Avaya Configuring ATM Services Manual de usuario Pagina 101

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ATM Features and Implementation Notes
5-17
Maximum Burst Size
For ATM FRE2 ILI pairs, the maximum burst size (MBS) is the maximum length
of a cell stream allowed on a particular VC. The 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, we suggest that you select a value larger than the largest
packet your PVC or Control VC can transmit (that is, the Maximum AAL CPCS
Transmit SDU size). For example, if your VC accepts packets that are less than
2358 bytes long (PVC default), set your MBS value between 45 and 50 cells.
As a guideline, use the formula below to determine your MBS value:
Note: ATM ARE ILI pairs ignore the maximum burst size.
Maximum Packet Size (in bytes)
48 bytes/cell
= MBS value (in cells)
For example:
2358 bytes (PVC default)
48 bytes/cell
= 49 cells
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