Fujitsu Corporation

Koya Sakurai

Ryuichi Kondo

Toshifumi Fujimoto

Motoya Kurotsu

Seiichiro Hirayama

Yoshinori Chiba

Keiichi Kanno

A switching unit of a cross connecting device is expanded with no momentary interruption, while data loss and data overlapping is eliminated. To achieve such an expansion, a cross connecting device comprises a base set having a switching unit for determining an output channel based on virtual path information for cell data that is input and for outputting the cell data. An expanded set has a switching unit for receiving the cell data from the base set and cell data from another base set, and for determining an output channel based on virtual path information for both inputs of cell data and for outputting the cell data. A filter prevents the transmission, to the expanded set, of cell data for which the output channel is determined by the switching unit of the base set.

Uninterrupted-service expansion system for a cross connecting device

A clocking converter for asynchronous data capable of performing bit synchronization processes of asynchronous data of different patterns by the same circuit, requiring virtually no change made therein, and shortening the processing time while achieving downscaling of the circuit structure. The clocking converter is structured such that asynchronous data is successively delayed by a constant time interval in a sampling input means, the delayed multiple sampling data are latched by a latch means with a system clock while a latch signal is being supplied thereto, two changing points of the latched data are detected by a changing point detection means, the changing points are successively detected from one direction by a changing point output means, the phase virtually in the middle between the changing points is detected by a select signal generation means, and the sampling data corresponding to the phase is selected from among the multiple sampling data by a select means and output therefrom as the synchronous data.

Clocking converter for asynchronous data

Growing community of inventors

Sendai, Japan

Koya Sakurai