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Grex Info Item 327: Mysterious 20 second pause
Entered by wlevak on Tue Apr 18 17:20:33 UTC 2000:

Since about November, Grex seems to pause for about 20 seconds every few
minutes.  Others I have talked to say they have seen this also, so I know it's
not on my end.  What is Happening here??
PS. I use a dial up connection.

20 responses total.



#1 of 20 by davel on Tue Apr 18 23:32:43 2000:

Line noise, invisible because your error-correcting modem catches it?


#2 of 20 by wlevak on Wed Apr 19 03:10:11 2000:

Of the same duration, and by others too?


#3 of 20 by davel on Fri Apr 21 00:53:32 2000:

You're timing it that closely?  I took that to be a ballpark figure.

There are some areas of MI where we see this all the time when we dial them
up.  The time does vary quite a bit.  Sometimes the line noise is severe
enough to cause a disconnect.  I'm reasonably sure it's line noise because
(1) we *saw* it - huge blasts of noise - in the days before error-correcting
modems, dialing these same places, and (2) if I'm simultaneously on a voice
line with the user when it happens, sometimes I can hear line noise at the
same time.  These experiences are what made me suggest it.


#4 of 20 by wlevak on Fri Apr 21 19:34:42 2000:

No, I'm not timing it, but it about 20 seconds.  It is not the usual couple
of seconds caused by line noise.  Alos this did not occur before November.


#5 of 20 by wlevak on Sun Apr 23 01:27:59 2000:

I guess I forgot to mention that my modem displays the line quality and the
current carrier baud rate.  When these pauses occur, the modem indicates the
line quality is high and the baud rate is still 14.4K.  If I press a key, the
transmit LED flashes.  The receive LED is off.  To me, this indicates that
the line and modem are OK, but nothing is being received, presumably because
nothing is actually being sent.


#6 of 20 by davel on Sun Apr 23 20:44:58 2000:

If your display shows the line quality as high, I'd guess that I was wrong
about line noise.


#7 of 20 by mdw on Mon Apr 24 04:29:26 2000:

The transmit & receive lights on the front are probably wired to the
computer's side of what the modem is doing, not the phone line side.  A
character could be sent to the modem & buffered while the modem sorts
out the phone line condition.


#8 of 20 by wlevak on Tue Apr 25 04:11:33 2000:

Ok, so the receive and transmit lights may not indicate the line conditions,
but line quality and carrier rate are direct line quality indicators.


#9 of 20 by mdw on Tue Apr 25 04:57:30 2000:

Not really.  Carrier rate is just what the logic in the protocol defines
or allows.  Line quality is an estimate made based on error rates seen
over the connection.  The former is definitely a direct line quality
indicator, the latter may be, tho calibration will be a problem.


#10 of 20 by wlevak on Wed Apr 26 04:21:19 2000:

My modem is set to drop to a lower carrier rate if the line quality falls.
Continued high line quality with a constant carrier rate indicates no
deterioration of line quality.

The modem does not think it has a problem.
Other people have the same problem.
This indicates a common source - the GREX dial-in lines.
Couple this with the fact that a number of connection attempts fail outright.


#11 of 20 by mdw on Wed Apr 26 23:47:29 2000:

You and those "other people" could be using lines in the CO that aren't
up to snuff.

The fact of the matter is, I don't think we really have any way to snake
out problems of this nature.  If we can track it down to a particular
modem on the grex end that seems to be much worse than the others, we
can swap out or replace that modem.  If it's a problem with gophers
chewing on the wires outside the building, we *might* be able to
identify a particular line that doesn't get better when the modem is
replaced.  If it's anything else, like a flakey CO line, some weird
protocol problem between grex modems and brand X modems, etc., most of
these are things we can't fix.  At best, we might be able to say "don't
use brand X modems", but even collecting the data to make that kind of
statement would be a challenge.


#12 of 20 by wlevak on Thu Apr 27 03:50:57 2000:

It could be a particular modem or line, but I have no way of knowing since
you do not identify either when a connection is made.

It just paused there again.

Also my first attempt to connect, answered but dropped the connection almost
immediately.



#13 of 20 by davel on Thu Apr 27 20:29:21 2000:

FWIW, I just saw something like a 5- or 10- (or even *could* be 20-) second
hang.  It happened again, twice, while I was typing that first sentence.  But
I've definitely been hearing lots of line noise on the phone, & have to
suspect that as the cause.  I don't know.


#14 of 20 by pbossley on Sun May 21 01:52:10 2000:

It could be server related.  I use a unix shell to telnet to cyberspace.org.
I don't have much trouble (2 to 3 second pauses at the most)


#15 of 20 by d0ppler on Thu Jun 1 20:12:15 2000:

IT could be the FBI...


#16 of 20 by xtiger on Wed Jun 7 01:21:14 2000:

hi everybody,i'm a newcomer  on Grex,i don't know how to  exchange info with
otherone,CAN YOU HELP ME?.


#17 of 20 by rcurl on Wed Jun 7 01:56:22 2000:

You are exchanging information as you write.


#18 of 20 by bjk on Sun Jul 30 12:54:00 2000:

I dont know how to enter a new item here ..so I am entering my doubt here.Any
one reading these item do pls help me.
When we are dual bootin a pc with unix we can mount the hard disk within unix.
Means I am running free bsd and I can mount the dos partition within the
freebsd.
Is it possible to mount a remote hard disk connected by lan to mount to this
m/c
Or how can we access a WINDOWS m/c in a LAN from a FreeBSD??
How can we do that ..

Thanks..


#19 of 20 by byteman on Sun Oct 8 18:55:07 2000:

nothing!


#20 of 20 by noidpara on Sun Oct 29 23:03:45 2000:

Jesus, u better spend more time reading "Tora", rather than confusing ppl with
your foolish replies.
Benny, it`s all possible. All info you need, can
be found in your local FreeBSD docs or on the main FreeBSD site
www.freebsd.org and related conferences.
You can even boot your M$ from remote HDD, controlled by *NIX system. It
depends on
network adapters and PC BIOS you have. Iwill only suggest use NT, `cos
M$95,98,.. are still big security hole IMHO.
ppl, sorry for offtopic.

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