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From: k2@charly.bl.physik.tu-muenchen.de (Klaus Steinberger)
Newsgroups: comp.sys.mips
Subject: Re: login and syslog question.
Message-ID: <4049@tuminfo1.lan.informatik.tu-muenchen.dbp.de>
Date: 20 Aug 90 14:38:05 GMT
References: <24581@boulder.Colorado.EDU> <905@hadron.COM>
Sender: news@lan.informatik.tu-muenchen.dbp.de
Lines: 33

jsdy@hadron.COM (Joseph S. D. Yao) writes:

>In article <24581@boulder.Colorado.EDU> hartzell@beagle (George Hartzell) writes:
>>I have two related problems/questions.  ...
>>	   ...  I have 48 serial lines strung out through a large
>>building (almost certainly out of rs232 spec).  ...
>>turned off login/getty tries to log in "people" with names like
>>"mkmkk[m[".  ...

>Tying a resistor across two leads of an EIA RS-232 serial line is a
>very bad idea.  Your EE friends know about "ringing" and things that I
>don't really understand, but they don't know the EIA standard.
Yeah, but it works, we use that on our old DEC10, there we have
similar problems. (10k from send to gnd, and receive to gnd)

>Your best fix is to use cables that tie the DTR (Data Terminal Ready)
>lead of your remote terminal or terminal emulator to the DSR (Data Set
>Ready) lead of your serial port.  Then tell your serial board (if you
>can) that this is a "modem" port, and so should be ignored while the
>DSR lead is not on.  Many people figure they are winning by tying
That's nice, but impossible most time, because many wirings in the buildings
don't have enough wires.

Best solution on the long term, I think is to eliminate all those
long EIA lines by locally placed Terminalservers. In our installation
most of those long lines will go away through servers, and through
replacement by PC's and X-Terminals (directly tied to the ethernet).

Sincerely,
Klaus Steinberger
Klaus Steinberger               Beschleunigerlabor der TU und LMU Muenchen
Phone: (+49 89)3209 4287        Hochschulgelaende, D-8046 Garching, West Germany
BITNET:  K2@DGABLG5P            Internet: k2@charly.bl.physik.tu-muenchen.de