ISO IEC 13239-2002 PDF

Full title and description

ISO/IEC 13239:2002 — Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures. This International Standard defines the HDLC frame structures, procedural elements, classes of procedure (unbalanced, balanced, connectionless), the content and format of the general-purpose Exchange Identification (XID) frame, and mechanisms for resolution/negotiation of data-link layer addresses in switched environments for bit-oriented HDLC implementations.

Abstract

ISO/IEC 13239:2002 specifies bit-oriented high-level data link control (HDLC) procedures for synchronous and start/stop (asynchronous) code‑transparent transmission. It defines basic and non‑basic frame formats, transparency mechanisms, address extension and addressing conventions, three frame check sequence options, the elements and classes of procedures (including commands, responses and operational modes), the general‑purpose XID frame for capability exchange and negotiation, and methods for address resolution/negotiation in switched environments. The standard provides a common basis for diverse data‑link implementations rather than a single system specification.

General information

• Status: Published (International Standard, confirmed).
• Publication date: July 2002 (some national listings show an effective date of 22 August 2002).
• Publisher: International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC) — joint publication (ISO/IEC JTC 1/SC 6).
• ICS / categories: 35.100.20 (Data link layer).
• Edition / version: Edition 3 (2002).
• Number of pages: 128.

Scope

The standard applies to data communication systems using bit‑oriented HDLC control procedures and covers frame structure and composition, transparency (bit‑pattern independence) mechanisms, frame check sequence options and negotiation, address field extension and addressing conventions, detailed elements of data link control procedures for both synchronous and start/stop modes, the definition of HDLC classes of procedures (unbalanced, balanced and connectionless modes) and the format/content of the general‑purpose XID frame used for capability exchange and single‑exchange negotiation. It also includes methods to resolve or negotiate data‑link layer addresses in switched circuit environments.

Key topics and requirements

• HDLC frame formats: basic and non‑basic frame layout, fields and ordering (address, control, information, FCS, flags).
• Transparency mechanisms (bit stuffing and related rules) to ensure bit‑pattern independence within frames.
• Frame Check Sequence (FCS): specification of three FCS variants (8‑bit, 16‑bit and 32‑bit) and rules for FCS negotiation and selection.
• Address field extension rules and addressing conventions for point‑to‑point and multipoint configurations.
• Elements of procedures: control‑field formats, commands/responses, state machines, exception reporting and recovery behavior.
• Classes of procedures: unbalanced (primary/secondary), balanced (peer/combined) and connectionless classes, with optional functions and conformance notes.
• General‑purpose XID frame: structure, encoding, single‑exchange negotiation process, and use for capability exchange (including parameter negotiation and private parameter encapsulation).
• Address resolution/negotiation mechanisms for switched environments to select operational link addresses when preassigned addresses are not available.

Typical use and users

Implementers and integrators of data‑link layer protocols and equipment (embedded device firmware, modem/terminal manufacturers, network equipment vendors), protocol designers who base higher‑layer protocols on HDLC framing, test and conformance laboratories, and system architects working with legacy and interoperable communications links (point‑to‑point, multipoint, synchronous and asynchronous links). It is also used as a normative reference in other communications and transport standards and by organizations maintaining HDLC‑based protocols.

Related standards

ISO/IEC 13239:2002 consolidates and supersedes earlier HDLC‑related publications; notable related or predecessor standards include ISO/IEC 13239:2000, ISO/IEC 3309 (earlier framing/FCS work), ISO/IEC 4335, ISO/IEC 7809 and ISO/IEC 8885. ISO/IEC 13239 is commonly referenced by other communications standards and profiles that specify HDLC framing or use HDLC subsets.

Keywords

HDLC, high‑level data link control, data link layer, frame format, frame check sequence, FCS, XID, exchange identification frame, address resolution, transparency, bit‑oriented, control procedures, unbalanced, balanced, connectionless.

FAQ

Q: What is this standard?

A: ISO/IEC 13239:2002 is the international standard that defines High‑Level Data Link Control (HDLC) procedures — frame formats, control procedures, classes of operation, XID negotiation and address resolution mechanisms for bit‑oriented data link implementations.

Q: What does it cover?

A: It covers HDLC frame structure and transparency, address and address‑extension rules, three FCS options and negotiation, the elements and state behavior of HDLC procedures, classes of operation (unbalanced, balanced, connectionless), the general‑purpose XID frame format and methods for data‑link address resolution/negotiation in switched environments.

Q: Who typically uses it?

A: Firmware and protocol implementers, network equipment and modem vendors, systems integrators, test/conformance labs, and standards authors who need a normative HDLC specification or interoperable data‑link behavior.

Q: Is it current or superseded?

A: The 2002 edition (Edition 3) is the published edition that replaced earlier versions (including the 2000 edition) and a number of prior HDLC‑related documents. The standard is maintained by ISO/IEC JTC 1/SC 6 and is subject to periodic review; consult the ISO/IEC catalogue or your national standards body for the current lifecycle status and any later revisions.

Q: Is it part of a series?

A: It is part of the ISO/IEC family of information‑technology and telecommunications standards (ICS 35.100.20) and consolidates several earlier HDLC and framing publications. It is frequently cited alongside other data‑link and framing standards when defining interoperable protocol stacks.

Q: What are the key keywords?

A: HDLC, data link layer, frame format, FCS (8/16/32‑bit), XID, address resolution, transparency, bit‑oriented, control procedures.