Date: Wed, 26 May 1999 11:35:47 +0100 (BST) From: Ian Pallfreeman <ip@albatross.mcc.ac.uk> To: rivers@dignus.com (Thomas David Rivers) Cc: rivers@dignus.com, terry@program-products.co.uk, freebsd-questions@freebsd.org Subject: Re: console terminal server and power loss Message-ID: <199905261035.LAA36678@albatross.mcc.ac.uk> In-Reply-To: <199905251634.MAA07355@lakes.dignus.com> from Thomas David Rivers at "May 25, 1999 12:34:57 pm"
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> I think the difference must be on the Sun side
Sorry for dropping in so late, but I had to get this back from the guy who
makes up my cables.
As an ex-Sun admin I've a (slowly decreasing) pile of Sun boxes which are
attached to a mixture of dumb terminals and both Sun and FreeBSD console
servers. I got this trick somewhere off the net back in the late 80's. It's
mainly to avoid a Sun dropping into the prom when a terminal dies or is
unplugged, but seems to work just as well for hanging a Sun on a console
server.
Sun Box Console Server
2 Tx ------------------------- ------------------------- 2 Tx
\/
/\
3 Rx ------+------------------ ------------------------- 3 Rx
|
Z 4.7K resistor
|
25 -5v ------+ 25 -5v
7 GND ---------------------------------------------------- 7 GND
4 RTS --+ 4 RTS
|
5 CTS --+ 5 CTS
6 DSR --+ 6 DSR
|
20 DTR --+ 20 DTR
YMMV & FWIW,
Ian.
--
Network Unit, SNOT Team, Manchester Computing, The University, Manchester, UK.
mail: ip@mcc.ac.uk | phone: +44-161-275-6006 | fax: +44-161-275-6040
Where once we had dragons to slay, now we just sacrifice chickens.
39,000 users, 622Mb/s networking, and a 486. :-(
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