Comtech EF Data SDM-2020 - Manual (Page 165)

SDM-2020 Satellite Demodulator Revision 4
ECL/HSSI Data Interface MN/SDM2020D.IOM
10–13
10.1.5.2 Faults
Refer to Table 10-10 for ECL/HSSI fault indicators to the HSSI connector (Reserved
DCE pins) from the modem interface.
Table 10-10. Fault Signal Definitions
Signal Definition
Carrier Detect (CD) Indicates Demodulator carrier tracking loop locked. Status output. TTL output.
Active High (programmable).
Modulator Fault (DF) Open collector TTL signal indicating Demodulator fault. Active High. An
external pull-up resistor is required.
Modulator Fault
(MF) Open collector TTL signal indicating Modulator fault. Active High. An external
pull-up resistor is required.
10.1.5.3 ECL/HSSI Interface Front Panel Menus
Refer to Functional Select: Utility: Interface menu.
10.1.5.4 ECL/HSSI Interface Remote Control Commands
Refer to the applicable appendix for a listing of ECL/HSSI interface module remote
control commands.