[odf-discuss] Response to Andy Updegrove's article about the Foundation

[Pete Harlow]

On 08/02/2008, marbux <marbux at gmail.com> wrote:
>
>
>
> On Feb 7, 2008 6:34 AM, <robert_weir at us.ibm.com> wrote:
>
> >
> > odf-discuss-bounces at opendocumentfellowship.com wrote on 02/06/2008
> > 11:40:03 PM:
> >
> > What would be interesting is an examination of standards or technologies
> > that you believe have provided "universal interoperability".  Not
> > necessarily document formats, but something adjacent.  Look at how those
> > standards were made and maintained, what did they do in particular to
> > accomplish their goals.  Point out the best practices, etc.
> >
> >
> Communications protocols would probably be one good area, since
> electronic...
>

<snip>

Of course the original analogue telephone was (is) almost a universal
standard, operating (from memory - I can't find a link just now) on a 48 V
d. c. loop, communicating over a balanced pair at 0dBm and signalling a ring
with around 70 V a. c. Dialling was by loop disconnect pulse around 10 Hz,
gradually replaced by dual tone dialling. The only incompatabilities were
the frequency of the ringing signal, requiring the odd tinkering with a
mechanical a. c. bell to get it to run on a different system, and the mark -
space of the dial pulses.

The first telephone interoperability problem I ever encountered was here in
the office when the analogue system was replaced with a digital one - the
dial presses no longer make a dtmf beep, rendering call centre systems
useless.

Pete.
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