This article describes what to do when your airFiber's signal strength indicators show excellent signal, but your device is not functioning as if it that were so.
Table of Contents
Symptoms & Solutions
If the device shows good signal strength in all your Signal Strength indicators, but the airFiber5 link isn't able to modulate at maximum data rate for these signal levels (please check the Receive Sensitivity table for more information).
Please make sure your link meets the following parameters:
- Clear Line of Sight (LOS) between two sites.
- No objects that could be causing reflection issues. If the antennas are installed in a roof with metal or any reflective surfaces, install the AF5 as high up as possible, at least 3meters (10ft) above any reflective surface (please read this Community post: Best location for a high performance link).
- There's no high interference in the frequencies you are using, you can use airView to determine the best channel (available in firmware 2.1 or higher).
- There's no signal mismatch among 4 signal strength indicators. Maximum deviation should be less than 4dB.
NOTE: Since firmware version 4.0, airFibers show an IDEAL POWER. This value is calculated by distance, gain, and output power. Your signal should match the IDEAL POWER value within 1-2dB. If it does not, you have a line of sight issue, or your alignment is off.
AF5 and AF5U Receive Sensitivity Table
airFiber AF5/AF5U Receive Sensitivity
|Spatial Streams||Modulation||Sensitivity (10 MHz)||Sensitivity (20 MHz)||Sensitivity (40 MHz)||Sensitivity (50 MHz)||FDD Capacity*||TDD Capacity*|
|8x||256QAM||-70 dBm||-67 dBm||-65 dBm||-64 dBm||1024 Mbps||512 Mbps|
|6x||64QAM||-77 dBm||-74 dBm||-72 dBm||-71 dBm||768 Mbps||384 Mbps|
|4x||16QAM MIMO||-84 dBm||-81 dBm||-79 dBm||-78 dBm||512 Mbps||256 Mbps|
|2x||QPSK MIMO||-90 dBm||-87 dBm||-85 dBm||-84 dBm||256 Mbps||128 Mbps|
|1x||1/2 Rate QPSK xRT||-93 dBm||-90 dBm||-88 dBm||-87 dBm||128 Mbps||64 Mbps|
|1/4x||1/4 QPSK xRT||-95 dBm||-93 dBm||-92 dBm||-91 dBm||32 Mbps||16 Mbps|