Tony, at 14:50 on Mar 12 1996, you wrote to Arthur Marsh...

AM> Can you try forcing V.34 at a lower speed e.g. 14400 bps?

TM> does this mean that V.34 14400 bps is different to V.32bis 14400 bps?

Yep, it sure is.  Whilst the following has been imported from the Courier
manual, it nonetheless applies equally to all V.34 modems...

=================================================================

Appendix K--Technical Specifications
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

V.34
~~~~
   28.8K, 26.4K, 24K, 21.6K, 19.2K, 16.8K, 14.4K, 12K, 9600, 7200, 
   4800, and 2400 bps asynch Trellis Coded Modulation (TCM)

V.Fast Class (V.FC)
~~~~~~~~~~~~~~~~~~~
   28.8K, 26.4K, 24K, 21.6K, 19.2K, 16.8K, 14.4K bps asynch Trellis 
   Coded Modulation (TCM)

U.S. Robotics V.32 terbo 
~~~~~~~~~~~~~~~~~~~~~~~~
   21.6K, 19.2K, 16.8K, 14.4K. 12K, 9600, 7200 bps asynchronous, 19.2K, 
   16.8K, 14.4K. 12K, 9600, 7200 bps synchronous, Trellis Coded 
   Modulation (TCM)

   4800 bps, synch/asynch, Quadrature Amplitude Modulation (QAM) 

U.S. Robotics High Speed Technology (HST)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   16.8K, 14.4K, 12K, 9600, 7200 bps, asynchronous, asymmetrical, 
   450 bps back channel with automatic handshake adjustment to 300 bps, 
   Trellis Coded Modulation (TCM), Quadrature Amplitude Modulation (QAM) 

   4800 bps, asynchronous, asymmetrical, 450 bps back channel with 
   automatic handshake adjustment to 300 bps, Quadrature Amplitude 
   Modulation (QAM)

ITU-T V.32 bis
~~~~~~~~~~~~~~
   14.4K. 12K, 9600, 7200 bps, synch/asynch, Trellis (TCM)

   4800 bps, synch/asynch, Quadrature Amplitude Modulation (QAM) 

Additional Compatibility Features
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   ITU-T V.32, 9600 bps, synch, asynch, Trellis Coded Modulation (TCM); 
   4800 bps, synch, asynch, Quadrature Amplitude Modulation (QAM)

   ITU-T V.25 2100 Hz tone

   ITU-T V.23, 1200 bps, asymmetrical (1200/75 bps), (FSK)

   ITU-T V.22 bis, 2400 bps, synch/asynch, (QAM) 

   ITU-T V.22, 1200 bps, synch/asynch, Differential Phase 
   Shift Keying (DPSK)

   Bell 212A, 1200 bps, synch/asynch, Differential Phase Shift 
   Keying (DPSK)

   Bell 103, 300 bps, asynch, Frequency Shift Keying (FSK)

   ITU-T V.21, 300 bps, asynch, Frequency Shift Keying (FSK)

================================================================

Regards, Bill

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