[Asterisk-Users] Channel bank problem via long cable

[Bonzo Armstrong]

On Mon, Jun 21, 2004 at 03:04:52PM -0500, Nik Martin wrote:
> 
> Nah, a true analyzer will detect framing errors do loopback echo tests, etc.

After much pfutzing around and talking with CAC's tech support, I'm
finally coming around to your original suggestion and am in the process
of finding someone to rent/loan me an analyzer or come out and sniff
the line for me.

My current suspicion (which I'll need an analyzer to confirm or refute) is
that the LBO parameter in zaptel.conf is not actually having an effect.
I have to think that if this was the case for this card in general,
someone else would have run into it before now and would have mentioned
it, but I don't see any references to any such problems in the archives.
But I am curious whether there are people out there successfully driving
their TE405P over more than 400' of cable.

> Try this if possible.  Connect the channel bank to * via the 400' cable, but
> in the same room as the * box, with all the cable coiled on the floor.

I haven't tried this yet as I don't have a 400' cable handy.  But it
just now occurred to me that I have a box at home that might have 400'
left in it so I may be able to try it tomorrow.  I can confirm that I
can talk to at least two of my three access banks with no problem at
all if they're plugged in at 200'.

> ZTTool
> also has a loopback test if I'm not mistaken.  It may give you some insight.

Looping the line up doesn't tell me much.  Neither does plugging a
loopback plug in at either end of the line.  No matter how I loop it,
neither end shows alarms.  Very odd.  Hopefully I'll be able to find
an analyzer tomorrow.