Question

Describe about peak cell rate (pcr) and sustained cell rate (scr)

Answer 1

Traffic Parameters

These are the parameters that control the flow of ATM traffic.

Peak Cell Rate (PCR)

Peak Cell Rate (PCR) is the maximum rate at which the sender can send cells. This parameter

may be lower (but not higher) than the maximum line speed. 1 ATM cell is 53 bytes (424 bits),

so a maximum speed of 832Kbps gives a maximum PCR of 1962 cells/sec. This rate is not

guaranteed because it is dependent on the line speed.

Sustained Cell Rate (SCR)

Sustained Cell Rate (SCR) is the mean cell rate of each bursty traffic source. It specifies the

maximum average rate at which cells can be sent over the virtual connection. SCR may not be

greater than the PCR.

Maximum Burst Size (MBS)

Maximum Burst Size (MBS) is the maximum number of cells that can be sent at the PCR.

After MBS is reached, cell rates fall below SCR until cell rate averages to the SCR again. At

this time, more cells (up to the MBS) can be sent at the PCR again.

Minimum Cell Rate (MCR)

Minimum Cell Rate (MCR) is the minimum rate at which the sender can send cells


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