Well, FWIW, here in Oz desktops are earthed (class 1), ie. they
are not galvanically isolated.
Joe.
> -----Original Message-----
> From: Jaap van Ganswijk [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, September 19, 2002 11:08 AM
> To: Multiple recipients of list CHIPDIR-L
> Subject: RE: OT: Modems
>
> At 2002-09-18 06:43 -0800, Elbert Smit wrote:
> >> You could try calling: 050-5222263 or 06-0401
> >> (perhaps that's now: 0906-0401?). In any case,
> >> you shouldn't contact a commercial department,
> >> but a technical department.
> >
> >Are these phonenumbers of technical departments?
>
> The first one is the ordering telephone number
> for the book: 'Algemene technische eisen voor
> randapparatuur bestemd voor aansluiting op de
> telecommunicatie-infrastructuur', voor de
> telefoondienst serie T11: Hoofddirectie
> Telecommunicatie en Post (HDTP), Bureau Toelating
> Randapparatuur.
>
> The second one is from 'Account Management
> Infastructuur' (AMIS) and will connect you
> automatically to the department of the PTT
> district you're calling from.
>
> But since these telephone numbers are from the
> book of 1991 they're probably outdated. I
> assumed however that when you would call them,
> the people on the other end of the line would
> be able to tell you more. Even if you would
> just get a receptionist or concierge you could
> ask him to look in the internal telephone
> book, that most large organisations have.
>
> >> Perhaps you could also figure out the maximum level
> >> by studying the ISDN PCM norm, of which the A-Law
> >> version is used in Europe. Consider that 56kbit/s
> >> modems use the 65536 voltage levels of the signal
> >> to code their data.
> >>
> >> We used to detect call-progress states by counting
> >> the number of times that a signal went through the
> >> zero-level, which is quite easy to detect without
> >> having to input and analyze the signal through
> >> an ADC. I should still have the source code.
> >
> >I've used a laptop with soundcard and a high impedance connection to the
> >phonelines to record the modem connections. If you use a sound-edit
> program
> >like Cooledit2000 with a spectral view, you can see DTMF-tones, calling
> >tones, answer tones, measure tone lengths, frequencies, etc.
> >
> >I got this tip from a KPN-technician. Very nice and cheap tool, when you
> >already have a laptop of course ;-)
>
> Does it have to be a laptop? Desktops should also
> be galvanicaly seperated from the mains, I would
> think.
>
-------- snip --------
--
Author: da Silva, Joe
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