🚀 go-pugleaf

We have a cisco terminal server with CSC3 processor and software version
8.2(5). US Robotics modems are connected to the server.
I connect to the modems with a modem connected to a PC.
Hardware flow control is used in both ends. The modems use
error correcting v.42 protocol. When I transfer large files from the pc
to a mainframe, I get in average one retry in 100 kilobytes. If I transfer
files to the pc, I get no retries.

I tried this with two different brands of modems connected to the PC
(Supra and US Robotics v.32bis), three different connection rates (4800, 9600
and 14400 b/s), several modems connected to the terminal server
(US Robotics v.32 with DTE speed 19200 b/s and USR v.32bis with DTE speed
38400 b/s), three different mainframes
(low load in all of them) and two different protocols,
kermit (mskermit and c-kermit) and zmodem (dsz.exe and sz/rz).

The quality of the phone connection is good, because I tried once to
download a 500 kB file to the pc with the error correction of the modems
switched off and got no retries.

When I tried to transfer files between the two PC:s with the Supra modem
connected to one and USR v.32bis to the other, I got no retries.

Does the cisco terminal server lose characters when I upload files through it?
What should we do to correct the problem?

-Petri Kaukasoina