Fujitsu Corporation

Hidetoshi Iwasa

Kiyofumi Mitsuze

Yoshiharu Kato

Ryo Takajitsuko

Atsushi Fujihira

Hiroya Kawasaki

Masaki Kira

A switching system for controlling internal apparatuses provided within an exchange system includes a central controller and a switching module including a plurality of objective apparatuses, each objective apparatus including a control data end unit, controlled by the central controller based on DMA communication and SD/SCN signal. Further, the central controller includes a first processor access controller which transfers control data to the control data end unit, in order to check and control each of objective apparatus, based on the DMA communication and the SD/SCN signal. The switching module includes a second processor access controller which relays the control data transferred between the first processor access controller and a plurality of control data end units-based on the DMA communication and the SD/SCN signal. According to the present invention, it is possible to realize high speed data transfer and high reliability based on the DMA communication and the SD/SCN signal between the central controller and each objective apparatus.

Switching system for controlling internal apparatuses in an exchange system

A duplex memory control apparatus having a first control unit containing a first memory and a second control unit containing second memory, a first control unit and a second control unit connected to each other through a bus. The first control unit having a central processing unit writing write data in the first memory; a transmitter obtaining the write data to be written in the first memory by the central processing unit, a transmitter, when a write data can be specified based on another write data previously obtained, transmitting specific data smaller than a write data to the second control unit instead of the write data; a first bus mutually connecting the central processing unit, the first memory an the transmitter; a first direct memory access unit reading the write data held int eh first memory through the first but; a second bus connected with a first direct memory access unit; and an access limiter connected to the first bus and the second bus and limiting to use the first bus by the first direct memory access unit when the central processing unit uses the first bus. The second control unit having a data producing section receiving the specific data from the transmitter and producing an original write data based on the specific data; and a second direct memory access unit writing the original write data produced by the data producing section into the second memory.

Duplex memory control apparatus

An exchange equipment using STM able to achieve an improvement of an efficiency of use and an improvement of ease of increase of terminal cards, that is, an STM type exchange, including a time switch, for performing exchange processing of time division multiplexed data, wherein a ring highway is connected via a terminal common unit to an upstream highway and a downstream highway coupled to this time switch via a highway interface unit or directly and wherein a plurality of terminal cards are connected to this ring highway. Each terminal card is provided with an add/drop unit which drops and adds the data from and to an assigned time slot on the ring highway according to control information indicating time slot assignment information determined by the control unit and adds the data and with a card control unit which controls the add/drop unit.

Growing community of inventors

Yokohama, Japan

Hidetoshi Iwasa