Comtech EF Data LCS-4 - Manual (Page 28)

LCS-4 L-Band Combiner Switch Revision 1
Connector and Pinouts MN/LCS4.IOM
3–4
3.5 (F
UTURE
O
PTION
) M
ODULATOR
F
AULTS AND
TX O
N
/O
FF
C
ONNECTOR
Use of this connector is optional. It permits control of two 1:1 modulators by sensing the fault
status from the 1:1 modem pair.
Pin # Signal Name Signal
Direction
Description
1
2 MOD1_FLT
MOD2_FLT I
I Modulator 1 TTL Fault Input
Modulator 2 TTL Fault Input
3
4 MOD3_FLT
MOD4_FLT I
I Modulator 3 TTL Fault Input
Modulator 4 TTL Fault Input
5 GND GND Ground
6 MOD1_TX_CNTRL O Turns Modulator 1 TX Carrier OFF TTL_OC Output
7 MOD2_TX_CNTRL O Turns Modulator 2 TX Carrier OFF TTL_OC Output
8 MOD3_TX_CNTRL O Turns Modulator 3 TX Carrier OFF TTL_OC Output
9 MOD4_TX_CNTRL O Turns Modulator 4 TX Carrier OFF TTL_OC Output
Notes:
1. Inputs not exceed +5 VDC or less than 0 VDC.
2. Outputs are TTL Open Collector and require an external pull-up resistor.
3. Fault is indicated by TTL high level. OK (NO LEVEL) is indicated by TTL Low Level.