A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the throughput if the system (all stations together) produces 250 frames per second?(a) 38 frames(b) 48 frames(c) 96 frames(d) 126 framesThis question was addressed to me in examination.My doubt stems from Layers in chapter Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security

A pure ALOHA network transmits 200-bit frames on a shared channel of 2

1.	A pure ALOHA network transmits 200-bit frames on a shared channel of 200 kbps. What is the throughput if the system (all stations together) produces 250 frames per second?(a) 38 frames(b) 48 frames(c) 96 frames(d) 126 framesThis question was addressed to me in examination.My doubt stems from Layers in chapter Cryptography Overview, TCP/IP and Communication Networks of Cryptograph & Network Security
Answer» Correct choice is (a) 38 frames For explanation I would say: If the system creates 250 frames PER second, or 1/4 frames per millisecond, then G = ¼. S = G× e−2G = 0.152 (15.2 percent). This MEANS that Throughput = 250 × 0.152 = 38. Only 38 frames out of 250 will probably SURVIVE.

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