# CSMA/CD

823 views

In standard ethernet with transmission rate of 20 Mbps, the length of the cables is 2500 m and the size of frame is 512 bits. The propagation speed of a signal in a cable is 2 × 108 m/s. The percentage of the time channel is idle or not used by a station is _________ (in approximate integer value).

0
i'm getting 24.12 %
0
A short explanation would be highly appreciated :)
0
@Pawan Kumar  So ,  Percentage of time channel is idle = percentage of time station are doing useful work ?  I do get efficiency as 24.12% approx for this but I am confused what is asked in question here ?
0

Pawan Kumar 2  VS    It must be 100- efficiency?

Please correct me if I am wrong!

1
Yes it should be 100-efficiency
0

I am getting 76% please tell whether its correct

Idle channel % = 100 - efficiency

which is 100 - $\frac{Tt}{e*2Tp + Tt + Tp}$

## Related questions

1
59 views
If CSMA transmits 8 stations network data in single channel whats is the chip code for station 5 {Assume that W1=[+1]} how to solve it solution given is. 1111-1-1-1-1.