In spite of the theoretical error detecting capability of its CRC, the actual
degree of data integrity provided by HDLC is quite low .
The paper gives a quantitative assessment of HDLC's deficiencies and of their reasons, paying particular attention to actual applications of the HDLC family of standards.
Finally, we look at some strategies that have been suggested to allow the use of HDLC in the most demanding applications
The paper presents a new version of the CSMA algorithm which improves the performances of 1-persistent CSMA without the need of collision detection, and without any rescheduling of frames, and thus any waste of bandwidth. Performances are evaluated both through experimental data and through a mathematical argument, which explains the reasons of the improvement.
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