M. Jaber I, Abdul Ghani Y. Requirement for High-Availability Communication Systems. J. eng. sustain. dev. [Internet]. 2010 Dec. 1 [cited 2025 Apr. 19];14(4):109-18. Available from: https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1431