Specifications

8-3
Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
OL-1166-04
Chapter 8 Cisco IGX 8400 Series ATM Service
ATM Service—Functional Overview
Figure 8-1 Service Template Overview
Qbins
Qbins store cells and serve them to an interface based on bandwidth availability and CoS priority (see
Figure 8-2. For example, if CBR and ABR cells must exit the switch from the same interface, but the
interface is already transmitting CBR cells from another source, the newly-arrived CBR and ABR cells
are held in the Qbin associated with that interface. As the interface becomes accessible, the Qbin passes
CBR cells to the interface for transmission. After the CBR cells have been transmitted, the ABR cells
are passed to the interface and transmitted to their destination.
SC means for service class. Each preconfigured template is one of the
above for each of 9 service templates (VC database + Qbin (10-15).)
SC database 1
SC database 2
SC database 3
SC database 23
Qbin 10
Qbin 11
Qbin 15
SC database per template
Qbin databases per VC database
Preconfigured
service class
templates
on NPM (1-9)
Template values on UXM
initialized by internal IGX protocol
messages at card activation
VC
descriptor
templates
CoS buffer
descriptor
templates
Master SCT copies on UXM
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