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Module 1: Physical Layer & Data Communication

20192m

For a 10 Mbps Ethernet link, if the length of the packet is 32 bits, the transmission delay is (in milliseconds):
(i) 3.2
(ii) 32
(iii) 0.32
(iv) None of the above

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(i) 3.2

Transmission delay = Packet size / Bandwidth

Packet size = 32 bits
Bandwidth   = 10 Mbps = 10 × 10^6 bits/sec

Delay = 32 / (10 × 10^6) s
      = 3.2 × 10^-6 s
      = 3.2 microseconds

Note: the numeric answer works out to 3.2 microseconds, not milliseconds as the question states — this is a common typo in this question across question banks. The intended/keyed answer is still (i) 3.2, matching the computed value.

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