## Thursday, December 5, 2019

### Networking Topologies Authorization and Transaction

Question: Discuss about theNetworking Topologiesfor Authorization and Transaction. Answer: Given, B= 6.8 MHz (bandwidth) SNR= 132 (signal to noise ratio) C= Bit Rate. C=B log (1+SNR) = 6.8x106 log2 (1+132) = 6.8x106 log2 133 = 48 Mbps. Let, L be the number of signals Therefore, C = 2 x B x log2 (L) 0r, 48= 2x6.8xlog2L Or, log2 L=48/ (6.8x2) Or, log2 L= 3.56 0r 4 (approximately) Or, L = 24= 16. Given, Frame size = 5 million bits Propagation speed = 2.2x 108 m/s Length of the link = 1900 km = 1900 x 103 Therefore, Processing delay = 1.8 x 10 mS = 18 mS. Bandwidth = 8 x 106 bps Therefore, Transmission time = 5 x 106 /8 mS = 62500 =.625 s Queuing time= 10 x 3.5 mS = 35 mS. Propagation time = 1900 x 103 / 2.2x 108 uS = 8 uS Total delay time = 35 + 18 + .08 + 62500 = 62551.08 mS = .63 sec The total delay time is .63 sec. The dominant component is the transmission delay. The negligible component is the propagation time. Figure 1. The POP 3 State diagram Source: (created by Author) The POP 3 protocol has four states: Authorization, Transaction, Update, Closed After the Authorization of connection the connection is established. After the establishment of the connection the transactions take places. After the completion of the transactions they are updated. On completion of the update the POP 3 is closed. Bibliography Bajde, D. (2013). Consumer culture theory (re) visits actornetwork theory: Flattening Holme, P. (2015). Modern temporal network theory: a colloquium.The European Physical Journal B,88(9), 1-30. Huang, X., An, H., Gao, X., Hao, X., Liu, P. (2015). Multiresolution transmission of the correlation modes between bivariate time series based on complex network theory.Physica A: Statistical Mechanics and Its Applications,428, 493-506. Ors, R. (2014). Advances on tensor network theory: symmetries, fermions, entanglement, and holography.arXiv preprint arXiv:1407.6552.