norton@manta.NOSC.MIL (LT Scott A. Norton, USN) (05/29/91)
I am currently accessing a Unix system (manta.NOSC.MIL) over a TAC on MILNET. I have been able to get Kermit to work (the TAC eats "@", but that can be changed to a character that Kermit doesn't use, like ^B). But because the TAC has a few seconds of latency, the acknowledgments for each packet slow things down, from 1200 baud to less than 300 throughput. I have a fairly old Wecker VT100 (v2.4, I think -- I'm typing away from my Amiga), that supports Kermit and XMODEM. The far end (manta) has C-kermit and XMODEM. Neither of the kermits support extended packets or windowed protocol, and I can't get XMODEM to work at all. XMODEM seems to time out due to the TAC latency. Can anyone give me some hints to improve my throughput? I can see I'll probably need to upgrade my terminal emulator on the Amiga end, and get a matching protocol on the Unix site. FTP-able solutions are prefered. BTW, the Unix site is BSD, and the Amiga is a 2000 with 20M HD, 2.5 meg, and a 2400 baud modem, (but the TAC only has 1200 baud ports) Scott Norton <norton@NOSC.MIL>
jsanchez@polari.UUCP (jim sanchez) (05/30/91)
I would suggest that you get a copy of VLT and the xprkermit.library from someone and then ftp a copy of one of the newer c-kermits from columbia. You can then compile it on your host system and have 1000 byte packet support. That REALLY speeds things up on a packet switched network like the milnet. Forget trying to use XMODEM from a TAC not because of delay/latency but because it is an ascii box ditto for zmodem. I do not have the complete address for columbia but if you look at comp.protocols.kermit they should tell you. the xprkermit.libray has the actual kermit protocol implementation in it and vlt will not work without it. I use a similiar setup all the time when I call our vax across our terminal servers. Good luck -- Jim Sanchez jim@hls.com Hughes LAN Systems - Bellevue, WA (206)646-4999
Jon_Wolf@amicol.UUCP (Jon Wolf) (06/06/91)
>I have a fairly old Wecker VT100 (v2.4, I think -- I'm typing away >from my Amiga), that supports Kermit and XMODEM. The far end (manta) >has C-kermit and XMODEM. Neither of the kermits support extended >packets or windowed protocol, and I can't get XMODEM to work at all. >XMODEM seems to time out due to the TAC latency. >Can anyone give me some hints to improve my throughput? I >can see I'll probably need to upgrade my terminal emulator >on the Amiga end, and get a matching protocol on the Unix site. >FTP-able solutions are prefered. BTW, the Unix site is BSD, and >the Amiga is a 2000 with 20M HD, 2.5 meg, and a 2400 baud modem, (but >the TAC only has 1200 baud ports) >Scott Norton <norton@NOSC.MIL> If you can find the source code to SZ/RZ, then you can run Zmodem to do your binary transfers between your Amiga & Unix system. All you'd have to do with the source code is to recompile it (unless you can find already compiled binaries that will work on your version of Unix). SZ/RZ might even be on the Unix system your calling. At your shell prompt, just type SZ or RZ and see if it works. -- Via DLG Pro v0.97b ___ _ __ _ ( ) ' ) / // /) __/________ / / / __|/ // / / (_) /) )_ (_(_/ (_) \_//_ (_/ /> </