Comtech EF Data SDM-2020, Installation And Operation Manual

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SDM-2020 Satellite Demodulator Data Interfaces
Rev.3 A–73
Signal Function/Name Pin # Type Comment
Data 3 B 20 I / O Mod / Demod
Data 2 B 21 I / O Mod / Demod
Data 1 B 22 I / O Mod / Demod
Data 0 B 23 I / O Mod / Demod
DVALID B 24 I / O Mod / Demod
SYNC B 25 I / O Mod / Demod
A.8.6.3 Auxiliary Connector Pinout (J5)
The ausiliary connector is either a 9-Pin D female connector or a modular telephone jack
connector with 6 pins.
•
Single ended signals, such as the faults MF and DF, are open collector where:
Voh=12V max. and Vol=0.5V max. @ Iol=8 ma.
A pull-up resistor external to the equipment is required. A fault is indicated in the
modulator or demodulator when the open collector is OFF. An ON collector indicates an
OK status.
•
Ext Clk is an LVDS input.
•
Carrier Detect is a TTL output. TX IF ON / OFF is a single ended TTL input.
•
Table A-42 is the pin-out for a 9-Pin D female connector.
Table A-42. Auxiliary Connector Pinout (J5)
Signal Function Name Pin # Type Comment
1 GND Signal Ground
Demod Fault Indicator DF 2 O Demodulator Summary Fault
Redundancy switch application
SCT-A SCT-A 3 O LVDS Clock (A) From Modulator
TX IF ON / OFF TXOn-
Off 4 I TTL
EXT Clk-B MC-B 5 I Demodulator, LVDS
Mod Fault Indicator MF 6 O Modulator Summary Fault
Redundancy switch application
Carrier Detect CD 7 O Demodulator
SCT-B SCT-B 8 O LVDS Clock (B) From Modulator
EXT Clk-A MC-A 9 I Demodulator, LVDS
Note:
Ext clock is designed but not M&C enabled.