Avaya Configuring ATM Services Manual de usuario Pagina 107

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Customizing PVCs
114056 Rev. A 7-5
Setting the SCR
For ATM FRE2 ILI pairs, the SCR is the upper bound on the conforming average
rate of an individual PVC or control VC. In this definition, average rate is the
number of cells transmitted over the link divided by the duration of the
connection. The duration of the connection equals the total amount of time it takes
from connection setup to connection release.
The SCR allows you to define future cell flow on a PVC or control VC in greater
detail than by just using the PCR. For ATM FRE2 ILI pairs, the SCR controls the
rate over time -- not at a specific instant of time -- and can help you more
efficiently use your network resources. In other words, the SCR allows sufficient
bandwidth for operation, but does not allow a bandwidth as high as the PCR.
For ATM ARE ILI pairs and Model 5780 ATM routers, the SCR value maps
directly to a minimum cell rate (MCR) value. In other words, when you configure
the SCR on one of these devices, you actually configure the MCR. Instead of
defining the upper bound of an average rate, like the SCR, the MCR defines the
minimum amount of guaranteed bandwidth allowed for PVCs and control VCs on
the ATM line.
The MCR (that is, SCR) not only controls the rate over time, it guarantees this
rate. In other words, the SCR provides sufficient bandwidth for SVC operation
but, at the same time, guarantees the bandwidth for PVCs and control VCs on the
ATM line.
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 percent 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 and Model 5780 ATM routers, keep
the following in mind:
The SCR maps directly to the MCR.
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