Networking Spot it

Spot the Mistake: Transmission Delay

Can you spot the mistake in this transmission delay answer?

Lesson notes

Key points

Packet length L is 1500 bytes, and link rate R is 10 Mbps, which is 10,000,000 bits per second.
Transmission delay equals L divided by R, so 1500 divided by 10,000,000 gives 0.15 milliseconds.
So the sender needs that time to push every bit of the packet onto the link.

Takeaway: Transmission delay = L ÷ R, with L in bits, not bytes.

Quick check: Which step is wrong?

Step 1
Step 2
Step 3

Bytes were divided by bits per second; L must be converted to bits first.

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