Motorola AP-7131 Product Reference Manual page 195

ERP Protection
HT Protection
3. Configure the Channel, Power and Rate Settings
diversity setting, radio transmit power level and data rate.
Channel Width
Extended Rate PHY (ERP) allows 802.11g MUs to interoperate with
802.11b only MUs. ERP Protection is managed automatically by the
access point and informs users when 802.11b MUs are present
within the access point's coverage area. The presence of 802.11b
MUs within the 802.11g coverage area negatively impacts network
performance, so this feature should looked to as an indicator of
why network performance has been degraded.
Displays the HT Protection state, and whether a non HT protected
MU is currently associated with the AP-7131.
Select the Channel Width (MHz)
AP radio can support 20 and 40 MHz channel widths. 20 MHz is the
default setting for the 2.4 GHz radio. 20/40 MHz operation (the
default setting for the 5 GHz radio) allows the AP-7131 to receive
packets from clients using 20 MHz of bandwidth while transmitting
a packet using 40 MHz bandwidth. This mode is supported for 11n
users on both the 2.4 and 5 GHz radios. If an 11n user selects two
channels (a Primary and Secondary channel), the system is
configured for dynamic 20/40 operation.
When 20/40 is selected, clients can take advantage of "wider
channels." 802.11n clients experience improved throughput using
40 MHz while legacy clients (either 802.11a or 802.11b/g
depending on the radio selected) can still be serviced without
interruption using 20 MHz. Define a value as needed depending on
the channel used. This field is not available when B and G is
selected as the 802.11 b/g/n mode.
Network Management
field to assign a channel, antenna
from the drop-down menu. The
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