An experimental high-speed, highthroughput packet switching system (HPS) which can accunnodate up to 10-Mbit/s lines based on X.25 protocols is being developed. This system can be used for multimedia communications such as voice and image as well as high-speed data communications. A fully distributed processing system architecture is used to achieve a highthroughput of 8 0 , 0 0 0 packetls and to accomnodate high-speed lines. This softwarecontrolled system can handle various packet lengths and types such as voice, image, and data. It also provides low packet delay for voice applications and high-reliability for data camnslications. In addition, high-speed packet switching system architecture, network protocols , system configurations , and service applications for high-speed mltimedia packet comnslications are described. INIWIDUCPCNThe packet switching network has rapidly been growing as a medium for personal computer to host computer corms-mications. In addition to low-speed data comunications, demand has also increased for voice, highspeed computer-aided design and manufacturing (CAD/CAM) , video conferencing and high-speedPacket switching systems can improve transmission efficiency by statistical multiplexing. However, the conventional packet switching system based on X.25 protocols can accomodate only 48 to 192 Kbit/s and can throughput only several tens of thousands of packets/s [2,31. It is not suitable for mltimedia cc"ications such as high-speed data, image, or voice comnslications. Highspeed, high-throughput packet switches supported by distributed processing architecture, advances in VLSI technology, and simplification of network protocols are being studied, focusing on flexible, highperformance, and high-quality services [4,5,61-Two approaches for high-speed packet switching networks that handle multiple classes of traffic have been studied. One will be capable of handling the existing X.25 or like protocols at up to several Mbit/s. The other is fast packet switching based on the asynchronous transfer mode (A'IM) [7]. The fast packet switching can handle 150 to 600 Mbit/s by using hardware control and simplifying network protocols. This paper first describes a high-speed, high-throughput switching system architecture, which can accunnodate up to lO-Mbit/s lines based on X.25 protocols. The X.25 protocols are flexible regarding packet length, congestion control, and retransmission procedure. In the past, high-speed transmissions at 10 Mbit/s have had problems because of X.25 protocol complications. The proposed system solves this limitation using a fully-distributed architecture , a hlgh-speed comunications control LSI, and high-speed software processing architecture. This paper then, describes network protocols for multimedia comunications and hardware and software configurations of this system. It finally evaluates end-to-end voice packet delays and discusses service applications. High-speed, High-Throughput PacketQwitchillg system Architecture 2.
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