User Manual
Product information and planning
9500 MPR Rel. 3.1
3DB18809AAAA Issue 1 183/980
2.8.17 ATM Traffic Management
– Three Ethernet CoS are foreseen for ATM PW flows, derived from ATM Service Category configured
for the related VP/VC at ATM layer (by ATM Traffic Descriptor):
•CBR
• UBR+ (MDCR > 0)
•UBR
– By proper mapping of these CoSs to Core Switch and Modem Switch (refer to Figure 93.), the native
ATM QoS can be emulated.
– ATM PW flow-based packet queueing is performed inside the ASAP unit, its Ethernet flow CIR/PIR/
MBS/EBS parameters are also derived from configured ATM TD.
– ATM PW flows that have been classified as CBR and UBR+ will be subjected to admission control
and then have guaranteed bandwidth; the required bandwidth will be derived from Ethernet flow CIR,
taking in account the ATM PW encapsulation and air frame structure.
Figure 93. ATM Traffic Management - General block diagram
In Figure 94 is shown a more detailed block diagram of the ASAP unit in Ingress.
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