[VoIP] WE 2500 question

Wed Mar 14 14:34:09 CST 2007

Hello,
The polarity reversal idea worked! I didn't seriously think it would. I'd
pretty much decided that my IAXy wasn't providing enough power. But doing
what Steph suggested fixed the problem! Thanks everybody!
Jayson.

----- Original Message ----- 
From: "Steph Kerman" <stfkerman at jps.net>
To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
Cc: "Jayson Smith" <ratguy at bellsouth.net>
Sent: Wednesday, March 14, 2007 4:42 PM
Subject: Re: [VoIP] WE 2500 question

> Fine.
>
> First let's define terms.  A plug is a male connector attached to the
> end of a cord.  A jack is a female connector, usually mounted stationary
> mounted to a surface or in a piece of equipment
>
> Standard double plug-ended modular cords inherently reverse the polarity
> of the line.  This is because they are flat, have a ridge along one
> face, and the plugs are installed with the latching key on the same side
> as the ridge.   This reversal is normally compensated by the fact that
> the wall jack and jack in the base of the phone are different, with
> oppositely color coded contacts.  Because of this inherent reversal, if
> you connect a standard flat line cord between 2 wall jacks or 2
> telephone set base jacks you will find continuity between red at one end
> and green at the other, rather than between identical colors as you
> probably would expect.
>
> For this reason, if you plug your phone into one jack of the "T" and use
> a second line cord to patch the second jack of the "T" to the wall, this
> will reverse the polarity fed to the phone.  The male end of the "T"
> which normally would be inserted in a wall jack is unused when using a
> "T" to reverse polarity this way.
>
> Steph
>
> Jayson Smith wrote:
> > Hi,
> > Yes, we've got lots of those. We usually get them at Radio Shack.
They've
> > got them now with two, three, four, or maybe even more jacks. I think I
have
> > both the type that is an adaptor block, and also the type that has the
phone
> > jacks at the other end of a long phone cord, thus my "extension"
reference.
> > Jayson.
> >
> > ----- Original Message ----- 
> > From: "Steph Kerman" <stfkerman at jps.net>
> > To: "Voice Over IP Tandem for Analog Switches" <voip at ckts.info>
> > Cc: "Jayson Smith" <ratguy at bellsouth.net>
> > Sent: Wednesday, March 14, 2007 4:27 PM
> > Subject: Re: [VoIP] WE 2500 question
> >
> >
> >
> >> There is a widely available adapter that you plug into an existing jack
> >> and which has 2 jacks on the back into which 2 devices can be plugged
> >> instead of the single device that could have been plugged into the
> >> original jack.  Most people call it a "T" or "tee".  Do you have one?
> >> "duplex/extension" means anything and nothing to me.
> >>
> >> Steph
> >>
> >> Jayson Smith wrote:
> >>
> >>> Hi,
> >>> Do you mean, like a duplex/extension/whatever you call those? The
phone
> >>>
> > does
> >
> >>> have a modular jack.
> >>> Jayson.
> >>>
> >>> ----- Original Message ----- 
> >>> From: "Steph Kerman" <stfkerman at jps.net>
> >>> To: "Jayson Smith" <ratguy at bellsouth.net>; "Voice Over IP Tandem for
> >>>
> > Analog
> >
> >>> Switches" <voip at ckts.info>
> >>> Sent: Wednesday, March 14, 2007 4:18 PM
> >>> Subject: Re: [VoIP] WE 2500 question
> >>>
> >>>
> >>>
> >>>
> >>>> Does the phone have a modular plug?
> >>>>
> >>>> Do you have a modular "T" for connecting 2 phones to the same jack?
> >>>>
> >>>> Steph
> >>>>
> >>>> Jayson Smith wrote:
> >>>>
> >>>>
> >>>>> Hi,
> >>>>> Unfortunately, being blind, I'm not in a good position to measure
> >>>>>
> > those
> >
> >>>>> voltages. I just tried several phone cords, including the one
shipped
> >>>>>
> >>>>>
> >>> with
> >>>
> >>>
> >>>>> the phone, on my unused BPA-410. None worked. I like the phone, it's
> >>>>>
> >>>>>
> >>> exactly
> >>>
> >>>
> >>>>> what I wanted, I just wish it'd work on my IAXy!
> >>>>> Jayson.
> >>>>>
> >>>>> ----- Original Message ----- 
> >>>>> From: "Martin Harriss" <martin at Princeton.EDU>
> >>>>> To: "Jayson Smith" <ratguy at bellsouth.net>; "Voice Over IP Tandem for
> >>>>>
> >>>>>
> >>> Analog
> >>>
> >>>
> >>>>> Switches" <voip at ckts.info>
> >>>>> Sent: Wednesday, March 14, 2007 3:05 PM
> >>>>> Subject: Re: [VoIP] WE 2500 question
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>> Jayson Smith wrote:
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>> Hello,
> >>>>>>> So is this saying, I'd need to somehow get a phone cord with some
> >>>>>>>
> >>>>>>>
> >>> wires
> >>>
> >>>
> >>>>>>> reversed?  I'll try the phone cord that came with the thing. For
> >>>>>>>
> > those
> >
> >>>>>>> curious people among you, here's a recording of what I'm getting.
> >>>>>>> http://www.bluegrasspals.com/2500.wav
> >>>>>>> Jayson.
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>> Jayson,
> >>>>>>
> >>>>>> Are you in a position to measure the off-hook and on-hook voltage
for
> >>>>>> this phone/ATA combination?  (Or have someone else do it for you?)
> >>>>>>
> > It
> >
> >>>>>> would also be interesting to measure the off-hook voltage both with
> >>>>>>
> > and
> >
> >>>>>> without one of the dial keys pressed.  I wonder if the ATA is
putting
> >>>>>> out enough voltage (especially when the phone is off-hook) to run
the
> >>>>>> dial pad.
> >>>>>>
> >>>>>> I seem to recall that when you pressed a key on those old dial pads
> >>>>>>
> > the
> >
> >>>>>> switch contacts somehow generated an electronic "kick" (for want of
a
> >>>>>> better word) to start the oscillator, which then kept going of its
> >>>>>>
> > own
> >
> >>>>>> accord.  I wonder if what you are hearing is this "kick" starting
the
> >>>>>> oscillator for a few cycles, but then the line voltage is not
> >>>>>>
> >>>>>>
> >>> sufficient
> >>>
> >>>
> >>>>>> to keep the oscillator running.
> >>>>>>
> >>>>>> Martin
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>> _______________________________________________
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> >>>>> VoIP at ckts.info
> >>>>> http://lists.ckts.info/mailman/listinfo/voip
> >>>>> Project Web Page: http://www.ckts.info/
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>> _______________________________________________
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> >>>
> >>>
> >>>
> >
> > _______________________________________________
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>