ECMA Standards ECMA-100 to ECMA-199
The European Computer Manufacturers Association (ECMA) has long played a pivotal role in the standardization of information technology. The range of standards from ECMA-100 to ECMA-199 represents a diverse era of computing, spanning the evolution of data storage, telecommunications protocols, and character encoding. These standards ensured that hardware and software from different vendors could communicate effectively, laying the groundwork for modern interoperability.
From the early days of flexible disk cartridges to the sophisticated Private Integrated Services Networks (PISN), these specifications reflect the industry's transition from physical media constraints to complex network signaling.
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Key Facts
- Diverse Scope: Covers everything from physical storage media (tapes, disks) to high-level network protocols and ergonomics.
- ISO Alignment: Many ECMA standards are closely linked to or adopted as International Organization for Standardization (ISO) standards.
- Legacy and Current Use: While many early standards (like ECMA-101 for ODA) are withdrawn, others (like ECMA-119 for CD-ROMs) remain applicable.
- Specialization: Significant focus is placed on PISN (Private Integrated Services Network) and QSIG signaling protocols.
Data Storage and Interchange Standards
A substantial portion of the ECMA-100 to 199 series focuses on the physical and logical formats of data storage. This includes the specification of flexible disk cartridges, magnetic tapes, and optical media.
Magnetic and Flexible Media
Early standards such as ECMA-100 and ECMA-125 defined the recording methods for 90 mm flexible disk cartridges. As storage needs grew, the focus shifted to magnetic tape cartridges, including the 3.81 mm wide helical scan recording formats (DDS and DAT) seen in ECMA-139 and ECMA-146, as well as the higher-capacity DLT formats in ECMA-182 and ECMA-197.
Optical Storage
The transition to optical media is well-documented in this series. ECMA-119 defines the volume and file structure of CD-ROMs (aligned with ISO 9660), while ECMA-130 covers the "Yellow Book" format. Later standards, such as ECMA-183 through ECMA-195, detail the capacities and structures of 130 mm and 300 mm optical disk cartridges, including Write Once, Read Multiple (WORM) technology.
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Telecommunications and Network Protocols
The series contains extensive documentation on Private Telecommunication Networks (PTN) and Private Integrated Services Networks (PISN). These standards define how data and voice services are managed within private corporate environments.
PISN and QSIG
The QSIG protocol is a recurring theme, providing the signaling procedures for inter-exchange communication. Standards like ECMA-143 and ECMA-164 specify how bearer services and name identification are handled between exchanges, ensuring seamless call routing and feature support across different network hardware.
Supplementary Services
Specific functional models were developed for various network features, including:
- Call Diversion: ECMA-173 and ECMA-174.
- Call Transfer: ECMA-177 and ECMA-178.
- Call Completion: ECMA-185 and ECMA-186.
- Do Not Disturb: ECMA-193 and ECMA-194.
Character Sets and Ergonomics
Beyond hardware and networking, ECMA addressed the human-machine interface and global communication through character encoding and ergonomic requirements.
8-Bit Character Sets
To support global languages, ECMA defined several 8-bit single-byte coded graphic character sets. These include support for the Cyrillic (ECMA-113), Arabic (ECMA-114), Greek (ECMA-118), and Hebrew (ECMA-121) alphabets, often in conjunction with ISO 8859 standards.
Ergonomics and Safety
The series also includes standards for the physical environment of computing. This includes requirements for monochromatic (ECMA-110) and color (ECMA-126) visual display devices, as well as the measurement of noise emissions from IT equipment (ECMA-108 and ECMA-109).
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Summary of Selected ECMA Standards
| Standard | Focus Area | Related Standard | Status |
|---|---|---|---|
| ECMA-107 | FAT File System | ISO/IEC 9293 | Applicable |
| ECMA-119 | CD-ROM Structure | ISO 9660 | Applicable |
| ECMA-143 | PISN QSIG-BC | ISO/IEC 11572 | Applicable |
| ECMA-151 | DCLZ Compression | ISO/IEC 11558 | Applicable |
| ECMA-109 | Noise Emission Values | ISO 9296 | Applicable |
Frequently Asked Questions
What is the relationship between ECMA and ISO standards?
Many ECMA standards are developed in parallel with or adopted by the International Organization for Standardization (ISO). For example, ECMA-119 is the equivalent of ISO 9660 for CD-ROM file structures.
Are all standards in the ECMA-100 to 199 range still in use?
No. While some remain applicable (such as those for noise emissions or specific file systems), many have been withdrawn as the technology they describe—such as early flexible disks or specific 1980s network interfaces—became obsolete.
What is PISN in the context of these standards?
PISN stands for Private Integrated Services Network. It refers to a set of standards that define the functional models and signaling protocols for private telecommunications systems within an organization.
Which standards in this range deal with text and language?
The 8-bit single-byte coded graphic character sets, such as ECMA-114 (Arabic) and ECMA-121 (Hebrew), were designed to standardize how different languages are represented digitally.
What is the purpose of the QSIG protocols?
QSIG protocols (found in standards like ECMA-143 and ECMA-165) provide a standardized method for signaling between different private exchanges, allowing different vendors' equipment to handle calls and services interoperably.