MSM7xx Controllers Configuration Guide v6.4.0

devices in the network, the collision rate will grow exponentially and prevent any useful throughput
from the wireless network.
802.11n clients face the same problem as described above – legacy 802.11b clients cannot
detect the High Throughput (HT) rates that 802.11n uses. So to avoid causing excessive collisions,
802.11n clients must use the same protection mechanisms when a legacy client is present. Even
the most efficient protection mechanism (CTS-to-self) causes a substantial decline in throughput;
performance can decline by as much as 50 percent. For this reason, the protection behavior of
the HP 425, MSM430, MSM460, MSM466, and MSM466-R can be configured (see “Tx
protection” (page 98)) to allow network administrators greater flexibility over their deployments.
NOTE: 802.11n clients can only achieve maximum throughput when legacy clients are not
present on the same radio. You can use the Allow 802.11n clients only setting to segregate 802.11n
traffic to ensure that 802.11n clients do not experience performance degradation by sharing a
wireless network with legacy (slower) client stations.
Radio configuration
To define configuration settings for a radio, select Controller > Controlled APs >> Radio Management
> Radio configuration. This opens the Product radios page which lists all radios on all AP models.
For example:
To configure the radios for a product, select the product in the list. This opens the Radio(s)
configuration page. The contents of this page varies depending on the product. The following
example shows the Radio(s) configuration page for the MSM466 and MSM466-R.
Radio configuration 85