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From: Ben Stuyts <benst@terminus.stuyts.nl>
Date: Mon, 10 Feb 97 23:40:22 +0100
To: questions@freebsd.org
Subject: uucp errors after upgrading ZyXEL modem to ISDN
Reply-To: ben@stuyts.nl
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Dear net,

I have upgraded my ZyXEL Elite modem to ISDN. Since then I have been having  
intermittent problems with uucp sessions: sometimes packets arrive with bad  
checksums or out of order. Sometimes whole sessions go without any problem.

I only see this problem with high-speed ISDN connections. There are no  
problems with V34 (max 28.8k) connections. It looks like a handshake problem,  
but it isn't. I have checked both the lights on the front panel of the modem,  
and with a small rs232 tester. RTS goes off and on. The modem is configured  
for rts/cts handshaking. I am using the i protocol with default 1024/16  
windows. There are no sio overflow errors in the console.

I am running freebsd 2.2 gamma up to ctm 148. The machine has a Pentium 166  
on a Gigabyte 586DX motherboard, and I am using the built-in serial ports.  
(cuaa0 in this case.) I have set up /etc/rc.serial to init port 0 as a modem  
port. Port speed is set to 115200. The ZyXEL's firmware is v2.04.

When I try to ftp a large file, using ppp over this same modem, and to the  
same provider, I get no errors. (At least, the transfer rate is what it should  
be, and netstat -i shows no errors.)

Any ideas?

Thanks,
Ben