TELECOM Digest OnLine - Sorted: Re: USB to RJ-45 Console Cable?

Re: USB to RJ-45 Console Cable?

Scott Dorsey (
4 Apr 2005 18:50:56 -0400

JXM2119 <>

> I have already read and seen that there are cables/adapters that
> go from USB to DB-9. That would allow you to connect your standard
> serial console cable as you normally would. I am trying to find a way
> to eliminate this.

Those boxes have a lot of electronics inside them, basically one FPGA
that is programmed to do all the conversion.

> I would like to buy/make a cable that will have a USB connector on one
> end and an RJ-45 on the other. I'm not sure if it is as easy as
> cutting off a connector on the usb and just terminating the RX/TX/GND
> like you can do with a serial cable (DB-9).

No, it's not even close. This would be like transplanting a dog's
head on a human being. It takes a good bit of glue logic, and I
suppose you could build all the glue yourself with TTL but you'd wind
up with a big expensive box full of stuff.

What is wrong with the USB/RS-232C interface boxes that you don't like?
Can you just put a serial card in your machine?


"C'est un Nagra. C'est suisse, et tres, tres precis."

[TELECOM Digest Editor's Note: I'd feel very sorry for the dog, if
the animal lived through it all. PAT]

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