Mitsubishi Denki Kabushiki Kaisha

Takane Kakuno

Takamasa Suzuki

Shuji Ito

Sakae Nakano

Mikio Yoshioka

Haruko Kawahigashi

Takeshi Shimpuku

A time division switching apparatus for interchanging data between an input highway and an output highway includes a number of buffer memories each receiving the same data from the input highway in parallel, a control memory for controlling the addresses of the buffer memories into which the data is written, and for controlling the addresses of the buffer memories from which data is written, at specific time positions. The apparatus may include demultiplexing/multiplexing circuitry for converting serial data to parallel data for storing in the buffer memories and parallel data from the buffer memories to serial data to be sent to the output highway. Data be interchanged according to specific data bit units or time slot units, wherein each time slot defines a specific number of data bits.

Time division switching apparatus

The present invention provides a transmission line encoding/decoding system wherein encoding is effected in such a manner that an overhead bit which indicates whether or not a slot, all the bits of which are '0' bits (hereinafter referred to as an all-'0' slot), is present among a plurality of slots constituting in combination one block and is set in a predetermined slot in the block, and if there are all-'0' slots, a slot information bit which indicates the slot position of at least one all-'0' slot is set and at least one all-'0' slot the position of which is indicated by the slot information bit is deleted, and wherein decoding is effected in such a manner that whether or not an all-'0' slot was present in one block before the encoding process is judged on the basis of an overhead bit set at a predetermined position in the block of the received data, and if it is judged that there was an all-'0' slot, the slot information bit indicating the slot position of the all-'0' slot that has been set in the received block is removed and an all-'0' slot is reconstructed at the position indicated by the slot information bit.

Transmission line encoding/decoding system

Growing community of inventors

Kanagawa, Japan

Takane Kakuno