Strict Prioritization; Figure 5-10. Strict Prioritization Concept Diagram - ADTRAN Total Access 1240 Installation And Maintenance Practice

Section 5, User Interface - Menu Descriptions

Strict Prioritization

There are four available virtual circuits (VCs) per SHDSL loop that can be prioritized on a
strict prioritization basis. This means that any available high priority VC traffic gets queued
into the ATM/SHDSL pipe first followed by traffic at the next highest priority class, and so on,
to the lowest priority class (see Figure 5-10). If a priority class contains no elements, it is
bypassed but always considered for the next queueing sequence. Prioritization only applies to
egress traffic of the subscriber (SHDSL) ports.
As described above Four VCs can be configured on each SHDSL port. There are four priority
settings: High = CBR, MidH = VBRrt, MidL = VBR, and Low = UBR. There are no rate settings
for the cbr, vbrrt, and vbr configurations, therefore, these ATM Class of Service (COS) prior-
ities have been redefined as High, MidH, MidL, and Low priorities.
Total Access 1240
VC
Strict Prioritization
SHDSL
Loop Bandwidth
SHDSL Port 12
SHDSL ports 1-24

Figure 5-10. Strict Prioritization Concept Diagram

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