1 votes 1 votes Consider the use of 10 K-bit size frames on a 10 Mbps satellite channel with 270 ms delay. What is the link utilization for stop-and-wait ARQ technique assuming P = 10-3? My doubt - In frame size 10 K-bit, what should you take value of K? i.e K as 1000 bits or K = 1024 bits? I'm more inclined about taking K = 1024 bits, but the question's solution has K = 1000 bits! Given solution - Link utilization = (1-P) / (1+2a) Where a = (Propagation Time) / (Transmission Time) Propagation time = 270 msec Transmission time = (frame length) / (data rate) = (10 K-bit) / (10 Mbps) = 1 msec Hence, a = 270/1 = 270 Link utilization = 0.999/(1+2*270) ≈0.0018 =0.18% Computer Networks stop-and-wait computer-networks go-back-n sliding-window + – iarnav asked Nov 8, 2018 edited Nov 8, 2018 by iarnav iarnav 1.8k views answer comment Share Follow See all 6 Comments See all 6 6 Comments reply Show 3 previous comments Magma commented Nov 8, 2018 reply Follow Share data rate given as = 10 Mbps Tt = 10 x 2 10 / 10 x 106 = 1024 / 106 = 1024 x 10-6 sec Tp = 270 x 10 -3 sec Capacity of a channel = 2*Tp* BW = 2* 270 x 10 -3 * 10 x 106 = 5400 x 10 3 bit No of packets sent = 5400 x 10 3 / 10 x 210 = 527.34 = 527 packet you can send 527 packet but In stop and wait we only sent 1 packet therefore link utilization : 1/527 = 0.001897 = 0.18 % just go with the concept 1 votes 1 votes adarsh_1997 commented Nov 9, 2018 reply Follow Share @magma y u r using 2*tp*b (since it is point to point link half duplex must be used) 0 votes 0 votes askeshavas commented Oct 5, 2022 reply Follow Share WHAT IS p IN THIS QUESTION? 0 votes 0 votes Please log in or register to add a comment.
0 votes 0 votes In storage K= 1024 like in Operating System and CO in transmission K = 1000 like in Computer Networks Rustam Ali answered Nov 8, 2018 Rustam Ali comment Share Follow See all 2 Comments See all 2 2 Comments reply iarnav commented Nov 8, 2018 reply Follow Share K = 1000 like in Computer Networks even for the packet size/length? Packet contains data. 0 votes 0 votes Rustam Ali commented Nov 8, 2018 reply Follow Share refer https://gateoverflow.in/1795/gate2014-1-28 Both used but i think because we are using MKS system so better if you go with K=1000. 0 votes 0 votes Please log in or register to add a comment.