$[15$ Points$]$ Question $5$: Answer the following

A$.[3$ Points$]$ Stations in a pure Aloha network send frames of size $1000$ bits at the rate of $1Mbps.$

What is the vulnerable time for this network?

Solution

B$.[3$ Points$]$ Stations in an slotted Aloha network send frames of size $1000$ bits at the rate of $1$

Mbps$.$ What is the vulnerable time for this network?

Solution

C$.[4$ Points$]$ How do we interpret success of data transfer in an Aloha and CSMA$/$CD networks?

Solution ${?}_{(})$

D$.[5$ Points$]$ Check to see if the following set of chips can belong to an orthogonal system.

$+1,+1,+1,+1$

$+1,-1,-1,+1$

$-1,+1,+1,-1$

$+1,-1,-1,+1$

Solution