice graph they provide)

What could this be ? Cable modem reports -12dbm incoming signal level,
within spec I believe... Comcast support has been just too clueless to deal
with.

[This followup was posted to comp.dcom.modems.cable and a copy was sent
to the cited author.]

In article <YpudnWzVmrgLrgXcRVn-vg@comcast.com>, dum@Trescue.com says...
What's your outgoing strength?

I have an RCA modem, and although the incoming was very strong (-5 to
-2), outgoing was a bit weak (48-50). It sometimes had trouble
connecting, and even if I left it on, it would disconnect every once in
awhile. When trying to connect, it sticks at 2 lights flashing, which
means it's trying to establish the uplink. I ended up rearranging the
cabling so it's only going through 1 splitter instead of 2. I now have +
2 to +5 down, and down varies between 43 to 48. I don't leave it on all
the time, but it now connects every time.

When my parents got Comcast, they bought a D-Link. That stays on all
the time with so-so numbers (about -10 to -12 down, 45-48 up) and I
haven't heard any complaints yet.

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maybe that's it
-12 dbmV down, 50 dbmV up

to the basement for me to check how many splitters are in the loop

"Andrew Rossmann" <andysnewsreply@no_junk.comcast.net> wrote in message
news:MPG.1c02ea7dcb1c16b09896f4@news.comcast.gigan ews.com...

In article <A76dnTb_T8SB8wTcRVn-gg@comcast.com>, dum@Trescue.com says...
Upstream uses low frequences below channel 2. Make certain ALL
splitters have frequency ratings on them, and that they start at 5. If
you have any unrated, or start at 40 or 54, replace them.

Generally, any splitters used with cable modems or any cable box that
talks back (most digital boxes) should be rated at a minimum of 5-
900MHz, and ideally 5-1000MHz (1G) or higher. Also, use RG6 or RG6QS
cable whenever possible.

--
If there is a no_junk in my address, please REMOVE it before replying!
All junk mail senders will be prosecuted to the fullest extent of the
law!!
http://home.att.net/~andyross