4 Dec
2004
4 Dec
'04
9:43 p.m.
On Dec 5 2004, 11:16, Gordon JC Pearce wrote:
RJ45
Scott Stevens wrote:
> 4. What is the console on this hardware? It has the three serial
> ports on RJ-type connectors, and from what I gather this is a
TTY-only
machine, no
framebuffer, etc.
I made a connector for my DECStation 3100 by grinding bits off an connector until it fitted. Brutal but effective.
Prepare to lose a
few
RJ45s in the process - you'd be better with your
own crimping tool
and a
bag of plugs.
Better still would be the proper DEC connector, but I couldn't find
any
of those.
You can still get them from Farnell in the UK (and presumably in the
States etc) and CPC in the UK. Since I'm sitting here with the Farnell
cat open for Ethan, I looked them up.
Stewart P/No 937-SP-3066R-OST for stranded round cable is Farnell
429-788
Stewart P/No 937-SP-3066-OST for stranded flat/oval cable is Farnell
429-790
Stewart P/No 940-SP-3066R-OST for solid round cable is Farnell 429-843
Stewart P/No 940-SP-3066-OST for solid flat/oval cable is Farnell
429-855
The catalogue numbers are for packs of ten, and they cost UKP4 or so
per pack (quite expensive nowadays).
Of course, the real problem is getting the crimp tool. MMJ tools tend
to be expensive, although if you have one of those multipurpose
crimping pliers with interchangeable dies for blue/red/yellow insulated
connectors, BNCs, RJ45, RJ11, etc you can get MMJ dies for about UKP12.
Better than hacking RJ45s would be to hack RJ11 (6P/6C) plugs. They're
very common, about a quarter of the price of MMJs, and there are
low-cost crimp tools available.
For anyone in the UK who needs *a few*, I believe I still have a box of
adapter cables for Emulex terminal servers. These are short (about
8-10 inches) flat cables with an MMJ on one end and an RJ45 on the
other. You can have a few for the cost of postage.
--
Pete Peter Turnbull
Network Manager
University of York
5 Dec
5 Dec
4:01 a.m.
On Sunday 05 December 2004 06:43, Pete Turnbull wrote:
Better than hacking RJ45s would be to hack RJ11
(6P/6C) plugs.
They're very common, about a quarter of the price of MMJs, and there
are low-cost crimp tools available.
Agreed, the only difference between an RJ12/RJ11 and MMJ is the tab
location, which can be easily sliced off (though that usually makes for
a loose fitting connector).
For anyone in the UK who needs *a few*, I believe I
still have a box
of adapter cables for Emulex terminal servers. These are short
(about 8-10 inches) flat cables with an MMJ on one end and an RJ45 on
the other. You can have a few for the cost of postage.
And if anyone in the US wants one, I can do up to, say, 25ft MMJ->MMJ or
MMJ->RJ(12/45) cables for $5 + shipping. I had a few takers last time
I did this, and they seemed to be happy with my handiwork. : )
Pat
--
Purdue University ITAP/RCS --- http://www.itap.purdue.edu/rcs/
The Computer Refuge --- http://computer-refuge.org
8:48 a.m.
On Sun, 5 Dec 2004 13:01:29 -0500, Pat wrote:
On Sunday 05 December 2004 06:43, Pete Turnbull wrote:
If you made something like this, would the RJ-45 end plug into one of
the serial adaptors that I got from the back of a rackmount US
Robotics modem box? It's one of those plugs that adapts from RJ-45
jack to a DB-25 male plug.
If so, it would be great to get one of those. I'd do it myself, but I
literally have to look across a room completely stuffed with boxes of
junk to see my electronics bench. I really _really_ need to clean
things up.
I'm way out of it as far as serial interfaces and interface standards,
cable pinouts, etc. I null-modem into Sun boxes to install Solaris
and NetBSD over a serial console, and talk to my HP 95LX over a little
serial cable, but it's been ages since I tackled it much further. But
in the last month I've acquired two serial-console only machines.
(the MicroVAX, and an Altos 586 Xenix box (8086 Xenix in 512K of
RAM)). I'm so out of it as far as serial goes that I struggled for
half a day with the serial interface to the Altos box before I
realized 'hey, I should NOT be using a Null-modem cable to connect a
Linux box running Minicom to the Altos console. This is the REAL
THING, not terminal-to-terminal.' Could be it's time to design and
build up a 'serial switchbox/crossbar/multiplexer.' That would be a
cool app for a mid-sized PIC controller and some of those 6402s I have
lying around. Hmmm... A 'serial hub' to connect it all together...
I'm interested in one of those cables, Pat. To accelerate my getting
that MicroVAX online. I located a SCSI CDROM for it yesterday from my
hoard that has jumpers on the back labeled 'parity' and 'block size'
so I think it's all coming together.
Scott
Better than hacking RJ45s would be to hack RJ11
(6P/6C) plugs.
They're very common, about a quarter of the price of MMJs, and there
are low-cost crimp tools available.
Agreed, the only difference between an RJ12/RJ11 and MMJ is the tab
location, which can be easily sliced off (though that usually makes for
a loose fitting connector).
For anyone in the UK who needs *a few*, I believe
I still have a box
of adapter cables for Emulex terminal servers. These are short
(about 8-10 inches) flat cables with an MMJ on one end and an RJ45 on
the other. You can have a few for the cost of postage.
And if anyone in the US wants one, I can do up to, say, 25ft MMJ->MMJ or
MMJ->RJ(12/45) cables for $5 + shipping. I had a few takers last time
I did this, and they seemed to be happy with my handiwork. : )
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days inactive
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chenmel＠earthlink.net -
pat＠computer-refuge.org -
pete＠dunnington.u-net.com