.M. Zin, A, S M. Idrus, Rizwan A. Butt, and A Ramli. 2018. “Impact of Reciever on Time on the Energy Saving Performance of the Watchful Sleep Mode in a Passive Optical Network”. International Journal of Engineering & Technology 7 (3.14): 410-13. https://doi.org/10.14419/ijet.v7i3.14.18828.