BS ISO/IEC 13239:1997 Information technology — by BSI

Read or Download BS ISO/IEC 13239:1997 Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures PDF

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Extra resources for BS ISO/IEC 13239:1997 Information technology — Telecommunications and information exchange between systems — High-level data link control (HDLC) procedures

Sample text

The identity of additional I frames in need of transmission shall be indicated by either — a) one entry for every I frame in need of retransmission, or b) one entry for every standalone I frame in need of transmission plus a span list for every sequence of two or more contiguously numbered I frames in need of retransmission. A span list identifies the start and the end of a sequence of contiguously numbered I frames in need of retransmission. When the multi-selective reject procedure is employed without span lists, the information field shall be encoded such that there is one or more octets for each I frame in need of retransmission.

Each combined station shall maintain a V(S) for the I frames it transmits to the other combined station, and a V(R) for the I frames it correctly receives from the other combined station. 2 Send state variable V(S) The send state variable denotes the sequence number of the next in-sequence I frame to be transmitted. The send state variable can take the value 0 to modulus minus one inclusive (where modulus is the modulus of the sequence numbering scheme and the numbers cycle through the entire range).

Depending on the data link layer subfield, the parameter field may consist of a series of parameter identifier (PI) (1 octet), parameter length (PL) (1 octet), and parameter value (PV) (m octets) sets, one set for each defined data link layer subfield element. For multi-octet PV’s that are binary, the higher-order bits are in the first octet transmitted. When this structure is used, a data link layer subfield has the organization depicted in Figure 9. GI GL PI 1 Octet PL 1 Octet PV ... PI PL PV m Octet Where PI: Parameter identifier, expressed as a decimal value PL: Parameter length, expressed as a decimal value Figure 9 — General organization of a data link layer subfield using the PI/PL/PV structure NOTE The value of PL does not include the lengths of either itself or its associated PI.

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