A 1-km-long, 10-Mbps CSMA/CD LAN (i.e., Classic Ethernet)has a propagation speed of 200 m/μsec (i.e., how fast the radio signal moves on the link). Thereare no repeaters in this system. Data frames are 512 bits long, including 480 bits of payload (i.e.,effective data) and 32 bits of overhead (e.g., header, checksum, and other overhead fields). Everydata frame should be confirmed by a 64-bit ACK frame. We assume the sender needs to use onecontention slot to seize the channel before transmitting the data frame, and the receiver needsto use one contention slot to seize the channel before transmitting the ACK frame. Answer thefollowing questions: a. What is the minimum length of a contention slot in μsec? b. What is the effective data rate for the sender to send one data frame? Assume that there areno collisions. Show the calculation c. What would be the impact on the total delay and the effective data rate if we used a longerdata payload size in the data frame? Given one application scenario where such change isuseful.
A 1-km-long, 10-Mbps CSMA/CD LAN (i.e., Classic Ethernet)
has a propagation speed of 200 m/μsec (i.e., how fast the radio signal moves on the link). There
are no repeaters in this system. Data frames are 512 bits long, including 480 bits of payload (i.e.,
effective data) and 32 bits of overhead (e.g., header, checksum, and other overhead fields). Every
data frame should be confirmed by a 64-bit ACK frame. We assume the sender needs to use one
contention slot to seize the channel before transmitting the data frame, and the receiver needs
to use one contention slot to seize the channel before transmitting the ACK frame. Answer the
following questions:
a. What is the minimum length of a contention slot in μsec?
b. What is the effective data rate for the sender to send one data frame? Assume that there are
no collisions. Show the calculation
c. What would be the impact on the total delay and the effective data rate if we used a longer
data payload size in the data frame? Given one application scenario where such change is
useful.
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