Rod, at 09:44 on Feb 22 1996, you wrote to Bill Grimsley...

RS> It is now clear that for some nutty reason the Couriers alone choose to try
RS> for a V32terbo session, immediately after getting a perfect V32bis connect.

BG> That's a totally illogical assumption.

RS> Nope.

Yep.  Have another quote...

=======================================================================
Other V. Protocol Operations

Earlier, lower-speed V. protocols do not employ line probing.  Instead,  
they use predefined answer tones to specify, or identify, speed 
capabilities.  These protocols define the following maximum speeds.

*  V.32 terbo:  19.2K bps, with an additional Courier-to-Courier 
                           speed of 21.6K bps.
*  V.32 bis:    14.4K bps.
*  V.32:        9600 bps.

ASL (used in V.32 terbo and V.32 bis modes) is a strategy that allows 
the modems' receivers and transmitters to act independently of each 
other.  We have always featured a fallback/fall forward feature with 
error-correcting modems that allows them to slow down if there are 
problems with the phone line, in order to avoid data errors, and then 
speed up again.  But the independence of the receiving and transmitting 
channels means that one channel or the other may slow down and then speed 
up, without affecting the data flow on the other.  The result is more 
efficient line operation. 

WARNING:  Answering V.32 terbo modems shift their serial port rate up 
to 38.4K (for 21.6K connections) if the calling V.32 terbo modem dials 
in at 21.6K.  The answering V.32 terbo modem then sends data to its 
computer at 38.4K bps.   V.32 bis modems shift their serial port rate 
to 19.2K bps in order to make 14.4K bps connections.  If your ocomputer 
or terminal does not support these higher serial port rates, you need 
to disable V.32 terbo and/or V.32 bis.  See Appendix B, Register S34.

NOTE:  While many modems on the market now use the more efficient 
speeds, there may be a problem in answering older, "dumb" V.32 
modems at 9600 bps.  Register S28 is used to modify the duration 
of the extra tones used in V.32 negotiations, in the rare instance 
that this may be necessary.  See S-Registers, in Appendix B.
======================================================================

As an aside, it's a pity that Paul no longer has the Courier, as it might
have been worth playing around with S28 as well.

Regards, Bill

--- Msgedsq/2 3.20