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VSC7440 Datasheet(PDF) 243 Page - Microsemi Corporation

Part # VSC7440
Description  L2/L3 Enterprise Gigabit Ethernet Switch with 10 Gbps Links
PDF  444 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

VSC7440 Datasheet(HTML) 243 Page - Microsemi Corporation

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Functional Descriptions
VMDS-10492 VSC7440 Datasheet Revision 4.2
226
Figure 67 •
Default Scheduling Hierarchy
3.24.7.3 Bandwidth Control
Each scheduler element has a dual leaky bucket shaper on its output, which may block further
transmissions from that scheduler element. It is controlled through a leaky bucket system, filling the
bucket when data is transmitted, and leaking it at the configured rate. The bucket is closed when more
data than the configured burst capacity has been filled into it.
The shaper has three rate modes that define what is added to a bucket:
•
Bits transmitted excluding IFG
•
Bits transmitted including IFG
•
Frames transmitted
Each of the three layers have four linked lists configured. All scheduling elements with active shapers
must be members of one of those. Each linked list is processed once every configurable interval. When a
list is processed, all shapers in it will leak its configured rate setting.
Examples:
layer 0
SE
#112
SE
#114
SE
#116
SE
#118
15 queues, src
x,
dst 7, iprio 3
SE
#120
SE
#122
SE
#124
SE
#126
layer 1
SE #7
SE #7
layer 2



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