ISO IEC 4335-1993 PDF

Full title and description

ISO/IEC 4335:1993 — Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures — Elements of procedures. Specifies the elements of data link control procedures for synchronous or start/stop, code‑transparent data transmission using the HDLC frame structure and independent frame numbering in both directions.

Abstract

This standard defines the HDLC elements of procedures in terms of the actions that occur on receipt of commands at a secondary station or a combined station. It covers procedures applicable to synchronous and start/stop (asynchronous) code‑transparent transmission and is intended as a common basis for establishing various data link control procedures.

General information

• Status: Withdrawn / Annulled.
• Publication date: Published December 23, 1993 (Edition 5, 1993).
• Publisher: ISO / IEC (ISO/IEC JTC 1/SC 6).
• ICS / categories: 35.100.20 (Data link layer).
• Edition / version: Edition 5 (1993).
• Number of pages: 42 pages.

Scope

Defines the procedural elements for HDLC data link control used for synchronous or start/stop, code‑transparent data transmission, employing the HDLC frame structure and independent frame numbering in both directions. The standard specifies the actions taken at secondary or combined stations on receipt of commands and provides a common set of procedural elements that may be used to build specific data link control procedures. (This specification was later consolidated into a newer HDLC standard.)

Key topics and requirements

• Elements of HDLC procedures: definitions of command/response behaviour at secondary and combined stations.
• Support for synchronous and start/stop (asynchronous) code‑transparent transmission.
• Use of HDLC frame structure and conventions (frames, flags, FCS as defined in companion frame‑structure standards).
• Independent frame numbering in both directions and sequence‑management actions (retransmission, acknowledgment handling).
• Optional functions and classes of procedures expressed so implementations can select a subset appropriate to an application.
• Interoperability focus: provides common procedural building blocks rather than a single monolithic system specification.

Typical use and users

Typical users include protocol and firmware implementers for telecommunications and networking equipment (routers, WAN interfaces, embedded communications devices), standards developers, test laboratories, and academic researchers working with data link layer protocol behaviour and interoperability. The content is intended for engineers implementing or testing HDLC‑based links and for architects defining derived or application‑specific link procedures.

Related standards

Closely related documents include ISO/IEC 3309 (HDLC frame structure) and the later consolidated HDLC procedures standard ISO/IEC 13239 (which replaced ISO/IEC 4335). ISO/IEC 4335 (earlier editions and amendments) are part of the historical HDLC family of specifications that were consolidated into ISO/IEC 13239:2002.

Keywords

HDLC, data link control, frame structure, frame numbering, synchronous transmission, start/stop (asynchronous), code‑transparent, procedures, ISO/IEC JTC 1/SC 6, withdrawn, ISO/IEC 13239.

FAQ

Q: What is this standard?

A: ISO/IEC 4335:1993 is an international standard that specified the elements of High‑Level Data Link Control (HDLC) procedures — i.e., the procedural actions and command/response behaviour at HDLC stations.

Q: What does it cover?

A: It covers procedural elements for data link control using the HDLC frame structure for synchronous or start/stop code‑transparent transmission, including independent frame numbering and the actions taken on receipt of commands at secondary or combined stations.

Q: Who typically uses it?

A: Protocol implementers, firmware and networking equipment engineers, test labs, and standards authors—anyone implementing or validating HDLC‑based data link behaviour.

Q: Is it current or superseded?

A: ISO/IEC 4335:1993 has been withdrawn and was superseded by ISO/IEC 13239 (consolidated HDLC procedures), so it is no longer the current normative reference.

Q: Is it part of a series?

A: Yes — it formed part of the family of HDLC specifications (frame structure, classes of procedures, elements of procedures, etc.) that were produced by ISO/IEC JTC 1/SC 6; these were later consolidated into ISO/IEC 13239.

Q: What are the key keywords?

A: HDLC, data link control, frame, frame numbering, synchronous, asynchronous, code‑transparent, ISO/IEC 4335, ISO/IEC 13239.