IMPROVEMENTS IN ERROR IMMUNITY OF SYNCHRONOUS DIGITAL HIERARCHY (SDH) POINTERS

Document Type : Original Article

Authors

1 Eng. Hamdy ElTaweel, Egyptian Army.

2 Ass. Prof. Dr. Refat ElZonfoly, Telecommunications National Institute, Cairo, Egypt.

3 Ass. Prof. Dr. Ali ElMoghazy, Egyptian Army.

4 Prof. Dr. Hamdy ElMekaty, Faculty of Engineering, ElMansoura University.

Abstract

In this paper, a modified way to improve the immunity of the SDH pointers against communication errors is proposed. The compatibility between the current systems and those utilizing the proposed way is considered. A simulation program for a communication channel utilizing the SDH technique is developed. The simulation results for both the International Telecommunication Union Tele-communication standardization section (ITU-T) recommended way and the modified one are presented. The obtained result asserts that the proposed way is superior to the ITU-T recommended one. A mathematical derivation for the improvement factor of the probability to interpret an erroneous pointer in the SDH network utilizing the ITU-T recommendations and that utilizing the proposed way is carried out in both the steady state and at the beginning of new data.

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