davea@kgw2.bwi.WEC.COM (Dave Alverson) (05/04/90)
In article <2371@network.ucsd.edu>, barry@network.ucsd.edu (Barry Brown) writes: > About four months ago I acquired a Practical Peripherals PM2400SA MNP-5 > modem. It works great, except for file transfers... Barry, First, I assume you have "locked" the interface between the modem and your Mac at a higher speed (4800 or 9600). For problems downloading to your Mac, it is most likely a flow control problem in the OTHER machine. (The sending modem is the bottleneck.) On a Sun machine here, I had to do a 'stty crtscts' to get the Sun to use HW handshake. If you can't correct the flow control, you can sometimes get around it by using a windowed protocol. For sending files with zmodem from a Unix machine, you can 'sz -w 2048 file'. You can try different window sizes to find whats best. For zmodem uploading with ZTerm, you can specify a window size in the ZModem Parms dialog. Again, 2048 is a good first guess for this kind of problem. > serial port; no flow control on the modem port; and to "process and > pass X-ON/X-OFF characters". To me, "process" would mean to stop sending when an xoff was received. I don't think you want this; you just want xon/xoff to be passed thru. -- Dave ps. I tried to reply to your mail some months ago, but it bounced. -- Z Dave Alverson, Cincinnati & Mason, Ohio Z Address: davea@kgw2.bwi.WEC.COM