AS 680/682
Description, Operation and Maintenance Supervisor Operation
ADS−B
5−15Ed. 10.07
5.4.4 Page ’Telegram Filter’
The Ground Station AS 680 is able to filter Mode S downlink telegrams according to their format in
order to reduce SPC CPU load. This feature can be useful to eliminate undesired signals e.g. replies
to TCAS interrogations, short squitters or replies to radar interrogations.
The filter settings are defined on the ’Telegram Filter’ page (see Fig. 5−8) by selecting or deselecting
the desired Mode S formats. Deselected formats are not processed by the Ground Station. The follo-
wing figure shows the page with a sample downlink mask. Each selected format is indicated by a
green button (‘On’) while deselected formats are shown by a red button (‘Off’).
Fig. 5−8 Page ’Telegram Filter’ (example)
The ’Refresh’ button requests the current downlink mask settings from the Ground Station and up-
dates the page accordingly.
All settings can be changed in supervisor mode by clicking on the red or green indicators to the left
of each format description. Before changes take effect, they have to be applied to the Ground Station
using the corresponding ’Set Values’ button.
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