Most PTO kits are standard sets... . the ones I have on a Fuller 9 speed behind a 10 L Cat engine will fit the 6 speed in my 04, 04. 5 and 05 NV5600 transmissions.
You pull a cover off the transmission, and bolt on the PTO kit... . You can have the kit live... . turning all the time or one with a clutch which you engage while its stopped... . (transmission is not moving). . The ones on the Fuller are turned on and off with air pressure from the air brake system... .
Most of the kits I've seen are Muncie and Dana... . the output shaft on the kit is usually splined so that you can connect a drive shaft to it... . On the fuller above it turns a large hydraulic pump... .
On large mixer trucks there can be a PTO system in the clutch..... Mostly used on Mack Cement trucks... .
I personally haven't seen the Asin transmission but I can only assume its the same..... Hope this helps...