Root directory

Description

The term 'Root directory' is defined in 3GPP TS 21.905 as an obsolete term for 'Master File'. In the context of 3GPP, a Master File typically refers to a file that contains the master copy of data or configuration for a network element or management system. The root directory, in general computing, is the top-level directory of a file system, from which all other directories branch. In telecommunications management, the concept of a root directory may have been used in early specifications to denote the primary storage location for management data. However, as technology evolved, the term 'Master File' became preferred, and 'Root directory' was deprecated.

The definition in TS 21.905 is brief: 'Obsolete term for Master File.' This indicates that the term is no longer in active use within 3GPP specifications, but it is retained for historical reference. The term likely originated in the context of OSI management or early TMN (Telecommunications Management Network) models, where file-based management was more common. In those models, a root directory would be the starting point for navigating a hierarchical file system that stored management information. Over time, as management protocols became more sophisticated and object-oriented, the need for such file-based terminology diminished.

Despite being obsolete, understanding the term can be useful for interpreting legacy specifications or documents. It highlights the evolution of management concepts in telecommunications from simple file-based systems to complex, model-driven architectures. The term 'Master File' itself is also somewhat dated, as modern management systems use databases and object models rather than files. However, in some legacy contexts, a Master File might still refer to a configuration file that serves as the authoritative source for a network element's settings.

The fact that 'Root directory' is listed in TS 21.905, which is the vocabulary for 3GPP specifications, means it was once considered important enough to define. Its obsolescence reflects the rapid pace of change in telecommunications technology. Today, terms like 'root directory' are more commonly associated with operating systems and file systems rather than telecom standards. In 3GPP, the focus has shifted to network functions, service-based architectures, and cloud-native principles, leaving behind such file-centric terminology.

In summary, 'Root directory' is a deprecated term in 3GPP, synonymous with 'Master File'. It serves as a reminder of the evolution of management concepts in telecommunications. While no longer used in new specifications, it may appear in historical documents or discussions of legacy systems. Its definition in TS 21.905 ensures that readers of older specifications can understand its meaning, even if it is no longer actively used.

Purpose & Motivation

The term 'Root directory' was originally introduced to provide a standardized way to refer to the top-level directory in a file system used for management purposes in telecommunications networks. In early network management systems, data was often stored in files organized in a hierarchical directory structure. The root directory was the starting point for accessing all other files and directories. This concept was important for defining how management information was stored and retrieved. However, as network management evolved towards object-oriented and database-driven approaches, the need for file-based terminology decreased. The term became obsolete and was replaced by 'Master File', which itself is now less common.

The purpose of defining such a term in 3GPP specifications was to ensure a common vocabulary across different vendors and operators. In the early days of 3GPP, many concepts were borrowed from OSI and TMN, which used file-based management. The root directory was a fundamental concept in those models. However, the limitations of file-based management, such as lack of scalability and difficulty in representing complex relationships, led to the adoption of more advanced management paradigms. The term 'Root directory' thus represents a transitional phase in the evolution of telecom management.

Today, the term is obsolete, but its inclusion in TS 21.905 serves as a historical record. It reminds engineers that management concepts have evolved significantly. The purpose of retaining obsolete terms in the vocabulary is to aid in the interpretation of older specifications and to provide context for why certain terms are no longer used. This is important for maintaining backwards compatibility and for understanding the rationale behind current practices. While 'Root directory' is no longer relevant to modern 3GPP networks, its definition helps to trace the lineage of management terminology.