On Mar 13, 1997 at 09:27 hrs, Andrew Strong of 3:713/319 wrote to ALL:

Hello Andrew,

 AS> The modem is a Creative Labs Modem Blaster 33.6 External on Com1.
 AS> It is setup as a "Creative Labs 28.8-33.6 PnP Modem" under Win 95.

 AS> It works flawlessly to connect to my ISP using DUN. Throughput is
 AS> 3000 to 3500 cps on a good night, never drops carrier, solid 33.6
 AS> connect etc. But I am having trouble connecting to local BBSs.

 AS> Connects well and downloads well but uploading files can be very
 AS> difficult. Using Hyperterminal the upload can slow to nothing and
 AS> sometimes freeze, the other side reports CRC errors. Hyperterminal
 AS> reports "Bad Data Packet" and "Retries" can be
20 for a 1meg file.
 AS> At times the Error Correction LED flashes like crazy!!!

This is typical of flow control problems.  

Downloading is fine because the port is set higher than the fastest rate
the incoming data speed so no congestion.  

When you try uploading the reverse is now true - the port can pump data
into the modem faster than the modem can send it down the line  and
over-runs occur unless flow control is working.  Flow control stops data
being sent to the modem when the modem's buffer fills and allows data flow
again when the buffer empties.

Solution.  Check that cts/rts flow control is enabled in BOTH modem and
terminal program.  Once it is enabled you should not see this problem
again.

Regards ... John
@EOT:

--- MsgedSQ/2 3.30