asterisk users - May 2005 - OT: DSL problems - UNREACHABLE - REACHABLE

I could really use some input here, forgive the OT nature, but my
problem is related to asterisk and voIP on a DSL connection and
becoming a big mystery.

I noticed about three weeks ago a lot of UNREACHABLEs that became
REACHABLE 10 seconds later. After studying this a little, it happens
that the DSL connection was stopping every 8 minutes (+ about 3
seconds). The modem doesn't apperat to lose sync, the data flow just
stops. Since then I've removed asterisk from that connection.

Every possible test has been done at our office, three different
modem/routers of different brands were swapped in/out, there is a
second phone line in the same cable that is on a different connection
and it does not have the interruptions. I've turned off every box in
the office and disconnected every cable from the router.Also
disconnected FXO lines, phones and left just a modem/router on.  No
change. The 8 minutes are invariable, so after turning of everything
here, I can't see how it could possibly be any local hardware.

The phone company here has, after being evasive aboput checking the
DSLAM, claimed they did everything possible, changed our DSLAM
connection, tried every piece of equipment on their end. Ditto the ISP
who has been very cooperative.

I can only think of one more possible approach: get the power lines
and the phone line independently checked for some kind of parasitic
interference, say a big machine of some kind going on and off. Why
this affects one DSL connection and not the other... I wouldn't know.

Does anyone have any suggestions about what kind of outfit to look for
that might do this kind of checking? Or any suggestions to pursue at
all?

tia

On May 2, 2005 10:56 am, Wilson Pickett wrote:
> The phone company here has, after being evasive aboput checking the
> DSLAM, claimed they did everything possible, changed our DSLAM
> connection, tried every piece of equipment on their end. Ditto the ISP
> who has been very cooperative.
Can you get stats out of the DSL modem as far as retries and whatnot?  I get 
that occassionally on ours as well (Sangoma S518 ADSL PCI modem) but the 
modem isn't showing anything bad (the odd collision but that's not 10s
long)
-- basically it's something deeper and I believe on the DSLAM side.
> I can only think of one more possible approach: get the power lines
> and the phone line independently checked for some kind of parasitic
> interference, say a big machine of some kind going on and off. Why
> this affects one DSL connection and not the other... I wouldn't know.
The fact that the link doesn't drop suggests that's not the problem but
I
can't be 100% sure.

-A.

Welcome to DSL, the telco didn't do any more tests then required to get
sync for 30 seconds.

Cancel the DSL and get another line. That's about the extent of it, or
at least in Ontario it is, I've had this problem with 5 or 6
connections.

Chad


-----Original Message-----
From: asterisk-users-bounces@lists.digium.com
[mailto:asterisk-users-bounces@lists.digium.com] On Behalf Of Wilson
Pickett
Sent: May 2, 2005 10:56 AM
To: Asterisk Users Mailing List - Non-Commercial Discussion
Subject: [Asterisk-Users] OT: DSL problems - UNREACHABLE - REACHABLE


I could really use some input here, forgive the OT nature, but my
problem is related to asterisk and voIP on a DSL connection and becoming
a big mystery.

I noticed about three weeks ago a lot of UNREACHABLEs that became
REACHABLE 10 seconds later. After studying this a little, it happens
that the DSL connection was stopping every 8 minutes (+ about 3
seconds). The modem doesn't apperat to lose sync, the data flow just
stops. Since then I've removed asterisk from that connection.

Every possible test has been done at our office, three different
modem/routers of different brands were swapped in/out, there is a second
phone line in the same cable that is on a different connection and it
does not have the interruptions. I've turned off every box in the office
and disconnected every cable from the router.Also disconnected FXO
lines, phones and left just a modem/router on.  No change. The 8 minutes
are invariable, so after turning of everything here, I can't see how it
could possibly be any local hardware.

The phone company here has, after being evasive aboput checking the
DSLAM, claimed they did everything possible, changed our DSLAM
connection, tried every piece of equipment on their end. Ditto the ISP
who has been very cooperative.

I can only think of one more possible approach: get the power lines and
the phone line independently checked for some kind of parasitic
interference, say a big machine of some kind going on and off. Why this
affects one DSL connection and not the other... I wouldn't know.

Does anyone have any suggestions about what kind of outfit to look for
that might do this kind of checking? Or any suggestions to pursue at
all?

tia
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