CDM-625A Advanced Satellite Modem
MN-CDM625A
Ethernet-based Remote Product Management
Revision 4
7–46
ASFD Bandwidth Mode
– Use the drop-down list to select
Datarate
or
Percentage
:
•
In the default
Datarate
mode, the minimum bandwidths for all Assured Forwarding Classes
are those that are specified in the
Service Rate (Kbps)
column.
•
In
Percentage
mode, the minimum bandwidths for all Assured Forwarding Classes are
calculated (as a percentage of modems current TX data rate) using values that are specified
in the
Service Rate (%)
column.
For the Differentiated Services tabulature – From left to right, note the following:
Column
Description
Priority
IP traffic is prioritized based upon the DSCP (DiffServ Code Points) Class Selector
Precedence.
Per-Hop Behavior (PHB)
Traffic class that determines how packets will be forwarded.
Codepoint (DSCP)
Codepoint value in Type of Service (ToS) byte in IP header.
The user has the option of configuring each queue to one of the following attributes (the
acceptable ranges are shown in brackets):
Column
Description
Service Rate (kbps)
[ -0.000 / (Tx Data Rate)]
This field is active when the ASFD Bandwidth Mode is set
to Datarate.
The minimum bandwidth will be served first among the Assured
Forwarding (ASFD) classes in case of bandwidth availability once Class Selector 7
through Class Selected 1 have been serviced.
Service Rate (%)
This field is active when the ASFD Bandwidth Mode is set to Percentage.
This
column is for specifying the minimum service rates (for the Assured Forwarding
Classes) as a percentage of modem's current Tx data rate. These minimums are
served in case of bandwidth availability once Class Selector 7 through Class
Selector 1 has been serviced. This is very handy for ACM links where the modem
Tx data rate varies.
Drop Preferences
ASFD Class 4 through 1 Code Points (b100xx0, b011xx0, b010xx0, and b001xx0)
carry the drop precedence value (xx). In case of network congestion, a Weighted
Random Early Detection (WRED) congestion avoidance algorithm is imposed on
these queues to drop the packets randomly rather than ‘tail drop.’
•
Low Drop Precedence (% full) [0
–
100]
– In case of congestion, the WRED
is applied after the queue depth exceeds the configured percentage value
assigned for the Drop Precedence value b001.
•
Med. Drop Precedence (% full) [0
–
99]
– In case of congestion, the WRED
is applied after the queue depth exceeds the configured percentage value
assigned for the Drop Precedence value b010.
•
High Drop Precedence (% full)) [0
–
99]
– In case of congestion, the WRED
is applied after the queue depth exceeds the configured percentage value
assigned for the Drop Precedence value b011.
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Содержание CDM-625A
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Страница 118: ...CDM 625A Advanced Satellite Modem MN CDM625A Updating Firmware Revision 4 4 14 Notes...
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Страница 314: ...CDM 625A Advanced Satellite Modem MN CDM625A Ethernet based Remote Product Management Revision 4 7 84 Notes...
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Страница 756: ...2114 WEST 7TH STREET TEMPE ARIZONA 85281 USA 480 333 2200 PHONE 480 333 2161 FAX...