Kazuo Hajikano

Experimental broadband ATM switching system

The authors describe an ATM (asynchronous transfer mode) switching architecture based on a self-routing principle and an experimental system constructed by connecting self-routing modules in a three-stage link configuration. The architecture is called multistage self-routing (MSSR). It is confirmed that MSSR switching can deal with various media such as voice, data, and video.<<ETX>>

Asynchronous transfer mode switching architecture for broadband ISDN-multistage self-routing switching (MSSR)

The authors propose an architecture for asynchronous-transfer-mode (ATM) switching which is based on a self-routing switching principle. It is constructed by connecting self-routing switching modules in a three-stage link configuration, an architecture called multistage self-routing (MSSR). The cell-loss probability and delay have been evaluated. The results show that even when voice signals occupy 70% of the transmission capacity and burst data occupy 20%, the average delay per node is less than 60 mu s and the cell-loss probability is less than 10/sup -9/. This shows that this system has a larger traffic capacity than existing circuit switches, which are designed for an average loading of 70 to 80%.<<ETX>>

A study on high speed data communication system using ATM

The authors discuss different ways of offering connectionless service in asynchronous transfer mode (ATM) networks. They examine two alternatives for offering connectionless communication. One is the indirect offering method and the other is the direct method. The layout and configuration of CLSF (connectionless service function) in the network that are required by the direct offering method are examined. An arrangement of CLSF in the network is proposed. The elements of CLSF and the allocation of CLSF functions on the ATM switching system are considered. Based on these discussions, the architecture of the CLSF is proposed using cell-based processing, instead of message-based processing.<<ETX>>

Variable bit rate HDTV communication in ATM networks

Variable bit rate high-definition-television (HDTV) communication in asynchronous-transfer-mode (ATM) networks is discussed. Terminal functions required for support of variable-bit-rate HDTV communication are outlined. Detection of lost and misdelivered cells, handling of cell delay variation, source clock frequency recovery, and segmentation and reassembly of user information are shown to be adaptation layer requisites. Multimedia multiplexing, virtual channel control, and required network quality for multimedia communication are also discussed. Adaptation functions for intrafield adaptive differential pulse-code modulation coding are described, and an experimental HDTV codec and an ATM terminal adapter are presented.<<ETX>>