[Back In The Saddle]

Spence, as I read your question, it seems more about how to determine which official covers which lines than necessarily about the jump. So I'll tackle that one.

• L and T should be on opposite sides of the floor (other than when the L comes ball side).
• Each official is responsible for the sideline on his side of the floor. Even when he comes ball side, the L is still responsible for the sideline on his "proper" side of the floor. (Note that there are some common variations on this theme, but I'm talking about the basic principle.)
• However you got to the side of the floor you're on, you will be responsible for that sideline until you change sides.
• There are three situations that can force officials to change sides: 1) Jump ball, 2) Free throw, 3) Throw-in.
• The jump ball is as you describe. The non-tossing official (no longer has to be the U) will be responsible for the sideline on the table side.
• Free throw administration may require the officials to change sides from where they were.
• A throw-in may require a change of sides as the administering official goes to the spot (or near the spot if bouncing the ball) and his partner goes opposite.
• Other than that, you do not normally change sides. But never say never.