QOS Formulas Simplified

Question 1

Formula to calculate Tc

Answer 1

( Bc /CIR ) × 1000

Question 2

Formula to calculate Bc

Answer 2

CIR × (Tc / 1000)

Question 3

What is the formula to find the number of Tc’s in 1 second?

Answer 3

1000 ms / Tc

Question 4

Formula to determine how many packets conform within each Tc?

Answer 4

Bc / packet size

Question 5

What is the formula to find out how many packets would be sent in 1 second?

Answer 5

Number of packets that conform within each Tc × number of Tc’s per second

Question 6

Formula to determine the CIR

Answer 6

Packets per second × Packet size in bits

Question 7

Formula to calculate the time interval it would take for 1000 packets to be sent at interface line rate?

Answer 7

( Bc / Interface speed ) × 1000