Overview
ISO/IEC 14776-154:2017 - "Information technology - Small Computer System Interface (SCSI) - Part 154: Serial Attached SCSI - 3 (SAS-3)" specifies the functional and protocol-layer requirements for the Serial Attached SCSI (SAS) physical interconnect and the SAS Protocol Layer‑3 (SPL‑3). The standard documents how SCSI devices exchange information over a serial interconnect that is compatible with the Serial ATA (SATA) physical interconnect, and it defines physical, electrical and protocol-level rules for SAS‑3 implementations.
Key Topics and Technical Requirements
- Physical layer definitions: detailed requirements for PHYs, phys, and physical links supporting SAS‑3.
- Data rates and compliance points: provisions for 1.5, 3, 6 and 12 Gbit/s operation, including compliance points and test criteria for different link speeds.
- S-parameter and Tx/Rx limits: technical limits and conventions for defining maximum S‑parameter values and TxRx connection characteristics used in signal integrity and compliance testing.
- Connectors and interconnects: specifications and recommended electrical performance for a wide range of connectors and assemblies, including SAS drive connectors, Micro SAS, Mini SAS, Mini SAS HD, SAS 4i, QSFP+, and associated pin assignments.
- Cable assemblies and backplanes: internal/external cable assembly formats (fanout, symmetric), backplane requirements, and active cable power/management interfaces.
- Phy test functions and numeric conventions: test procedures, terminology, symbols, abbreviations and editorial conventions used throughout SPL‑3.
- Interoperability with SATA: rules ensuring compatibility between SAS and Serial ATA physical interconnects.
Practical Applications
- Designing and validating enterprise storage systems and controllers that implement SAS‑3 (12 Gbit/s) interfaces.
- Developing and certifying host bus adapters (HBAs), RAID controllers, SAS expanders, backplanes, and drive sleds to meet ISO/IEC compliance.
- Producing compliant cables, connectors and active cable modules (QSFP+) for high‑performance data centers.
- Performing interoperability and signal‑integrity testing in third‑party test labs and OEM engineering groups.
- Ensuring compatibility between SAS and SATA devices in mixed storage environments.
Who Should Use This Standard
- Hardware engineers and system architects working on storage interconnects
- Storage array OEMs, HDD/SSD and NVMe bridge designers
- Connector and cable manufacturers
- Compliance labs and QA/test engineers
- Data center infrastructure planners and system integrators
Related Standards
- Other parts of the SCSI family and the Serial ATA (SATA) physical interconnect specifications - for interoperability and complementary requirements. SPL‑3 (the SAS Protocol Layer‑3) is part of the broader SAS-3 specification set documented in ISO/IEC 14776‑154:2017.
Keywords: ISO/IEC 14776-154:2017, SAS-3, Serial Attached SCSI, SPL-3, SATA compatibility, physical interconnect, connectors, Mini SAS HD, QSFP+, 12 Gbit/s, compliance testing.
Open preview (PDF)Information technology — Small Computer System Interface (SCSI) — Part 154: Serial Attached SCSI — 3 (SAS-3)
