Ubiquiti Networks PowerBridgM - Manual (Page 24)

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Chapter 4: Wireless Tab airOS ™ v5.5.4 User Guide
Ubiquiti Networks, Inc.
Channel Shifting Enables special channels with a
frequency offset regarding standard 802.11b/g/n and
802.11a channels. This is a proprietary feature developed
by Ubiquiti Networks. While 802.11 networks have
standard channels (for example, Channel 36 (5180 MHz),
Channel 40 (5200 MHz), and so forth, spaced every 5 MHz
apart), channel shifting uses non-standard (non-802.11)
channels offset from the standard channels. All the
channels can be shifted by 5 MHz (in 802.11a/n) or
2 MHz (in 802.11b/g/n) from the default central channel
frequency.
Note: Channel Shifting is not compatible with
legacy products.
The benefits of Channel Shifting include private
networking and inherent security, so your network is less
likely to be detected by other Wi-Fi devices.
Frequency, MHz The default, Auto, allows the device
to automatically select the frequency. You can specify a
frequency from the drop-down list.
If DFS frequencies in the UNII‑2 band (5.25 ‑ 5.725 GHz)
should be available for your device but are not displayed
in the drop-down list, then the DFS frequencies are locked.
For information on how to unlock the DFS frequencies,
refer to this option, “UNII‑2 Band” on page 58.
Extension Channel (Available in Access Point or
AP‑Repeater mode only with 40 MHz channel width
enabled.) A 40 MHz channel is two 20 MHz channels
bonded together. The Extension Channel tells the radio
to append an additional channel either above or below
the existing standard channel. For example, if you select
5805 MHz (40 MHz channel) and Below, the radio will use
(5775 to 5795 MHz) + (5795 to 5815 MHz), but if you select
5805 MHz (40 MHz channel) and Above, the radio will use
(5795 to 5815 MHz) + (5815 to 5835 MHz).
Frequency List, MHz (Available in Access Point or
AP‑Repeater mode only.) Multiple frequencies are available
to avoid interference between nearby APs. The frequency
list varies depending on the selected Country Code, IEEE
802.11 Mode, Channel Width, and Channel Shifting options.
Once enabled, click Edit to open the Frequency List
window.
Select the frequencies and click OK, or click Close to close
the window without any selections.
Frequency Scan List, MHz (Available in Station mode
only.) This restricts scanning to only the selected
frequencies. The benefits are faster scanning as well as
filtering out unwanted APs in the results. The Site Survey
tool will look for APs in selected frequencies only. Once
enabled, click Edit to open the Frequency List window.
Select the frequencies that you want to scan and click OK,
or click Close to close the window without any selections.
Auto Adjust to EIRP Limit (Not applicable to the
NanoStationM900 loco.) This option should remain
enabled so it forces the transmit output power to comply
with the regulations of the selected country. If enabled,
you cannot set EIRP above the amount allowed per
regulatory domain (different maximum output power
levels and antenna gains are allowed for each IEEE
802.11b/g/n regulatory domain or country).
To disable Auto Adjust to EIRP Limit, you must enable the
Installer EIRP Control setting on the Advanced tab.
Antenna (Only applicable to the NanoStationM900 loco,
NanoBridge, and airGrid models.) Follow the instructions
for your device:
•
NanoStationM900 loco Select the appropriate option:
Internal (2x2), External (1x1), or External + Internal (2x2).
The external RP-SMA maps to chain 0, which is the
horizontal polarity internally.
• NanoBridgeM2 Select the size of the dish reflector, 400
‑ 18 dBi. If you are not using a dish reflector, then select
Feed only ‑ 3 dBi. The default is Not specified, which
means no gain.
• NanoBridgeM5 Select the size of the dish reflector,
300 ‑ 22 dBi or 400 ‑ 25 dBi. If you are not using a dish
reflector, then select Feed only ‑ 3 dBi. The default is
Not specified, which means no gain.
• airGridM2/M2 HP Select the size of the grid reflector,
11x14 – 16 dBi or 17x24 – 20 dBi. If you are not using a
grid reflector, then select Feed only ‑ 3 dBi. The default
is Not specified, which means no gain.
• airGridM5/M5 HP Select the size of the grid reflector,
11x14 – 23 dBi or 17x24 – 28 dBi. If you are not using a
grid reflector, then select Feed only ‑ 3 dBi. The default
is Not specified, which means no gain.