Hamish, at 11:03 on Dec 06 1996, you wrote to John Piper...

HM> This sounds like it could be a problem Paul Edwards noticed 
HM> a few months back. After a reset with ATZ, the modem reverts 
HM> to whatever port speed was used to write the profile, rather 
HM> than whatever speed was used to issue the ATZ. If you wrote 
HM> the profile at a different speed, and your init string was 
HM> just ATZ in FrontDoor, the modem would change its speed to 
HM> that other speed and give you garbage RINGs.

To be fair, a bit rate mismatch will ONLY ever affect an incoming RING, and
as the Courier will "autobaud" on any AT command, it doesn't
cause problems with outbound calls.  The problem is that with ATZ, whilst
AT "autobauds" to the terminals stored bit rate, the subsequent Z
immediately restores the modem's stored bit rate (as indicated with ATI4). 
This is documented in the manual, but not particularly clearly IMO.

HM> FWIW, I can confirm that my Supra does not have this problem. :-) I just 
HM> wrote the profile at 57.6k, then issued an ATZ at 9600, and called the 
HM> line; RING came out correctly.

True, Rockwells do not suffer from this "anomaly" (I won't call
it a bug, as USR themselves maintain that their modems were actually
designed that way).

Regards, Bill

--- MsgedSQ/2 3.50