HDLC reliability and the FRBS method to improve it

Abstract

In view that some international bodies in the field of Telecontrol systems propose reliability requirements for line protocols which are not fulfilled by standard HDLC,here a detailed analysis of the reliability of HDLC is given and the statistical properties of sequences using the Bit Insertion Mechanism are analyzed. The final result is a proposal of a method,the Four Redundancy Bit Sequence method: (FRBS),which seems able to be added without much trouble before and after the HDLC layer to yield a protocol with the desired characteristics.