User's Manual
19
Chapter 5: Wireless TabairFiber X User Guide
Ubiquiti Networks, Inc.
Select one of the available modulation rates:
•  8x (256QAM MIMO)
•  6x (64QAM MIMO)
•  4x (16QAM MIMO)
•  2x (QPSK MIMO)
•  1x (½ Rate QPSK xRT) 
•  ¼x (¼ Rate QPSK xRT)
Frequency Settings
The Valid Frequencies for your Country Code selection are 
displayed. Ensure that you use frequencies that comply 
with the local country regulations.
TDD Split Frequency Mode  This option lets you 
configure separate frequencies for TX and RX. To configure 
split frequencies, enable this option and select a different 
RX frequency on each side of the link. This feature is useful 
if both sides of the link do not have a common, clean 
frequency. It is important for the RX frequency to be 
clean; if different frequencies are clean on each end of the 
link, select the clean RX frequency on each end.
AF-2X Split Frequency Settings
AF-3X Split Frequency Settings
AF-5X Split Frequency Settings
Note for AF-5X only: Split frequency mode is not 
available in DFS bands because the RX frequency 
must match the TX frequency to allow the receiver 
to scan for DFS on the TX frequency. In regions 
where both DFS and non-DFS frequencies are 
available, enabling split frequencies will disable any 
DFS band frequencies. In regions where only DFS 
frequencies are available, there will be no option to 
turn on split frequencies.
Frequency  Enter a valid frequency. The current state is 
displayed.
Note: The Master and Slave should have the same 
Frequency setting. 
Wireless Security
airFiber uses 128-bit, AES (Advanced Encryption Standard) 
encryption at all times.
Key Type  Specifies the character format.
•  HEX  By default, this option uses hexadecimal 
characters. 0-9, A-F, or a-f are valid characters.
•  ASCII  ASCII uses the standard English alphabet and 
numeric characters (0-9, A-Z, or a-z). 
Key  Select the format of the MAC address.
•  HEX  Enter 16bytes (eight, 16-bit HEX values). You can 
omit zeroes and use colons, similar to the IPv6 format. 
The default is: 
0000:0000:0000:0000:0000:0000:0000:0000
Note: The airFiber Configuration Interface 
supports IPv6 formats excluding dotted quad and 
“::” (double-colon) notation.
•  ASCII  Enter a combination of alphanumeric characters. 
Using 128-bit SHA1 (Secure Hash Algorithm 1), the 
airFiberX radio hashes the ASCII key to create a 128-bit 
key for AES.










