08-26-2008, 12:08 AM
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 Re: TEMPORARILY setting qfe2 to be a DHCP server?
On 2008-08-26, Christopher Noyes wrote:
> Hello,
>
> Just to be clear, were you trying to connect the LAN port of the
> ESP-16 directly to QFE2 on your sun box? Unless you were using an
> ethernet crossover cable this will NOT work.
A good point. I had forgotten about that. Not having his
equipment to hand makes a difference. :-)
> You would have to connect
> the ESP-16 LAN port and the QFE2 port on the sun box to an ethernet
> switch.
To a switch -- or a hub -- or make a crossover cable by crimping
the wires to these pins at the two ends:
End End
1 2
==============================
1<-------------------->3 One twisted pair
2<-------------------->6
3<-------------------->1 Another twisted pair
6<-------------------->2
And -- while you're about it -- if you have four pair cables,
you might as well do the following:
4<-------------------->7
5<-------------------->8
7<-------------------->4
8<-------------------->5
The pin numbers are counted from left to right with the wire
towards you, the clip down and the connector terminal blades up.
But -- of course he has not yet gotten an appropriate crimper,
RJ-45 connectors, and Cat-5 or Cat-6 cable. He needs those to run the
serial ports to all the terminals he has anyway. The alternative is
buying a bunch of pre-made ethernet cables (he has RJ-45 to DB-25
adaptors already -- came with the box.
Hmm ... some short cables came with the box. Perhaps he should
examine them to see whether any one of them is a pre-made crossover. I
would *hope* that if so it is clearly marked -- but look at the colors
of the wires coming to pins 1 and 2 on each end. If they are the same,
it is not a crossover.
You *can* *buy* crossover cables. I have one purchased one, in
pink so I don't accidentally try to use it for normal connections.
> Then you should be able to web to 192.1.1.1. Looking at the
> user manual for that terminal server it also looks like you could
> connect your sun box serial port A (assuming it's free)
From another thread about the same machine, TTYA is dead, and
TTYB is in use (lightning damage which also zapped the built-in hme0
port) on his Ultra-30. The fact that TTYA is dead, and so is the
multi-RS232 card in his linux box is what got this terminal server into
the game.
> to port one of
> the terminal server (while it is not connected to the LAN) and use TIP
> to configure the terminal server. Or use a dec terminal or a wintel
> laptop with an open serial port and use hyperterm.
He does have DEC VT??? terminals -- he used one of them in the
early diagnostics on the Ultra-30. It remains to be seen how many
others of his terminals scattered about the house have survived. I
suggested that he make a loopback DB-25 connector to do a
quick-and-dirty test of the individual terminals not depending on
anything else working -- but his focus was on getting the Ultra-30
working first. :-)
> That looks like a nice little terminal server, BTW.
I should look at that too -- except that I have so few needs for
serial ports these days. Just one on each server machine for a console,
except that I've given each machine a framebuffer connected to a VGA
switchbox, and each has its own keyboard. Less problem with the system
shutting down when you switch terminals because it interprets the
disconnection as a BREAK. :-) Just have to keep the cats off the
keyboards. :-)
Enjoy,
DoN.
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