Longer HP-IL cable runs

[4ster]

I am working on a project where the HP-IL controller will be around 10 to 20 meters away from the listener. HP literature says that runs up to 10 meters "using simple 2 wire cables" and up to 100 meters "using shielded, twisted pair cables" are achievable.

I don't recall seeing HP-IL cables over more than a few meters in length for sale.

Is it as simple as taking two short cables, cutting them in half and soldering in the appropriate type of cable between the IL plugs?

An HP-IL cable has two wires. Is it these two wires that are the twisted pair for the longer runs or is it the outgoing and incoming cables that are twisted together? I am thinking that at a minimum I should try to find shielded 4 conductor twisted pair cable for my extensions.

I've always assumed the 2 wires in an individual IL cable are for backup in case one wire looses continuity, since information is only flowing one direction in HP-IL devices. Is this correct?