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Christopher Intemann wrote:

quoted text
> Hi,

> thanks for the hint, however, I'm in fact a bit more confused now:-)

> Couldn't I use such a thing:

> http://cgi.ebay.de/SERIAL-RS232-DB9-9-PIN-FEMALE-TO-RJ45-FEMALE-ADAPTOR_...

>

> In addition, I would then only need a RJ45 serial cable. Or an ordinary

> telephone cable with 4 wires, right?

In case you're curious, a telco guy would often call such a cable "quad", it

usually had pair colors red/green and yellow/black, with yellow/black being used

for receive, versus red/green for send, black and green were the tip conductors,

 red/yellow were the ring conductors.  This wasn't really specified as far as I

know, it was just common convention.
RJ45 is far from being the only Registered Jack that could terminate a quad

circuit (using 4 out or 8 total conductors.  There was even a way to wire the

ordinarily 2 wire RJ11, called RJ14, so that 4 out of the 6 conductors were used

(center 2 for circuit 1, outer 2 for circuit 2).  RJ45 is a pretty popular way

to refer to that 8 place connector, though.
All of these things are regularly violated, so you just have to take your chances.
> Thanks,

quoted text
>  Chris

>

>

> On Tue, Apr 28, 2009 at 3:42 AM, Jussi Peltola  wrote:

>

>> Many (probably 50%) of RJ11 4-wire telephone cables were crimped wrong

>> by the factory and are in fact  roll over cables (RJ11 fits in RJ45,

>> but you need 4 wires, 2 won't work).

>>

>> Saved me some from hair loss one sunday far away from everything.

>>

>> --

>> Jussi Peltola

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