Avaya Configuring ATM Services Manual do Utilizador Página 108

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Configuring ATM Services
7-6 114056 Rev. A
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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