Fujitsu Corporation

Nobuo Iguchi

Yoshinori Nakamura

Hiroaki Mori

Miki Hagino

Kazuo Takatsu

Michio Kusayanagi

Nobuyuki Nemoto

Akihiko Oka

Takashi Umegaki

Akio Morimoto

Toshikazu Inoue

Tatsuya Oku

Toshiharu Sakai

Toshikazu Ota

Shinya Nakagaki

Kazuya Kumazaki

Yuuki Tsuji

Mineharu Hattori

Tetsuji Ichikawa

A converter for connecting its ATM network with other ATM networks through a LAN, which is provided with an address translation table storing external VPIs, internal VPIs uniquely assigned to the LAN, and opposing MAC addresses for opposing converters in correspondence and a processing unit for performing control for transmitting, to the LAN, frames changed from the external VPI/VCIs of headers of cells from its ATM network to the internal VPI/VCIs by referring to the address translation table and having opposing MAC addresses corresponding to the internal VPI/VCIs attached, removing the opposing MAC addresses of frames received from the LAN by referring to the address translation table, and transmitting cells changed from internal VPI/VCIs to external VPI/VCIs to its ATM network.

Converter and communication control method

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

Growing community of inventors

Osaka, Japan

Nobuo Iguchi