User manual

AN-80i User Manual
70-00072-01-10 Proprietary Redline Communications © 2011 Page 63 of 152 March 2, 2011
Wireless Traffic Parameters
DL QoS Level: Enter the QoS level for downlink unicast traffic for this connection.
UL QoS Level: Enter the QoS level for uplink unicast traffic for this connection.
It is strongly recommended to calculate QoS levels using the Redline PMP Configuration
Tool (contact your Redline representative to obtain a copy of this tool). The sector
controller allocates bandwidth for all subscribers using the Weighted Round Robin
algorithm with the combined total of all QoS levels acting as weights. The aggregate
QoS settings affect packet delay and jitter values for the entire sector.
To estimate these settings, identify the maximum UL and DL burst rate required for any
connection on the wireless link, and then calculate the highest available level using the
formula 'Burst Rate - 1'.
DL PIR: Enter the peak information rate for downlink traffic (50 - 50000 Kbps).
UL PIR: Enter the peak information rate for uplink traffic (50 - 50000 Kbps).
The amount of data each connection transmits over the wireless interface is monitored
and PIR settings are enforced. The metered interval is a common one-second (clock
tick) and the statistics for all connections are reset at the beginning of each interval. If
the maximum throughput is reached before the end of the current interval, that
connection is excluded from sending additional data until the next clock tick.
For example, if a connection transmits its full data allocation in the first 650 ms of the
current metering interval, the connection will receive no additional bandwidth allocation
until the next clock tick (a forced pause of 350 ms).
A single PIR setting is applied for each Group. When adaptive modulation is enabled,
automatic adjustments to the modulation/coding will result in relative changes to the PIR
of all connections using that wireless link. Incorrect PIR settings may result in excessive
latency or dropped packets (buffer full condition).
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