ISO/IEC 14776-121:2010 PDF

Information technology — Small Computer System Interface (SCSI) — Part 121: Passive Interconnect Performance (PIP)

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Title (English):

ISO/IEC 14776-121:2010

Information technology — Small Computer System Interface (SCSI) — Part 121: Passive Interconnect Performance (PIP)

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 85
Publication date:: October 22, 2010
Edition:: ISO/IEC IS 14776 edition 1 version 1
ICS:: 35.200

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Description (English):

ISO/EC 14776-121:2010(E) specifies the performance requirements of the interconnect and expands the coverage to the complete assembled interconnect including connectors, uniform bulk cable, and non-uniform bulk cable. A syntax and framework is described for all types of passive interconnect. The methodology for performing the electrical measurements required to determine compliance with the performance requirements for bulk cable of several types, various assembled interconnects and printed circuit board designs is included. Details of the measurement methodology are specified to minimize the difference in measured results from different electrical testing laboratories. Details include calibration, fixturing and sample preparation, equipment, measurement procedure and data output format.

Technical details

Technical committee: ISO/IEC JTC 1/SC 25 - Interconnection of information technology equipment
SKU: ISO/IEC 14776-121:2010

Abstract

Overview

ISO/IEC 14776-121:2010 - “Information technology - Small Computer System Interface (SCSI) - Part 121: Passive Interconnect Performance (PIP)” defines performance and test requirements for SCSI passive interconnects. The standard expands coverage to complete assembled interconnects including connectors, uniform and non‑uniform bulk cable, and printed circuit board (PCB) interconnects. It provides a common syntax and framework for characterizing all types of passive interconnect and a detailed measurement methodology so electrical test results are consistent across laboratories.

Key topics and technical requirements

Scope of constructs: point‑to‑point and multi‑drop bulk cable, assembled interconnect assemblies, transition regions and interconnect sub‑assemblies.
Measurement methodology: detailed procedures for calibration, fixturing, sample preparation, measurement equipment, test setup, and data output format to reduce inter‑laboratory variation.
Electrical tests and parameters:
- Differential/local impedance
- Differential propagation time and skew
- Differential capacitance (calculated and frequency‑domain measured)
- Insertion loss and received signal quality requirements
- Error‑rate considerations and signal accommodation for receiver compensation
Test artifacts: standardized test fixtures, bulk cable sample preparations (various lengths and topologies), and PCB test fixtures are specified to enable repeatable testing.
Performance levels and compliance: defines acceptable values, measurement conditions (including pre‑compensation scenarios), and how launch/signal requirements relate to SPI‑x SCSI signalling.

Applications and who should use it

ISO/IEC 14776-121 is practical for:

Hardware and interconnect designers (cable, connector, PCB layout) verifying SCSI passive interconnect performance.
Manufacturers of SCSI cables, connectors and assemblies performing product qualification and quality control.
Independent electrical testing laboratories implementing standardized test setups and calibration to produce comparable measurement data.
System integrators and QA teams ensuring interoperability and signal integrity in SCSI subsystems.
Standards and compliance engineers mapping interconnect performance to SPI‑x device requirements.

Practical uses include pre‑production qualification, failure analysis, supplier acceptance testing, and verifying that assembled interconnects meet SCSI performance thresholds for reliable high‑speed data transfer.

Related standards

Other parts of the ISO/IEC 14776 (SCSI) series and SPI‑x signalling specifications (referenced in the document) define device and signalling requirements that this PIP standard helps realize at the interconnect level.

Keywords: ISO/IEC 14776-121:2010, SCSI, Passive Interconnect Performance, PIP, bulk cable testing, connector testing, measurement methodology, signal integrity, test fixtures, calibration, PCB interconnect.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and technical requirements

Scope of constructs: point‑to‑point and multi‑drop bulk cable, assembled interconnect assemblies, transition regions and interconnect sub‑assemblies.
Measurement methodology: detailed procedures for calibration, fixturing, sample preparation, measurement equipment, test setup, and data output format to reduce inter‑laboratory variation.
Electrical tests and parameters:
- Differential/local impedance
- Differential propagation time and skew
- Differential capacitance (calculated and frequency‑domain measured)
- Insertion loss and received signal quality requirements
- Error‑rate considerations and signal accommodation for receiver compensation
Test artifacts: standardized test fixtures, bulk cable sample preparations (various lengths and topologies), and PCB test fixtures are specified to enable repeatable testing.
Performance levels and compliance: defines acceptable values, measurement conditions (including pre‑compensation scenarios), and how launch/signal requirements relate to SPI‑x SCSI signalling.

Applications and who should use it

ISO/IEC 14776-121 is practical for:

Hardware and interconnect designers (cable, connector, PCB layout) verifying SCSI passive interconnect performance.
Manufacturers of SCSI cables, connectors and assemblies performing product qualification and quality control.
Independent electrical testing laboratories implementing standardized test setups and calibration to produce comparable measurement data.
System integrators and QA teams ensuring interoperability and signal integrity in SCSI subsystems.
Standards and compliance engineers mapping interconnect performance to SPI‑x device requirements.

Related standards

Other parts of the ISO/IEC 14776 (SCSI) series and SPI‑x signalling specifications (referenced in the document) define device and signalling requirements that this PIP standard helps realize at the interconnect level.

ISO/IEC 14776-121:2010 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and who should use it

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and who should use it

Related standards

Related standards

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