AS 680/682
Description, Operation and Maintenance Subsystem Description
ADS−B
2−9Ed. 10.07
2.1.4.3.1 Definition of front Connectors J3 to J6
− J3, Transmitter Interface (TX control); normally not used; connector SubD, 9pin, female
This interface is used for downlink as well as for uplink telegrams. The SPB provides digital video
signals. All signals have TTL level characteristics (with 50 ohm termination) and are equipped by
ac−filter to ensure high signal shape quality. For transmitting Mode−S messages on air, additional
equipment is required: a downlink modulator and transmitter unit at 1090 MHz or an uplink modula-
tor and transmitter unit at 1030 MHz. The signal "Suppress" indicates that a downlink (or an uplink)
telegram is going to be transmitted. The signal is available 120 µs for downlink and 2.6 µs for uplink
telegrams before the video signal carries the signal shape.
Assignation of J3:
PIN ASSIGNMENT PIN ASSIGNMENT
1 UL Phase 6 Ground
2 UL Pulse 7 Ground
3 DL Pulse 8 Ground
4 DL Pulse Env 9 Ground
5 Suppress
− J4, Input/Output interface (I/O); connector SubD, 15pin, female
This interface provides 8 input lines and 6 transfer lines: The status signals are general purpose
input lines. Their digital status can be read via the SPB_Sense register. The Ground Station (GS)
status lines have TTL signal characteristics. The meaning is:
Status line 0: Readable by software; used to indicate the status of the GS cabinet door
(open/close).
Status line 4: Readable by software; used to input the status of the Site Monitor.
The Status lines 1 to 3 and 5 to 7 are at time not used. They are readable by software.
The transfer lines are passive connections between the front panel and internal connector J2 at
the back panel of the SPB. They are used to forward backplane signals to the front panel or vice
versa. They are protected by a serial 100 ohm resistor. The max. permitted current load is 50 mA.
Assignation of J4:
PIN ASSIGNMENT PIN ASSIGNMENT
1 Transfer 0 9 Status 3
2 Transfer 1 10 Status 4 − Input Status Site Monitor
3 Transfer 2 11 Ground − Input Status Site Monitor
4 Transfer 3 12 Status 5
5 Transfer 4 13 Status 6
6 Status 0 − Door Status (opt.) 14 Status 7
7 Status 1 15 Ground
8 Status 2
− J5, Trigger in; normally not used; jack, 4 mm
External trigger signal for telegram transmission purposes.
− J6, BITE I/O (status exchange); optionally use; connector RJ45, 8pin, female
The Status exchange can be used to interchange the BITE status between two Ground Stations
(GS A with GS B) at a dual site if the corresponding BITE test is enabled.
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