[Asterisk-Users] X100P question about odd behavior

[Jon Pounder]

I can't speak for the x100p in particular but when a phone jack in an 
arrangement like that has 4wires (2pair) the second pair is normally just 
passed straight through from the line to the phone jack. This may be used 
to supply power to the phones for lighted dials etc, supply end of line 
resistors to ensure circuit integrity, pass a second line straight through 
on the same cable, or various other scenarios. Normally though you will 
only find single pair cable supplied with the device as the patch cable so 
using that effectively limits your options on the second pair right away.

Again I have not actually tested the x100p, but I would assume in offhook 
mode the phone jack is disconnected from the line jack, but I could be 
wrong here, I have seen devices that handle this both ways (jacks in 
parallel and jacks interrupted when off hook.)

The usual way to tell is there are 2 relays in the type that disconnect the 
phone jack from the line jack when off hook (one is the disconnector, and 
one is the hookswitch), but that is just a clue, not a guarantee.


At 10:32 PM 3/6/2003 -0600, you wrote:
>On Thursday 06 March 2003 21:43, Jim Archer wrote:
> > Hi All...
> >
> > I have installed a single X100P card in my PC and am playing
> > with Asterisk. The wire I plugged into the X100P has two POTS
> > lines on it, wired on the RJ45 in the normal way.
>
>1.  It's not two POTS lines.  The second port is a pass-through
>port.
>2.  RJ45 is 4 pair.  The port on the back of the X100P is 1
>pair -- RJ11.
>
> > I am getting odd behavior.  It seems when I dial out that the
> > X100P dials both lines at the same time.
>
>That's understandable; if you've connected two lines together,
>the X100P will take the line off hook.  It has no way of knowing
>that you've plugged two lines together.
>
> > I have two questions.
> >
> > First, I see that the X100P is only a single channel.  Does
> > this mean that I can only use one POTS line with it?  When I
> > installed it I thought that it would support two POTS lines.
> > I guess I thought this because it has an ordinary phone jack
> > that had 4 little metal fingers in it.
>
>Yes; it's only one channel and it can only handle one line at
>once.
>
> > Is it possible that the X100P is really dialing both lines at
> > the same time and if so is there a way to stop this?
>
>Don't connect two lines together via the pass-through port?
>
>-Tilghman
>
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