I was referring to the colors inside of the DB hood, not the rj45 cable
itself which can vary from anything from orange, orange/white, green
green/white, blue blue/white, brown, brown/white for most cat5 cabling to
the various red,green,yellow,read,blue,white,brown,grey for others like the
flat or silk cables from Cisco, and other manufactures.
Curt
----- Original Message -----
From: "Pete Turnbull" <pete_at_dunnington.u-net.com>
To: <classiccmp_at_classiccmp.org>
Sent: Wednesday, February 06, 2002 4:04 PM
Subject: Re: RJ45 to serial DE-9
> On Sep 6, 11:27, Curt Vendel wrote:
>
> > You can use any straight through RJ45 cable, standard Cat5 is fine as
> well.
> > Radio Shack sells do it yourself connector kits with rj45 on the plastic
> > hood and you just plug in the appropriate cables to the connector, for
> the
> > DB-9/DE-9 wire as follows:
> >
> > 2 - yellow
> > 3 - black
> > 4 - orange
> > 5 - green & red
> > 6 - brown
> > 7 - blue
> > 9 - white
> >
> > If you run into problems and can't get it going, just let me know, I've
> made
> > like a doz of them as I use them all the time on various cisco devices.
>
> That's somewhat Cisco-specific, if those are the standard colours. The
> standard colours for 8-way flat cable (in order in the cable) are
>
> 1 grey (some cables use white)
> 2 orange
> 3 black
> 4 red
> 5 green
> 6 yellow
> 7 blue
> 8 brown
>
> However, that's not always used in pre-made sockets. I have three
> different ones on the desk beside me. One goes blue, orange, black, red,
> green, yellow, brown, white, for example. That would give you the
> following pinout:
>
> RJ45 pin DE9 pin signal
> white 8 9 Ring Indicator
> brown 7 6 Data Set Ready
> yellow 6 2 Transmit Data
> green 5 5 Signal Ground
> red 4 5 Signal Ground
> black 3 3 Receive Data
> orange 2 4 Data Terminal Ready
> blue 1 7 Request To Send
>
> It would be much more usual to pair RTS with CTS (DE9 pin 8).
>
> One of the most common ways to wire an RJ45 for serial, are to wire the
> centre pair both to ground, with TxD on one side and RxD on the other.
> That way, if you turn the cable upside down you (as in a normal flat
> cable, one end is wired opposite to the other) you cross over RxD and TxD
> without losing the ground. TxD is pin 3 on a PC-compatible DE9 serial
> port, RxD is 2, and signal ground is pin 5, so that's fine. In a flat
> cable, the pairs start from the centre two wires, and work outwards to
both
> sides, ending up with the 4th pair being the two outermost wires.
>
> But most systems that use this scheme put DTR and DSR (or occasionally
DCD)
> on the next wires out from the centre (3rd pair), and DTR is on DE9 pin 4
> (orange, OK) and DSR on pin 6 (brown, no I don't think so) and DCD on pin
1
> (which Cisco obvioously doesn't use). The reason for putting DTR and DSR
> (or DCD) on the next two wires is again for the crossover effect. That's
> what DEC and several other companies do.
>
> Similarly, some systems put RTS and CTS on the outermost two wires.
>
> Looks like Cisco are using a non-standard colour order (or your RS adaptor
> is) but otherwise following one of the common wirings for flat cable
> (except for RI and RTS!).
>
> Of course, lots of people use UTP instead of flat cable. Then one way to
> start off is to put TxD and corresponding ground on pins 1+2 (which is one
> pair) and RxD and corresponding ground on the next pair (3+6). That way,a
> normal UTP crossover cable (one end wired to TIA 568A and the other to
> 568B) crosses things over correctly. That leaves 4+5 and 7+8 for other
> signals, usually unused but sometimes DTR+DSR and RTS+CTS (to keep each
> pair of signals in a single pair of wires, but it makes crossover cables
> "interesting"). DEC do it like that, they put 1 and 3 on the RJ45 to
> ground (actually Tx- and Rx-), TxD and RxD on 2 and 6, DTR and DSR on 7
and
> 8. Sun do a similar thing (but not quite the same).
>
> There is *no* standard for this, and I've found at least three common (and
> largely incompatible) wiring schemes, and several more obscure ones
> (Cabletron, Xylogics, ...)
>
> --
> Pete Peter Turnbull
> Network Manager
> University of York
Received on Wed Feb 06 2002 - 17:39:02 GMT