We buy an ethernet cable at a standard length of eight feet.
It is possible to fix length of a cable and use routing to place
it? Or am I barking up the wrong tree by trying to use routing to
do this?
Yes you can do this. I do the same thing with 1-3 foot length
cables. Under the routing command, there is a choice of standard
cables. That is what you want. You will need to create the cable in
the excel spreadsheet that is called by this.