
Configuring ATM Services
5-16
When setting the SCR for ATM FRE2 ILI pairs, keep the following in mind:
• The SCR is essentially a future average. By setting the SCR you are
specifying the cell rate, over time, to which you want the VC to conform.
• To be useful, the SCR must not exceed the PCR.
• If you know the user average rate, set the SCR about 10% higher than this
value.
• ATM FRE2 ILI pairs require a minimum SCR value of 300 cells/s. PVCs may
fail to operate with SCR values less than 300 cells/s.
When setting the SCR for ATM ARE ILI pairs, keep the following in mind:
• The SCR maps directly to the MCR.
• The MCR provides guaranteed bandwidth for PVCs and Control VCs while
allowing sufficient bandwidth for SVCs to operate.
• To be useful, the SCR must not exceed the PCR.
• If you know the user average rate, set the SCR about 10% 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 setting. Refer to
Table 5-1 for additional information.
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