
Configuring ATM Services
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• 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 percent higher than
this value.
• ATM ARE ILI pairs and Model 5780 ATM routers 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 and Model 5780 ATM routers allow you to enter an SCR
value of 0. Entering 0 for the SCR turns off this function and specifies that the
ATM router use “best effort” for SCR.
• The E-3 framing mode setting affects the maximum SCR setting.
By default, the SCR is set to 2358 cells/s. Table 7-2 lists the valid ranges for each
Bay Networks ATM router.
For additional information about traffic parameters, refer to “ATM Traffic
Parameters” in Chapter 2.
Table 7-2. Valid SCR Ranges
ATM Routers Range (Cells/s)
ATM FRE2 OC-3 SONET/SDH ILI pairs 300 through 365566
ATM ARE OC-3 SONET/SDH ILI pairs 0, 128 through 353207
Model 5780 0, 128 through 353207
ATM ARE DS-3 ILI pairs 0, 128 through 96000
ATM ARE E-3 ILI pairs; G832 Framing Mode 0, 128 through 80000
ATM ARE E-3 ILI pairs; G751 Framing Mode 0, 128 through 72000
Site Manager: Xmit Sustainable Cell Rate (cells/s): page A-28
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