**2. Current system**

The current system concerning the least stand-by power by using a 1x7 all-optical switch is composed of a 1x7 optically-gated optical switch, 7 optical interfaces for each user terminal and a reflection-type star coupler (Fig. 1). The key equipment of the least stand-by power system is both a control system and an optically-gated optical switch, which is controlled directly by each user terminal ordering to occupy the circuit by selecting the 1x7 opticallygated optical switch. To avoid collisions among the user terminals, a control system is employed.
