AS 3511-1987

1 - AS 3511-1987 INFORMATION PROCESSING SYSTEMS-DATA COMMUNICATION-MULTILINK PROCEDURES (ISO 7478)
4 - PREFACE
5 - Contents
7 - 0 Introduction
7 - 1 Scope and field of application
7 - 2 Definitions and parameters
7 - 2.1 MLP reset confirmation bit (C) :
7 - 2.2 multilink procedures (MLP) :
7 - 2.3 multilink send sequence number [MN(S)] :
7 - 2.4 lost multilink frame timer (MT1) :
7 - 2.5 group busy timer (MT2) :
7 - 2.6 MLP reset confirmation timer (MT3) :
8 - 2.7 multilink receive state variable [MV(R)] :
8 - 2.8 multilink send state variable (MV(S)] :
8 - 2.9 multilink frame acknowledgment state variable [MV(T)]
8 - 2.10 multilink window size (MW) :
8 - 2.11 receive MLP window guard (MX) :
8 - 2.12 range of abnormal multilink frames (MZ) :
8 - 2.13 number of SLP retransmission attempts (N) :
9 - 2.14 MLP reset request bit (R) :
9 - 2.15 sequence check option bit (S) :
9 - 2.16 single link procedures (SLP) :
9 - 2.17 void sequencing bit (V) :
9 - 3 Multilink frame format
9 - 4 Transmitter operation
9 - 4.1 General
9 - 4.2 Transmission of multilink frames
11 - 4.3 Transmitter flow control
11 - 4.4 Retransmission
11 - 4.5 Link failure
11 - 4.6 Transmitter reconfiguration
12 - 5 Receiver operation
12 - 5.1 General
12 - 5.2 Reception of multilink frames
12 - 5.3 Resequencing
13 - 5.4 Detecting lost multilink frames
14 - 5.5 Receiver flow control
14 - 6 Initializing the MLP
14 - 7 Resetting the MLP
16 - Annex - Examples of multilink resetting procedures
16 - A.1 Introduction
16 - A.2 MLP reset initiated by a single station
17 - A.3 MLP reset initiated by both stations simultaneously

Specifies multilink procedures where a multiplicity of parallel data links at the data link layer are used to provide a variable bandwidth data link between network layer entities. The multilink procedures (MLP) exist as a new upper sublayer of the data link layer, operating between the network layer and a multiplicity of single data link protocol functions (SLPs) in the data link layer. This Standard does not specify the way in which the SLPs indicate to the MLP that the transmission of a multilink frame has successfully been completed. Technically identical with ISO 7478:1987.

This International Standard specifies multilink procedures where a multiplicity of parallel data links at the data link layer are used to provide a variable bandwidth data link between network layer entities. The multilink procedures (MLP) exist as a new upper sublayer of the data link layer, operating between the network layer and a multiplicity of single data link protocol functions (SLPs) in the data link layer (see figure 1).This International Standard does not specify the way in which the SLPs indicate to the MLP that the transmission of a multilink frame has successfully been completed.These multilink procedures do not preclude the use of different single link procedures, each with differing delay characteristics and/or line speeds to form one multilink group.When the procedures defined by this International Standard are to be used on one or more parallel data links, both ends of the data link must know that these procedures are to be used before the first multilink frame is sent. This could be achieved by a prior agreement that all communications on this data link will use these procedures, or by one of the SLPs negotiating the use of these procedures, or by some other means. The method by which both ends achieve a common understanding as to the use or non-use of these multilink procedures is not defined in this International Standard.