
Customizing PVC Service Records and PVCs
117374-C Rev 00
6-15
Setting the MBS
The maximum burst size (MBS) specifies the maximum number of sequential
cells allowed on a VC before that VC must relinquish bandwidth to other VCs
waiting to transmit. This burst occurs at or close to the peak cell rate.
When setting the MBS, you should select a value larger than the largest packet
that the PVC can transmit (that is, the size of the maximum AAL CPCS transmit
SDU). For example, if your PVC accepts packets that are less than 4608 bytes
long (PVC default), set your MBS value between 45 and 50 cells.
By default, the MBS is set to 40 cells. However, you can set the MBS to any value
from 1 to 65,535 cells.
For additional information about the MBS, see “Using the MBS” on page 1-26.
For information about setting the maximum AAL CPCS transmit SDU size, see
“Modifying the Maximum AAL CPCS SDU Size
” on page 6-17.
Using the BCC
To change the PVC MBS value, navigate to the PVC prompt (for example,
box; atm/11/1; pvc-service/boston; pvc/11/1/0/32
) and enter:
tx-burst-size
<integer>
integer
is the MBS value that you want the PVC to use.
For example, the following command changes the PVC MBS value to 80 cells:
pvc/11/1/0/32# tx-burst-size 80
pvc/11/1/0/32#
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