
Configuring ATM Services
A-30 114056 Rev. A
Parameter: Xmit Burst Size (cells)
Path: Configuration Manager > Protocols > ATM > Service Records
> PVC
Default: 40
Options: 1 through 65535
Function: For ATM FRE2 ILI pairs, the maximum burst size (MBS) is the maximum
length of a cell stream on a particular VC. The MBS specifies the maximum
number of sequential cells allowed on a VC, at the peak cell rate, before the VC
must relinquish bandwidth to other VCs.
When you set 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.
Instructions: Set a value in the specified range.
MIB Object ID: 1.3.6.1.4.1.18.3.4.23.1.5.1.10
Note: ATM ARE ILI pairs and Model 5780 ATM routers ignore the maximum
burst size.
Parameter: Maximum AAL CPCS Transmit SDU Size
Path: Configuration Manager > Protocols > ATM > Service Records
> PVC
Default: 4608
Options: 1 through 65535
Function: Specifies the maximum AAL CPCS SDU size, in bytes, that this VC supports in
the transmit direction.
Instructions: Enter an octet value that represents the maximum packet size you intend this VC
to transmit. We suggest that you accept the default value of 4608 bytes. Most
packets fall well within this limit.
MIB Object ID: 1.3.6.1.4.1.18.3.4.23.1.5.1.17
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