By ISO/IEC/JTC 1/SC 6
This overseas average specifies the body buildings, the weather of systems, the sessions of approaches, the content material and layout of the overall function alternate identity (XID) body, and a way for resolution/negotiation of an information hyperlink layer handle in switched environments for facts communique structures utilizing bit-oriented high-level info hyperlink keep watch over (HDLC) procedures.The body constitution element defines the relative positions of many of the elements of the fundamental body layout and the nonbasic body layout. The mechanisms used to accomplish bit trend independence (transparency), the place and whilst required, in the body also are outlined. furthermore, 3 body checking sequences (FCS) are detailed; the principles for handle box extension are outlined; and the addressing conventions on hand are described.The parts of strategies component specifies components of knowledge hyperlink keep an eye on approaches for synchronous or start/stop, code-transparent info transmission utilizing self reliant body numbering in either directions.These HDLC parts of methods are outlined particularly by way of the activities that happen on receipt of instructions at a secondary station, a tributary station, a peer station, or a mixed station.This overseas typical is meant to hide quite a lot of purposes; for instance one-way, two-way trade or two-way simultaneous info communique among information stations that are frequently buffered, together with operations on types of facts circuits; for instance multipoint/point-to-point, duplex/half-duplex, switched/non-switched, synchronous/start-stop, etc.The outlined parts of techniques are to be regarded as a standard foundation for setting up sorts of facts hyperlink keep an eye on tactics. This overseas common doesn't outline any unmarried method and shouldn't be considered as a specification for a knowledge communique method. no longer the entire instructions or responses are required for any specific process implementation.The sessions of techniques component describes the HDLC unbalanced periods of tactics, the HDLC balanced classification of systems, and the HDLC connectionless periods of techniques for synchronous or start/stop information transmission.For the unbalanced sessions, the knowledge hyperlink involves a chief station plus a number of secondary stations and operates in both the conventional reaction mode or the asynchronous reaction mode in a point-to-point or multipoint configuration. For the balanced category, the knowledge hyperlink includes mixed stations and operates within the asynchronous balanced mode in a point-to-point configuration. For the unbalanced connectionless classification, the information hyperlink comprises a keep watch over station plus a number of tributary stations and operates within the unbalanced connectionless-mode in a point-to-point or multipoint configuration. For the balanced connectionless type, the knowledge hyperlink comprises peer stations and operates within the balanced connectionless-mode in a point-to-point configuration. In each one type, a simple repertoire of instructions and responses is outlined, however the potential of the knowledge hyperlink could be converted by means of not obligatory functions.Balanced operation is meant to be used in conditions which require equivalent keep watch over at both finish of the knowledge hyperlink. Operational requisites are lined based on the general HDLC architecture.The content material and structure of the alternate identity (XID) body element builds at the indisputable fact that the vital use of the XID body is to interchange information hyperlink info among or extra HDLC stations. For the aim of this foreign average, info hyperlink info shall comprise any and all crucial operational features comparable to id, authentication and/or collection of not obligatory capabilities and amenities bearing on each one station. This overseas usual defines a single-exchange negotiation process for developing operational features while both a number of stations are able to offering a number of se
Read or Download ISO/IEC 13239:2002 Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures PDF
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Additional resources for ISO/IEC 13239:2002 Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures
4. 4. I frames that may have been transmitted following the I frame(s) indicated by a SREJ frame shall not be retransmitted as the result of receiving a SREJ frame. Additional I frames awaiting initial transmission may be transmitted following the retransmission of the specific I frame(s) requested by all of the SREJ frames received. 3 Unnumbered format commands and responses Unnumbered, U, commands and responses shall be used to extend the number of data link control functions. Frames transmitted with the U format shall not increment the state variables at either the transmitting or the receiving data station.
The secondary station shall, however, be permitted to accept information in UI command frames and to transmit information in UI response frames. The secondary station has normal mode respond opportunity and shall initiate a single frame response transmission, indicating its status, as a result of receiving a command frame with the P bit set to "1"; optionally, it may initiate such a response as the result of receiving a UP command with the P bit set to "0". In this mode, a secondary station shall action only mode setting, XID, UI and TEST commands.
Frames transmitted with the U format shall not increment the state variables at either the transmitting or the receiving data station. Five "modifier" bits are provided which allow up to 32 additional command functions and 32 additional response functions to be defined. Fifteen command functions and nine response functions are defined below; all others are reserved. The encoding of the U format command/response control field shall be as shown in figure 6. 1. 2. 1 Information field structure The general structure of the optional information field is illustrated in figure 7.
ISO/IEC 13239:2002 Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures by ISO/IEC/JTC 1/SC 6