Abstract
HDLC (High-level Data Link Control) protocol is the most fundamental error-and flow control procedure used in data communications for a single physical channel. Moreover HDLC is bit-oriented synchronous, data-framing, switched and non-switched data link layer (layer 2) protocol. Apart from the classical HDLC standard of ISO, the generic recovery mechanisms of this protocol constitute the basis for a whole family of data link protocols designed for wired and wireless systems. The following work presents a series of detailed analytic studies on performance modelling and evaluation of an HDLC-controlled link wherein various retransmission options and traffic scenarios are considered. The goal of the analysis is the mean link throughput and mean frame flow time computation with respect to a set of link and protocol parameters, as frame length, window size, duration of time-outs for a given bit-error probability, channel load and distance between communicating stations.
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