On Sep 01 16:04 96, Charles Yendle of 3:711/948 wrote:

>> CY> It is a 'FACT' that on DTE Speed 'BAUD=BPS'
>>
>> Charles - DTE does not HAVE a baud.  There is no signal being
>> transitioned from one analog state to another - the DTE is NRZ direct
>> digital data.  That's what RS232 and its cousins do for a living -
>> they do NOT talk to phone lines.  (If they did, we wouldn't need to
>> buy modems, right?)

CY> I think you are incorrect here. A RS232 Cable DOES have two Analogue 
CY> States. It uses -12 volts for Logical '1' and +12 Volts for Logical '0'.

These aren't analogue, Charles.  Matter of fact, they're defined at a
clipping level of around 1.5 volts either way, with a forbidden zone in the
middle.

Pure digital information, with not a scrap of level or phase information encoded.

CY> Noware in the definition of BAUD does it say it ONLY applies to Carrier 
CY> Signals. It would apply to ANY Signal that changes Physical States.

Since a baud refers to the carrier cycles, not to the signal encodings, it
has to apply to carrier signals.

CY> And an RS232 signal certainly has 2 Physical States.

It does indeed.  If rated as a signal, it might have a baud rate - if it
weren't for the fact that it's NRZ.  A constant stream of either ones or
zeros doesn't change at all.

Pop into AUSTMODEM - we can continue the tutorial there.

Regards,
Dave Hatch.

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