trent@cit-vax.Caltech.Edu (Ray Trent) (11/21/86)
Speaking of the DMD5620 (which I think is a good terminak even though we don't have the layers software running), does anyone out there have layers running over an Ethernet LAN? We have this stupid arrangement of Ungerman-Bass NIUs as terminak concentraters linked by EtherStrands. The problem (as I understand it... I haven't hacked on this too much) is that the xt driver used by layers et al is assumed to have hardware flow control. Is there a way to get around this requirement? (We're working on getting a few HFC lines working, but it would be nice if there was some way to use software/no flow control instead) -- "A journey of a thousand miles..." ../ray\.. (trent@csvax.caltech.edu, rat@caltech.bitnet, ...seismo!cit-vax!trent)
gwyn@brl-smoke.ARPA (Doug Gwyn ) (11/22/86)
In article <1219@cit-vax.Caltech.Edu> trent@cit-vax.UUCP (Ray Trent) writes: >We have this stupid arrangement of Ungerman-Bass NIUs as terminak >concentraters linked by EtherStrands. The problem (as I understand it... >I haven't hacked on this too much) is that the xt driver used by >layers et al is assumed to have hardware flow control. Is there a >way to get around this requirement? Layers mode terminal<->host communication is done using an error-correcting packet protocol; neither DC3/DC1 nor hardware handshaking is required. Some LANs, perhaps including yours (with which I am not familiar), do not support full 8-bit transparency. If that is the problem, then you should use the special "encoding" kludge. For DMD firmware rev 2.0 (8;7;5), this can be enabled using the Set-Up Host Options menu. Older DMDs can be used with encoding by setting DMDLOAD=hex in one's environment. More information on this is given in the 5620 DMD Rel. 2.0 Administrator Guide, AT&T select code 306-141.
kludge@gitpyr.gatech.EDU (Scott Dorsey) (11/24/86)
In article <1219@cit-vax.Caltech.Edu> trent@cit-vax.UUCP (Ray Trent) writes: >Speaking of the DMD5620 (which I think is a good terminak even though >we don't have the layers software running), does anyone out there >have layers running over an Ethernet LAN? Sounds familiar. If you disable flow control on the NIU's, it seems to work at slower baud rates, as long as you do not overflow the NIU buffer. With xon/xoff set, the flow control chars are used as real control stuff, causing strange things to happen. Hardware flow control is the only reasonable way to go about things. Also, if you have the newer U/B 180 NIU's, you might find yourself in a deeper hole than you think. layers doesn't seem to work properly on the 180, for reasons I am not quite sure of. But I am sure someone more knowlegeable can answer it for me (please!). -- Scott Dorsey Kaptain_Kludge ICS Programming Lab (Where old terminals go to die), Rich 110, Georgia Institute of Technology, Box 36681, Atlanta, Georgia 30332 ...!{akgua,allegra,amd,hplabs,ihnp4,seismo,ut-ngp}!gatech!gitpyr!kludge