On Tue, 20 Feb 2001 10:19:34 +1100, da Silva, Joe wrote:
> Lest we confuse ourselves???
> What you are _implying_, inadvertently no doubt, is that a
> modulated analogue connection (ie. from a conventional
> modem) is connected to the cell phone to obtain wireless
> communications.
--------snip---------
NO...I was stating the opposite.....<g>
> all cell phones today, that have data capability, use an
> RS-232 or TTL interface for data connection.
YES....exactly....and the side connected to the PC is designed (at
least in all the "popular standard" models) to look like the RS232 side
of a standard external modem..
> I think, a better way to avoid confusion, is to use the
> RS-232 prefix when talking about RS-232 connections,
> and PSTN (or similar) prefix when talking about the
> RJ11 (or whatever) analogue connection to the wired
YES...we can probably avoid confusion using this terminology
convention.
> telephone system. Incidentally, it doesn't actually matter
> if you cross your (2 wire) PSTN connections - all PSTN
> equipment is [supposed to be] polarity insensitive. Also,
> the modulated signal works the same, regardless of
> phase reversal.
EXACTLY...the PSTN is "balanced to ground"...and the "radio link"
looks similar to the PSTN link......<g g g>
.......gregy
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