AS 680/682
Description, Operation and Maintenance Maintenance and Repair
ADS−B
7−9Ed. 10.07
d) Go on site and disable RXU DC output (jumper X3 open) and connect the Site Monitor output
directly to the RXU input.
e) Check own Site Monitor telegram reception to verify RXU is ok.
− If SBC, SPB and RXU are ok, the ADS−B antenna or the LNA or the connecting cable is broken.
7.2.3.2 Tests if no Network Connection
In preparation
7.2.3.2.1 If on Site: Check cables
− Is a straight Ethernet cable connected between main interface and router?
− Is a crossover Ethernet cable connected between auxiliary interface and LCMS?
− The BITE connector on the SPB is for a special non−Ethernet cable to exchange BITE summary
between ground stations on site.
7.2.3.2.2 Check Network Connection
− Login into the Ground Station: either from the other network connection, if available, or better from
the serial interface (if on site).
− If not possible try the next step below from outside, i.e. the following unit on the network (e.g. the
LCMS).
− Enter the command ping <IP−Address of next unit on network> (this could be e.g. the router
or the LCMS) to see if a connection can be established at all on low protocol level.
− Verify both units belong to the same network (e.g. both units’ interfaces have the same front part
of the IP address (first three numbers), like "192.168.23.4".
At the LCMS, enter the command /sbin/ifconfig −a . Look for the Ethernet address in the
first line.
7.2.3.3 Tests if no Raw Data
Any BITE failure? If yes, try looking at more detail in the TSC (see also previous tests).
7.2.3.3.1 Check Output Configuration
− On the TSC ’Network’ page, check that Raw Data ’Output’ is enabled on the affected output port.
− Check that its destination ’IP−Address’/’Port’ is consistent with the intended output interface and
the IP address/port settings of the destination.
7.2.3.3.2 Check Network
See previous tests, refer to section 7.2.3.2.
7.2.3.3.3 Check Reception
− If on site: Is there any valid Mode S input signal at all? RXDL LED on SPB active? Can at least the
Site Monitor be received (provided it is properly connected and active it should always be received,
see previous tests)?
− If on site, check cables: Is an ADS−B antenna cable connected between SPU/RXU and the Ex-
change Panel, between the Exchange Panel and the AAU and between the AAU and the antenna?
− If on site, try recording raw data if another network interface is available. Are there any messages
at all?
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