This part of ISO/IEC 11518 provides the mechanical, electrical and signalling protocol specifications for an efficient simplex high-performance Point-to-Point interface between pieces of data-processing equipment. The interface described in this patt of ISO/IEC 11518 tan be operated at peak data rates of 800 or 1 600 Mbit/s, over distances of up to 25 m by means of topper cabling. A distance-independent signalling protocol allows the average data rates to approach the peak data rates, even over distances longer than specified for the HIPPI-PH. The purpose of this part of ISO/IEC 11518 is to facilitate the development and use of Computer Systems by providing a common interface at the physical and data framing layers. lt provides an efficient interconnection between Computers, high-performance display Systems, and high-performance, intelligent block-transfer peripherals. The interface is optimized for large block transfers.