User's Manual

Chapter 7: Configuration
Configuring quality of service
Page 7-197
Max Burst Downlink
Data Rate
These parameters allow operators to specify the data rate at which a SM
is allowed to transmit (until burst allocation limit is reached) before
being recharged at the Sustained Downlink Data Rate with credits to
transit more. When set to 0 (default), the burst rate is unlimited.
Sustained Downlink
Data Rate
Specify the rate at which the AP is replenished with credits (tokens) for
transmission to each of the SMs in its sector. This default imposes no
restriction on the uplink. See Maximum Information Rate (MIR)
Parameters on page 7-189
 Interaction of Burst Allocation and Sustained Data Rate Settings on
page 7-191
 Configuration Source on page 7-73
Downlink Burst
Allocation
Specify the maximum amount of data to allow the AP to transmit to any
registered SM before the AP is replenished with transmission credits at
the Sustained Downlink Data Rate. See
 Maximum Information Rate (MIR) Parameters on page 7-189
 Interaction of Burst Allocation and Sustained Data Rate Settings on
page 7-191
 Configuration Source on page 7-73
Broadcast Downlink
CIR
Broadcast Downlink CIR (Committed Information Rate, a minimum)
supports system designs where downlink broadcast is desired to have
higher priority than other traffic. For many other system designs,
especially typical internet access networks, leave the Broadcast
Downlink CIR at the default.
Broadcast Downlink CIR is closely related to the Broadcast Repeat Count
parameter, which is settable in the Radio tab of the Configuration page
in the AP: when the Broadcast Repeat Count is changed, the total of
available bandwidth is also changed, since packets are being sent one,
two, or three times, according to the setting in the Broadcast Repeat
Count parameter.
Priority Precedence
Allows operator to decide if 802.1p or DiffServ priority bits must be used
first when making priority decisions.
PPPoE Control
Message Priority
Operators may configure the SM to utilize the high priority channel for
PPPoE control messages. Configuring the SM in this fashion can benefit
the continuity of PPPoE connections when there are issues with PPPoE
sessions being dropped in the network. This prioritization may be
configured in the DiffServ tab in the Configuration menu of the SM.
Prioritize TCP ACK
To reduce the likelihood of TCP acknowledgement packets being
dropped, set this parameter to Enabled. This can improve throughput
that the end user perceives during transient periods of congestion on the
link that is carrying acknowledgements.