[geeks] RJ-45

[Geoffrey Reed]

On 9/3/11 11:20 AM, "gsm at mendelson.com" <gsm at mendelson.com> wrote:

> Thanks everyone for the suggestions. I was being vague for a reason, but
> I'll explain why I can't cut, splice or extend the cables.
> 
> Back in the PC/XT days, the company who made the radios I want to program
> found that the UARTs used on XT's were not good enough for what they wanted
> to do, so they wrote code to generate serial data via rapidly changing
> the state of control lines on the serial port, bypassing the UART and
> and the normal RD/SD lines.
> 
> They also use something similar, if not TTL levels, on the programing port.
> 
> So they developed a box called a RIB (Radio Interface Box) which did the
> conversion. The input of the box is a standard serial port, the output
> is a DB-25. The DB-25 contains jumpers in it to set levels and other things,
> the radio part is three wires.

Motorola radios, eh?