The fence is a "post rail" fence. It is a three-rail fence (you can have a two rail).
I spec'd it out, but had our local Agway contract it out - they did a fantastic job.
If you go for the fabric like I did (the wire fence attached to the wooden fence), INSIST on black even if they have to order it. Do NOT let them talk you into green.
Also when the fence is installed it will not look as rustic as mine. It takes 6 months to a year before it startes to get that weathered look.
IIRC, the rails come in either 8 foot or 10 (maybe 12?) foot lengths. Ours is 10 foot. I like the look better and it was easier to figure out how much fencing we needed. I just cut a 10ft piece of rope and my wife and I walked around the yard where we wanted the fence, measuring all the way. I made a drawing on the computer, brought it to the place, and got exactly what I wanted.
My back yard is probably about 1/2 acre, and the fence cost us about $2000 full installed.
HTH,
GAD