The ASC1 is the short coiled sync cord that would plug from the round sync jack on many professional cameras to the household sync jack on many Lumedyne Flash Heads.
It is about two feet long before stretching the coils out and could reach almost five feet (but might not shrink back all the way if stretched too far).
The ASC5 is the long straight sync cord (30 feet is about 9 meters) that would plug from the round sync jack on many professional cameras to the household sync jack on many Lumedyne Flash Heads.
It's perfect as a back up option to radio slaves when you want an off camera light and you have a PC sync connection or adapter on your camera.