Configuration
QB.11-R Installation and Management
Interface Parameters
78
antenna without violating the maximum radiated output power allowed for your country. Also, some countries/bands
that require DFS also require the transmit power to be set to a 6 dB lower value than the maximum allowed EIRP
when link quality permits. You can see your unit’s current output power for the selected frequency in the event log.
The event log shows the selected power for all data rates, so you must look up the proper data rate to determine the
actual power level.
NOTE:
This feature only lets you decrease your output power; it does not let you increase your output power beyond
the maximum allowed defaults for your frequency and country.
Select one of the following options and click
OK
at the bottom of the window. Your original output power is adjusted
relative to the value selected. The new setting takes effect immediately without rebooting:
NOTE:
For 4954-R models: to comply with FCC Part 90 regulations when using an external antenna, a TPC value of
-3 dB is required regardless of antenna size, and a larger TPC value may be required to limit the total EIRP to
29dBm or less. For 4954-R models that have an integrated flat-panel antenna, a TPC of -9 dB must be used to
comply with FCC Part 90 regulations.
To insure proper operation, the maximum TPC attenuation is -9 db.
The -10 dB and -18 dB selections are not usable.
NOTE:
24 Mbps and lower modulation have m16 dBm TX power, 36 Mbps has m13 dBm TX
power, 48 Mbps has m12 dBm TX power, and 54 Mbps has m11 dBm TX power. Because
higher modulation has a lower maximum TX power, the total TPC range is smaller at a higher data rate.
Because the minimum TX power is equal for all data rates, each TPC selection has constant TX power for all
data rates except where the maximum TX power is limited.
•
Actual Transmit Power Control:
The configured Transmit Power Control setting.
•
Enable Turbo Mode
(US Non-DFS Only; 5054-R Only)
:
Check this box to enable Turbo Mode.
Turbo Mode is
supported only on the 5054-R when DFS is not required, and only in the United States.
Enabling turbo mode, in
its current implementation, allows the unit to use two adjacent frequency channels to transmit and receive a signal. By
enabling turbo mode, the receive sensitivity improves by 4 dB for the 36 Mbps data rate and by 2 dB for the 24 Mbps
data rate.
NOTE:
The additional sensitivity is provided with the impact of using twice as much spectrum and thus increasing the
opportunity of interference and decreased ability for system collocation. Generally, Turbo mode is not
recommended except when the extra sensitivity is absolutely required.
•
Frequency Channel:
The frequency channel indicates the band center frequency the unit uses for communicating
with peers. This frequency channel can be set in several ranges, depending upon regulatory domain. Refer to
for channelization information. For countries in which DFS is not required, the
Frequency
Channel
list displays only the channels and frequencies allowed for the selected country.
For countries/bands in which DFS is required,
Frequency Channel
is not configurable. Instead the channel is auto-
selected by the DFS process.
On 5054-R/-LR World units, if
All Channels 5 GHz
is selected in the
Country
drop-down menu on the
Configure >
System
page, any channel in the 5 GHz range is manually selectable.
•
Scanning Across Bandwidth:
Enable this field if you want the SU to scan across the whole range of channel
bandwidths (5, 10, or 20 MHz, as available) with or without roaming enabled. Disable this field if you wish the SU to
scan only across its configured channel bandwidth.
TPC Selection (dB)
Maximum TX Power (dBm)
0 (default)
16
-3
13
-6
10
-9
7
-12
4
-15
1
-18 (minimum TPC level)
0
