Keiichiro Tsukamoto

Transmitter with cell switching function

Apparatus and method for interfacing between communication networks

Signal loopback device

Add/drop multiplexer and interface

Distributed power supply and method of recovering from error

ATM cell service apparatus accomodating an ATM cell in an optical asynchronous communications network through a North America asynchronous communications network

Transmission apparatus with control circuit/relay within each card providing connection to related card output depending on related slot ID/ redundancy/non-redundancy, working/protection signals

Distribution power supply device, and failure recovery method of distribution power supply

Atm cell service equipment and its method

Transmission apparatus and reception interface apparatus