21Chapter 4: Main TabairFiber® AF5/AF5U User GuideUbiquiti Networks, Inc.When the airFiber AF-5 operates in a DFS country, itperforms a Channel Availability Check (CAC) beforeoperating. The rules vary by country and frequency, but ingeneral:• FCC domains If the airFiber AF-5 operates in the DFSband (5.4 GHz band), then the following rule applies:• If the TX and RX Frequencies are the same, then theairFiber AF-5 performs a 60-second check on theMaster only.• If the TX and RX Frequencies are different, then theairFiber AF-5 performs a 60-second check on both theMaster and Slave.• ETSI domains For most frequencies, the airFiber AF-5performs a 60-second check on the Master and Slave;however, if it operates in the 5600-5650 MHz range, thenthe airFiber AF-5 performs a 10-minute check.While the airFiber AF-5 is performing this check, the RFLink Status displays DFS CAC, and the RF Link Timeout isdisplayed.If radar is detected, the RF Link Status displays RADARDetected, and the RF Link Timeout is displayed.RF Link Timeout (Available only if the RF Link Status isDFS CAC or RADAR Detected.) During the DFS CAC or RADARDetected state, the RF Link Timeout counts down the timeremaining before the airFiber AF-5 can move to the nextRF link state.Link Name Displays the name of your link.Security AES-128 is enabled at all times.Version Displays the airFiber Configuration Interfacesoftware version.Uptime This is the total time the device has been runningsince the latest reboot (when the device was powered up)or software upgrade. The time is displayed in days, hours,minutes, and seconds.Link Uptime This is the total time the airFiber link hasbeen continuously operational. The time is displayed indays, hours, minutes, and seconds.Remote MAC Displays the Management Ethernet MACaddress of the remote airFiber AF-5.Remote IP Displays the Management Ethernet IP addressof the remote airFiber AF-5.Date Displays the current system date and time. Thedate and time are displayed in YEAR-MONTH-DAYHOURS:MINUTES:SECONDS format. The system date andtime is retrieved from the Internet using NTP (NetworkTime Protocol). The NTP Client is enabled by default onthe Services tab. The airFiber AF-5 doesn’t have an internalclock, and the date and time may be inaccurate if theNTP Client is disabled or the device isn’t connected to theInternet.Duplex Displays Full Duplex or Half Duplex. Full-duplexmode allows communication in both directionssimultaneously. Half-duplex mode allows communicationin one direction at a time, alternating betweentransmission and reception.TX Frequency Displays the current transmit frequency.The airFiber AF-5 uses the radio frequency specified totransmit data.RX Frequency Displays the current receive frequency.The airFiber AF-5 uses the radio frequency specified toreceive data.Channel Width Size of the channel in MHz.Regulatory Domain Displays the regulatory domain(FCC/IC, ETSI, or Other), as determined by countryselection.MGMT MAC Displays the MAC address of theManagement port.MGMT Displays the speed and duplex of the Managementport.DATA Displays the speed and duplex of the Data port.Chain 0/1 Signal Strength Displays the absolute powerlevel (in dBm) of the received signal for each chain.The software calculates the proper signal strength basedon the measured distance and power levels, and then itscales the Signal Strength bar graphs so that when the linkis aimed correctly, the bar graphs are full-scale. If the bargraphs are not full-scale, then they indicate that your linkis not optimally aimed.Remote Chain 0/1 Signal Strength Displays the absolutepower level (in dBm) of the received signal for each chainof the remote airFiber AF-5. The bar graphs will display asfull-scale once the link is aimed correctly.Local Modulation Rate Displays the modulation rate:• 10x (1024QAM MIMO)• 8x (256QAM MIMO)• 6x (64QAM MIMO)• 4x (16QAM MIMO)• 2x (QPSK MIMO)• 1x (½ Rate QPSK xRT)• ¼x (¼ Rate QPSK xRT)If Automatic Rate Adaptation is enabled on the Wirelesstab, then Local Modulation Rate displays the current speedin use and depends on the Maximum Modulation Ratespecified on the Wireless tab and current link conditions.