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Here's the rule:
"JUMP-BALL ADMINISTRATION
ART. 1 . . . For any jump ball, each jumper shall have both feet within that half of the center restraining circle which is farther from his/her basket.
ART. 2 . . . When the referee is ready and until the ball is tossed, nonjumpers shall not:
a. Move onto the center restraining circle.
b. Change position around the center restraining circle.
ART. 3 . . . Teammates may not occupy adjacent positions around the center restraining circle if an opponent indicates a desire for one of these positions before the referee is ready to toss the ball.
ART. 4 . . . The referee shall then toss the ball upward between the jumpers in a plane at right angles to the sidelines. The toss shall be to a height greater than either of them can jump so that it will drop between them.
ART. 5 . . . Until the tossed ball is touched by one or both jumpers, nonjumpers shall not:
a. Have either foot break the plane of the center restraining circle cylinder.
b. Take a position in any occupied space.
ART. 6 . . . The tossed ball must be touched by one or both of the jumpers after it reaches its highest point. If the ball contacts the floor without being touched by at least one of the jumpers, the referee shall toss it again.
ART. 7 . . . Neither jumper shall:
a. Touch the tossed ball before it reaches its highest point.
b. Leave the center restraining circle until the ball has been touched.
c. Catch the jump ball.
d. Touch the ball more than twice.
The jump ball and these restrictions end when the touched ball contacts one of the eight nonjumpers, the floor, a basket or backboard.
NOTE: During a jump ball, a jumper is not required to face his/her own basket, provided he/she is in the proper half of the center restraining circle. The jumper is also not required to jump and attempt to touch the tossed ball. However, if neither jumper touches the ball it should be tossed again with both jumpers being ordered to jump and try to touch the ball."
Your question about when is the referee ready is a good one. I'd have to say just prior to his tossing of the ball, but it is a gray area.
The nonjumpers ARE allowed to move. The ones on the circle may back off anytime they wish, and those not on the circle can be running around the whole time in any direction they choose. There is NO REQUIREMENT that they remain still. That is simply a myth.
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