User guide

Building Your Canopy Network March 2005
Through Software Release 6.1
Issue 1 Page 191 of 425
Canopy System User Guide
Broadcast Repeat Count
In Release 4.2 and later releases, this parameter controls how many times, in addition to
the original broadcast, the AP repeats each broadcast. Examples of conditions where
each setting can be best are provided in the following table.
Value
(retries)
Condition
0
1
1
1
Where packet throughput is more important than reliability (such as in downstreaming
video.
2
2
Where the AP does not broadcast a significant amount of traffic.
3
Where a high rate of connectionless, unacknowledged packets (such as UDP) are
transmitted (for example, where most broadcast traffic is in ARP).
NOTES:
1. If you configure the AP either to not rebroadcast or to rebroadcast only once, monitor
transmissions to confirm that acceptable quality is achieved.
2. The previous and current default treatment is two retries.
Downlink Data
Specify the percentage of the aggregate throughput for the downlink (frames transmitted
from the AP to the subscriber). For example, if the aggregate (uplink and downlink total)
throughput on the AP is 6 Mb, then 75% specified for this parameter allocates 4.5 Mb for
the downlink and 1.5 Mb for the uplink. The default for this parameter is 75%.
CAUTION!
You must set this parameter exactly the same for all APs in a cluster.
High Priority Uplink Percentage
Specify the percentage of the uplink bandwidth to dedicate to low-latency traffic. When
set, this percentage of RF link bandwidth is permanently allocated to low-latency traffic,
regardless of the amount of low-latency traffic that is present. No corresponding downlink
parameter is settable. Scheduling algorithms in the AP allocate the corresponding
downlink percentage.
IMPORTANT!
Carefully consider parameter settings for the high-priority channel. The
bandwidth that you allocate to this channel decreases bandwidth on the
regular channel, regardless of whether high-priority traffic exists. See
High-priority Bandwidth on
Page 64.