keith@expo.lcs.mit.edu (Keith Packard) (12/09/88)
expo.lcs.mit.edu is a sun 3/280 that I need to install several Telebit Trailblazers on, for uucp and other file-transfer protocols. I'm curious as to where I can get serial boards which will support hardware flow control for these modems, I've heard rumors that the standard sun serial boards don't handle it correctly. Without hardware flow control, the Telebits will perform terribly. Thanks, Keith Packard MIT X Consortium (617) 253-1428 keith@EXPO.LCS.MIT.EDU
asg@space.mit.edu (Sergei A. Gourevitch) (12/20/88)
You DON'T need hardware flow control with the telebits if you are running one of their supported protocols such as uucp or kermit. The modem uses its protocol "spoofing" for flow control. my default configuration includes:(interface is locked at 19200 baud) s111 = 255 Use other modem's protocol S68 = 255 Use flow control specified in S58 S58 = 0 No flow control My uucp dialing sequence sets" s111 = 30 uucp protocol s52 = 2 do a reset on loss of DTR s54 = 2 immediate break s110 = 1 enable data compression I do something similiar with kermit. Telebit to telebit uucp transfers run at > 1200 bytes/second. The only problem is using tip or kermit in "conversational" or "terminal" mode. If you list a lot on the far end, it gets garbled. I wish the modem had a switch which said "use whatever flow control the other telebit uses" so I could turn on XON/XOFF flow control. In principle, I should be able to remotely program the other end to accomplish the same thing but I haven't been able to do that conveniently. Yes, hardware flow control would solve the problem, and would be the best solution. The modems perform "terribly" with slip.