Filter
Top Products
WebShare 141W
A02-RA141-W54 Pag. 41
an ATM network. This agreement helps eliminate congestion, which is important
for transmission of real time data such as audio and video connections.
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 832 Kbps 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) is the mean cell rate of a bursty, on-off traffic source
that can be sent at the peak rate, and a parameter for burst-type traffic. SCR may
not be greater than the PCR; the system default is 0 cells/sec.
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.The following figure illustrates the relationship between PCR, SCR and
MBS.