The cables are straight through 50 pin ribbons. IDC edge connector on
one end
(same as 8" floppy connectors) and .1" socket on the other. I've seen
normal
flat used on short runs and "twist and flat" 25 pair used on longer
runs. 6'
or so should be fine with the standard flat grey stuff. The coupler
manuals
limit the length to 25'