I am having a hard time following this. I just cannot produce the correct answer
ID: 3751869 • Letter: I
Question
I am having a hard time following this. I just cannot produce the correct answer. Can you please not handwrite the answer and list the steps.
Q1)
How long does it take to send a 15 MiB file from Host A to Host B over a circuit-switched network, assuming:
Total link transmission rate = 96.7 Gbps.
Network is TDM, with 11 permitted users, each with an equal time slot size.
A link connection requires a setup time of 67.7 ms.
Your answer should be in miliseconds (ms) with one decimal place, and without the unit (e.g. "140.6" without the quotes)
Q2)
How long does it take to send a 13 MiB file from Host A to Host B over a circuit-switched network, assuming:
Total link transmission rate = 49.8 Gbps.
Network is FDM, with 7 permitted users, each with an equal bandwidth share.
A link connection requires a setup time of 63.3 ms.
Your answer should be in miliseconds (ms) with one decimal place, and without the unit (e.g. "140.6" without the quotes)
Explanation / Answer
Formulas:
Transmission Rate (TR) = Bit rate (R)/slots (h)
Transmission Time (TT) =size of file (x)/ Transmission Rate (R/h)
Total Time = Transmission Time + Circuit setup time
Q1) Solution:
Given,
Bits to send A to B (x) = 1.5MiB= 125829120bits or 1.258e+8 bits
Slots (h) = 11
Transmission Rate (TR) = 96.7 Gbps = 9670,00,00,000 bps or 9.67e+10 bps
Circuit Setup time = 67.7 msec
Calculations,
Transmission rate = R/ h
96700000000bps = R / 11
R = 11 (96700000000) = 1.0637e13 or 1063700000000
Transmission Time = x / TR = 125829120/96700000000
= 0.00130123185 sec = 1.301 msec
Total Time = Transmission Time + setup time
= 1.301+67.7 = 69.001 = 69.0(ans)
Q2) Solution:
Given,
Bits to send A to B (x) = 13MiB=109051904 bits
Slots (h) = 7
Transmission Rate (TR) = 49.8 Gbps = 4980,00,00,000 bps or 4.98e+10 bps
Circuit Setup time = 63.3 msec
Calculations,
Transmission rate = R/ h
49800000000 bps = R / 7
R = 7 (49800000000) = 3486000000000
Transmission Time = x / TR = 109051904 / 49800000000
= 0.00218979727 sec = 2.18979727 msec
Total Time = Transmission Time + setup time
= 2.18979727 + 63.3 = 63.3 (ans)
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