newton@csvax.caltech.edu (Mike Newton) (03/23/89)
francis%catuc.UUCP@arizona.edu writes: >I am trying to decide if the Telebit Trailblazer Plus can work with our >Sun 386i at the speed of 19,200 bps.... Well, yes and no. My advise is to sell you 386 and start over, but if that is not an option, it will work somewhat. Many _hours_ (and that isnt cheap from here!) of conversations with sun have come up with the following things: [1] 4.0.1 is a hell of a lot better than 4.0.0 for fast speed. [2] The console and the modem (ttya) are not compatible even when the modem is only delivering 5000 baud (best we can do because of satelites). [3] UUCP has a bug which will cause it not to hang up sometimes (OUCH! $$$$) [4] The one competent engineer at sun (who shall remain nameless for his protection) has tried ALOT to help us. More details on #2: The sun386i is so brain dead that the ~ 450 char.s per second that we get off of our trailblazer can not be even partially taken in when the screen is refreshing. In particular typing cat /etc/termcap will reduce the flow to a few (3?) characters per second. Thus, the IO bandwidth is not there on a 386i. Secondly, during the 'cat /etc/termcap', sooner or latter part of a uucp packet will be lost. This will cause uucp to hang. Once in a while it will forget (forever) to hang up. Our solution to these problems: [1] Run uucp late at night when no one want to use the sun [2] Have a 'cron' job that runs about an hour after each uucp conversation to the mainland that forcibly hangs up the modem: # UUCP insurance: 55 7 * * * stty 0 -hupcl > /dev/cua 10 8 * * * rm /usr/spool/uucp/STST\* /usr/spool/uucp/LCK..c\* 30 12 * * 0,6 stty 0 -hupcl > /dev/cua 45 12 * * 0,6 rm /usr/spool/uucp/STST\* /usr/spool/uucp/LCK..c\* (and several more entries like these!) Anyway, hope this helps. My sympathies to you for having such a machine. - mike Mike Newton newton@csvax.caltech.edu Caltech Submillimeter Observatory kahuna!newton@csvax.caltech.edu Post Office Box 4339 Hilo Hawaii 96720 808 935 1909