Avaya Configuring ATM Services Manual do Utilizador descarregar pdf (Página 178)

Configuring ATM Services

8-24

• If you know the user average rate, set the SCR about 10 percent

higher than this value.

• ATM ARE ILI pairs require a minimum SCR value of 128 cells/s.

VCs may fail to operate with SCR values less than 128 cells/s.

• ATM ARE ILI pairs allow you to enter an SCR value of 0. Entering 0

for the SCR turns off this function.

• The E-3 framing mode setting affects the maximum SCR.

Instructions: After you determine the transmission rate of your ATM device, set the

sustainable cell rate within the range speciﬁed above. For ATM ARE ILI

pairs, you can enter 0 to turn off this function.

MIB Object ID: 1.3.6.1.4.1.18.3.4.23.1.5.1.9

Parameter: Xmit Burst Size (cells)

Default: 40

Range: 1 to 65535

Function: For ATM FRE2 ILI pairs, the Maximum Burst Size 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 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.

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 ignore the maximum burst size.

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Avaya Configuring ATM Services Manual do Utilizador Página 178