
Concept explainers
Assume we have a very slow medium which can send bits at the rate of 1 bit per second.
Host A has to send bits 101, starting at t=0 Host B has to send bits 111, starting at t=0 Host C has to send bits 011, starting at t=0
- Using TDMA (Time Division Multiple Access), with the order ABC, what is the signal sent over the wire? Fill in the slot owner as A, B, or C. Fill in each slot in the table with 0 for 0 1 for 1 or for no bit (There may be extra slots in the table at the end; simply leave them blank) (table will be in the answer section)
- A wasted slot is a slot where there is a node with data to send but no node is sending any data. A used slot is a slot containing data. How many wasted slots are there? What is the efficiency?
(efficiency = used slots / (wasted slots + used slots)
3. Assume all the information is the same as the previous question except: Host A has to send bits 101, starting at t=1
Host B has to send bits 111, starting at t=2 Host C has to send bits 011, starting at t=5 Fill out the table again:
4. How many wasted slots are there? What is the efficiency?
5. Assume all the information is the same as the previous question except: Host A has to send bits 101, starting at t=0
Host B has to send bits 111, starting at t=0
Host C has nothing to send Fill out the table again:
6. How many wasted slots are there? What is the efficiency?

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