ISO/IEC 11518-10:2001

Overview

ISO/IEC 11518-10:2001 specifies the physical layer for the High-Performance Parallel Interface (HIPPI-6400-PH), defining a point-to-point, full‑duplex link for reliable, flow‑controlled transfer at 6 400 Mbit/s per direction. The standard covers a parallel copper interface for short runs (up to 40 m) and provisions for a separate optical interface for longer distances (link‑level operation tuned for up to 1 km). It is focused on low‑latency, high‑throughput transfers using fixed‑size micropackets plus components for large transfers, with built‑in flow control, automatic retransmission, and checksum mechanisms.

Key topics and technical requirements

• Data rate and topology: Full‑duplex point‑to‑point at 6 400 Mbit/s per direction; link protocol optimized for up to 1 km.
• Micropacket structure: Definition of a compact, fixed‑size micropacket for efficient small transfers and headers for message routing.
• Flow control and retransmission: Credit‑based flow control, ACK/NAK behavior and automatic retransmission for error recovery.
• Checksums and integrity: Link‑to‑link and end‑to‑end checksum schemes (LCRC/ECRC) to ensure data integrity.
• Physical interfaces: Specifications for a parallel copper coaxial cable interface (electrical timing, connectors, cable layout) and connections to a local optical interface.
• Signal encoding and timing: Bit/byte assignments, CLOCK and FRAME signaling, line coding (e.g., 4b/5b where specified), skew compensation and training sequences.
• Link management: Initialization, link reset, activity monitoring, shutdown, timeouts and logged events for maintenance and control.

Applications and who uses it

ISO/IEC 11518-10 (HIPPI-6400-PH) is relevant to:

• Hardware designers and electrical engineers building high‑speed interconnects (NICs, host adapters).
• System architects and data center designers deploying low‑latency, high‑bandwidth links between servers, storage arrays, and switches.
• Manufacturers of high‑performance computing (HPC) clusters, storage area networks (SANs), and specialized appliances requiring deterministic, high‑throughput links.
• Standards committees and implementers needing a reference physical layer for interoperability testing and product certification.

Practical benefits include predictable low latency for small messages, robust error handling for long‑distance links, and detailed cable/connector and timing guidance for reliable deployment.

Related standards

• ISO/IEC 11518‑1: HIPPI physical (mechanical, electrical and signaling)
• ISO/IEC 11518‑2: Framing Protocol (HIPPI‑FP)
• ISO/IEC 11518‑3: Encapsulation of IEEE 802.2 (HIPPI‑LE)
• ISO/IEC 11518‑4: Mapping to IPI command sets (HIPPI‑IPI)
• ISO/IEC 11518‑5: Memory Interface (HIPPI‑MI)

Keywords: ISO/IEC 11518-10, HIPPI-6400-PH, High-Performance Parallel Interface, 6400 Mbit/s, micropacket, copper cable, optical interface, flow control, retransmission, checksum, physical layer.