Fujitsu Corporation

Hiroaki Mori

Yoshinori Nakamura

Nobuo Iguchi

Miki Hagino

Kazuo Takatsu

Nobuyuki Nemoto

Akihiko Oka

Takashi Umegaki

Tatsuya Oku

Toshiharu Sakai

Toshikazu Ota

Yuuki Tsuji

An interface apparatus for SDH/SONET interconnection includes a transmission interface section provided at a position where an apparatus of the SDH system and an apparatus of the SONET system face each other and adapted to transmit a signal toward an apparatus of a different system. The interface apparatus for SDH/SONET interconnection further includes a mode setting unit for setting a mode suitable for an apparatus of a counterpart system, a frame synchronization information inserting unit provided in the transmission interface section and adapted to insert frame synchronization information corresponding to the mode set by the mode setting unit, and an overhead information inserting unit provided in the transmission interface section and adapted to insert overhead information corresponding to the mode set by the mode setting unit. This structure makes is possible to easily interconnect apparatuses of different systems (apparatuses of the SDH system and the SONET system) so as to operate them.

Interface apparatus for SDH/SONET interconnection

An optical terminal system having self-monitoring function is disclosed, which includes a high-level group loopback section for internally looping back a serial electric signal, a low-level group loopback section for internally looping back a parallel electric signal, a self-loop section for connecting a receiver device and a transmitter device to loop an electric signal received by the receiver device directly to the transmitter device, and a self-monitoring controller for performing a self-monitoring test on respective components of the receiver device and transmitter device by using the self-loop section and either one of the high-level group loopback section and the low-level group loopback section. The optical terminal system can selfcheck the functions thereof through self-monitoring without depending on a network.

Optical terminal system having self-monitoring function

A circuit for confirming a connection route of an address control memory includes a data memory, an address counter and the address control memory. The address control memory includes a reading memory for storing data to an address which is a respective position of the time-division multiplexed data in time slots given when the time-division multiplexed data is read from the data memory as an output data and the data is a respective position of the time-division data in the time slots given when the time-division multiplexed data is written into the data memory as input data. A writing memory is provided for storing data to an address which is a respective position of the time-division multiplexed data in time slots given when the time-division multiplexed data is written to the data memory as input data, and the data is a respective position of the time-division multiplexed data in time slots given when the time-division multiplexed data is read from the data memory, thereby specifying from the time slot position of data at the time of reading, the time slot position of data at the time of writing, and specifying from the time slot position of data at the time of writing, the time slot position of data at the time of reading.

Circuit for confirming a connection route of address control memory

Growing community of inventors

Osaka, Japan

Hiroaki Mori