Transfer Gate
A transfer gate is physically represented by the insertion of both a transfer-in gate and a transfer-out gate. These gates are used to link logic in separate areas of a fault tree. When you insert a transfer gate, the transfer-in gate links to a transfer-out gate, which represents the top gate of another tree.
Transfer-In Gate
Two primary uses exist for transfer gates.
If a tree does not fit on a single sheet of paper, you can use transfer gates to organize various portions on separate pages.
If the same logic is used in different places in a tree, you can use transfer gates to model repeated gates or repeated subtrees.
For more information, see Inserting Transfer Gates.