D. Allen [CGL]) (09/11/90)
Anyone have a shared modem line working under Ultrix, say 3.1 or 3.1C, via reverse LAT to a DS200/MC terminal server with attached modem? My getty keeps opening the line and engaging in a shouting match with my modem and it thus won't let me tip to the modem. Getty should *not* open the line until a call comes in; it has to leave the line clear so I can call out on it. If this keeps up, I'll have to buy a Qbus serial card for my DS5400. Or maybe I'll put the modems on our MicrovaxII; it has a serial card. I thought terminal servers were supposed to be wonderful?
grr@cbmvax.commodore.com (George Robbins) (09/11/90)
In article <9009110234.AA18245@watcgl.waterloo.edu> idallen@watcgl.uwaterloo.ca (Ian! D. Allen [CGL]) writes: > Anyone have a shared modem line working under Ultrix, say 3.1 or 3.1C, > via reverse LAT to a DS200/MC terminal server with attached modem? My > getty keeps opening the line and engaging in a shouting match with my > modem and it thus won't let me tip to the modem. Getty should *not* open > the line until a call comes in; it has to leave the line clear so I > can call out on it. I'd make sure that the modem is set up so that it doesn't make with carrier detect/data set ready until an incoming call is in progress and that the terminal server has appropriate modem control settings. Even so, I'm not sure you can get it to work - terminal servers put lots of code where once simple wire was, and truely transparent it ain't. > If this keeps up, I'll have to buy a Qbus serial card for my DS5400. > Or maybe I'll put the modems on our MicrovaxII; it has a serial card. Might not be a bad idea, if you're trying to use fast modems you may run into thruput/buffering problems or other irritations. > I thought terminal servers were supposed to be wonderful? B.S. -- George Robbins - now working for, uucp: {uunet|pyramid|rutgers}!cbmvax!grr but no way officially representing: domain: grr@cbmvax.commodore.com Commodore, Engineering Department phone: 215-431-9349 (only by moonlite)
thomas@mipsbx.lkg.dec.com (Matt Thomas) (09/14/90)
In article <9009110234.AA18245@watcgl.waterloo.edu> idallen@watcgl.uwaterloo.ca (Ian! D. Allen [CGL]) writes: >Anyone have a shared modem line working under Ultrix, say 3.1 or 3.1C, >via reverse LAT to a DS200/MC terminal server with attached modem? My >getty keeps opening the line and engaging in a shouting match with my >modem and it thus won't let me tip to the modem. Getty should *not* open >the line until a call comes in; it has to leave the line clear so I >can call out on it. But _init_ doesn't know when a call came in so it doesn't know when to fork/exec a getty. I wish it did if you do it for LAT, then you'll want to do it for every other terminal device. But it doesn't, so it has to start a getty on that line. But that is set for outgoing calls too. Which means the getty starts up and connect to DS200 and the modem just like you were dialing out (since LAT doesn't know the difference). You can consider LAT to a terminal with nomodem control and that the cable is cut when the user is finished. (A new cable is strung when the next user logs in). Since shared is only supported on ttys with full modem-control, it won't work on LAT. >If this keeps up, I'll have to buy a Qbus serial card for my DS5400. >Or maybe I'll put the modems on our MicrovaxII; it has a serial card. I think the DHQ11 is supported. >I thought terminal servers were supposed to be wonderful? Only for some things. Note that if you were going to run UUCP or some other program and has a lot of input, then you really want a local device as it respond faster to flow control. Note that if it possible, configure for hardware flow control on the port. Matt Thomas Internet: thomas@wrl.dec.com DECnet-ULTRIX Development UUCP: ...!decwrl!thomas Digital Equipment Corporation Disclaimer: This message reflects my own Littleton, MA warped views, etc.
