14 Jun
2002
14 Jun
'02
2:53 a.m.
F.Y.I. - My Cabletron MRXI hubs have RJ-45 sockets,
for hooking up
to a serial VT420 terminal... :)
But, yes, I agree. Those hubs are the only time _I've_ seen RJ-45
used for serial communication.
Various terminal servers use RJ45 for serial
comms. One of the selling points of CAT5 was
that you wire your building once with CAT5 and
then can use the same wires for voice and data.
The data was usually either ethernet traffic
or serial comms (for printers and such). The
connectors were invariably (at least in my experince)
RJ45 for both ethernet and serial (and ISDN too).
Antonio
14 Jun
14 Jun
4:12 a.m.
Its quite common....
Nearly all of the Cisco equipment have RJ45 console ports on them, even
Radio shack sells DB25/RJ45 hook kits for making connectors. I just
recently picked up a Synoptics 28115 switch for my in-home network (I wanted
one as it was the first switch I had ever installed back in 1994) and it too
has a standard RJ45 console port on it. The great thing about the
console ports on most devices is that they use standard straight run CAT5
cables so you don't have to make up a custom one.
Curt
----- Original Message -----
From: "Antonio Carlini" <Antonio.Carlini(a)riverstonenet.com>
To: <cctalk(a)classiccmp.org>
Sent: Friday, June 14, 2002 10:53 AM
Subject: RE: Network card for LaserJet
F.Y.I. - My
Cabletron MRXI hubs have RJ-45 sockets, for hooking up
to a serial VT420 terminal... :)
But, yes, I agree. Those hubs are the only time _I've_ seen RJ-45
used for serial communication.
Various terminal servers use RJ45 for serial
comms. One of the selling points of CAT5 was
that you wire your building once with CAT5 and
then can use the same wires for voice and data.
The data was usually either ethernet traffic
or serial comms (for printers and such). The
connectors were invariably (at least in my experince)
RJ45 for both ethernet and serial (and ISDN too).
Antonio 
4:20 a.m.
At 12:12 PM 6/14/2002 -0400, Curt Vendel wrote:
Nearly all of the Cisco equipment have RJ45 console
ports on them, even
Radio shack sells DB25/RJ45 hook kits for making connectors.
The great thing about the
console ports on most devices is that they use standard straight run CAT5
cables so you don't have to make up a custom one.
And if you're out junk hunting or raiding someone else's junk
closet, you might find a pile of the 9-pin and 25-pin to RJ-45
adapters that Cisco includes when you buy a router with a
console port. I hadn't thought about it that way, but is
this a handy source of alternatives to long serial cables?
If I use a cross-over cable, it is wired like a null modem?
- John
5:15 a.m.
John....
Oh yeah, tons and tons of the DB9 to DB25 connectors using the flat
silk type cablings (light blue and black) or standard RJ45.... I don't
think the cross over cables for CAT5 would apply like a null-modem cable
though, you'd need to check the wiring in the hoods.... the cross overs
reverse cat5 like this:
Straight Xover
1 Org/Wht Grn/Wht
2 Orange Green
3 Grn/Wht Org/Wht
4 Blue Blue
5 Blue/Wht Blue/Wht
6 Green Orange
7 Brown/Wht Brown/Wht
8 Brown Brown
So in the x-over cable what you are doing is switching 1&2 for 3&6 and
vice-versa
Curt
----- Original Message -----
From: "John Foust" <jfoust(a)threedee.com>
To: <cctalk(a)classiccmp.org>
Sent: Friday, June 14, 2002 12:20 PM
Subject: Re: Network card for LaserJet
At 12:12 PM 6/14/2002 -0400, Curt Vendel wrote:
> Nearly all of the Cisco equipment have RJ45 console ports on them,
even
Radio shack
sells DB25/RJ45 hook kits for making connectors.
The great thing about the
console ports on most devices is that they use standard straight run CAT5
cables so you don't have to make up a custom one.
And if you're out junk hunting or raiding someone else's junk
closet, you might find a pile of the 9-pin and 25-pin to RJ-45
adapters that Cisco includes when you buy a router with a
console port. I hadn't thought about it that way, but is
this a handy source of alternatives to long serial cables?
If I use a cross-over cable, it is wired like a null modem?
- John
20 Jun
20 Jun
2:30 a.m.
--- Curt Vendel <curt(a)atari-history.com> wrote:
John....
Oh yeah, tons and tons of the DB9 to DB25 connectors using the flat
silk type cablings (light blue and black) or standard RJ45.... I don't
think the cross over cables for CAT5 would apply like a null-modem cable
though, you'd need to check the wiring in the hoods....
While you would not want to use a CAT5 crossover cable in one of these
serial dongles, what you _can_ do, at least with various wiring schemes
in common use, like Cisco's, is swap *regular* CAT5 (or CAT3*) cable
for the flat light-blue or black cables - *That's* how you get straight
through or null-modem - the two types of cables are wired inverted from
each other (1-1, 2-2, etc. vs 1-8, 2-7, etc.)
I do this all the time with Cisco adapters.
-ethan
* I have a box of CAT3 cables that were once used for patches in an
old network closet at a former job. We also used them for "phone
cords" for our Cisco IP phones - there's some toys I'd like to play
with at home - IP Telephony
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17 Jun
17 Jun
5:26 a.m.
--- Curt Vendel <curt(a)atari-history.com> wrote:
Its quite common....
Nearly all of the Cisco equipment have RJ45 console ports on them...
Yep. I have a bag of spare DE9 and DB25 Cisco hoods I use for just about
everything.
The great thing about the
console ports on most devices is that they use standard straight run CAT5
cables so you don't have to make up a custom one.
It depends. The Cisco stuff I have can use either a silver-satin-style
flat cable or CAT3/CAT5-style cable (presuming all 8 wires are run, not
just the two pair in use by 10BaseT). The advantage is that one style
of cable is flipped from the other, making an instant null-modem cable
by swapping out the wires between the hoods.
Unfortunately for me, I have Cisco-style RJ45 serial stuff, DEC MMJ
serial stuff, *and* several cubic feet of Nevada-Western RJ11 serial
stuff, including Telco-50 cables (like 50-pin SCSI-1 connectors) and
8-port boxes and 19" rack panels. It's what we used when we had 16-64
serial ports per VAX - custom cables that went from the 50-pin
connectors on the Unibus cards to the Telco-50s on the back of the
patch panels. Quite convenient. I got all of it when the company
closed (and ran a pair of 25-pair cables up my wall from the basement -
8 serial ports and 25 voice lines!).
-ethan
-ethan
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