D. Allen [CGL]) (09/15/90)
>You can consider LAT to a terminal with nomodem control and that the cable >is cut when the user is finished. (A new cable is strung when the next user >logs in). Since shared is only supported on ttys with full modem-control, >it won't work on LAT. Wot? You mean I bought three DS200/MC units with modem control and the modem signals are not propagated back to the Ultrix ttys? What's the point of modem control on the DS200 then? -- -IAN! (Ian! D. Allen) idallen@watcgl.uwaterloo.ca idallen@watcgl.waterloo.edu [129.97.128.64] Computer Graphics Lab/University of Waterloo/Ontario/Canada
jv@mh.nl (Johan Vromans) (09/15/90)
In article <1990Sep15.053123.21371@watcgl.waterloo.edu> idallen@watcgl.waterloo.edu (Ian! D. Allen [CGL]) writes: Wot? You mean I bought three DS200/MC units with modem control and the modem signals are not propagated back to the Ultrix ttys? What's the point of modem control on the DS200 then? I agree, Ian, this is ridiculous! Also, in article <15364@shlump.nac.dec.com> thomas@mipsbx.lkg.dec.com (Matt Thomas) writes (in reply to Ian): Ian> If this keeps up, I'll have to buy a Qbus serial card for my DS5400. Ian> Or maybe I'll put the modems on our MicrovaxII; it has a serial card. I think the DHQ11 is supported. DEC advised me to buy a DS5000 instead of a DS5400 (which I did). And a 5000 does not have anything alike a DHQ11. I feel disappointed. Johan [The above opinions are my own, but I think it won't cost much effort to make my boss share them.] -- Johan Vromans jv@mh.nl via internet backbones Multihouse Automatisering bv uucp: ..!{uunet,hp4nl}!mh.nl!jv Doesburgweg 7, 2803 PL Gouda, The Netherlands phone/fax: +31 1820 62911/62500 ------------------------ "Arms are made for hugging" -------------------------
grr@cbmvax.commodore.com (George Robbins) (09/16/90)
In article <1990Sep15.053123.21371@watcgl.waterloo.edu> idallen@watcgl.waterloo.edu (Ian! D. Allen [CGL]) writes: > >You can consider LAT to a terminal with nomodem control and that the cable > >is cut when the user is finished. (A new cable is strung when the next user > >logs in). Since shared is only supported on ttys with full modem-control, > >it won't work on LAT. > > Wot? You mean I bought three DS200/MC units with modem control and > the modem signals are not propagated back to the Ultrix ttys? What's > the point of modem control on the DS200 then? Basic modem control *is* supported, i.e. CD to detect hangups and probably DSR to enable/disable answer, but that doesn't mean the emulation is good enough to support the Ultrix flavor of shared modem support (though it might work). You may also have problems with things like "send break" or having to hit return to establish an incoming connection, which may or may not be a problem for your intended use. -- George Robbins - now working for, uucp: {uunet|pyramid|rutgers}!cbmvax!grr but no way officially representing: domain: grr@cbmvax.commodore.com Commodore, Engineering Department phone: 215-431-9349 (only by moonlite)
thomas@mipsbx.lkg.dec.com (Matt Thomas) (09/16/90)
In article <1990Sep15.053123.21371@watcgl.waterloo.edu> idallen@watcgl.waterloo.edu (Ian! D. Allen [CGL]) writes: >>You can consider LAT to a terminal with nomodem control and that the cable >>is cut when the user is finished. (A new cable is strung when the next user >>logs in). Since shared is only supported on ttys with full modem-control, >>it won't work on LAT. > >Wot? You mean I bought three DS200/MC units with modem control and >the modem signals are not propagated back to the Ultrix ttys? What's >the point of modem control on the DS200 then? Such that when the user logs off, the DECserver detects the change and kills all of his sessions. Or so that you can do hardware (CTS/RTS or DSR/DTR) flow control. Under LAT, modem control signals are not communicated up to the host. They are dealt with entirely by the terminal server (with the end result being propogated to the host -- if needed). Matt Thomas Internet: thomas@wrl.dec.com DECnet-ULTRIX Development UUCP: ...!decwrl!thomas Digital Equipment Corporation Disclaimer: This message reflects my own Littleton, MA warped views, etc.