Comtech EF Data SDM-2020 - Manual (Page 134)

SDM-2020 Satellite Modulator Revision 7
ECL/HSSI TX MN/SDM2020M.IOM
10-13
10.1.6 F
AULTS
Refer to Table 10-9 for ECL/HSSI fault indicators to the HSSI connector (Reserved DCE
pins) from the modem interface.
Table 10-9. 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.
10.1.7 ECL/HSSI I
NTERFACE
F
RONT
P
ANEL
M
ENUS
Refer to Chapter 5, Utility Interface menu.
10.1.8 ECL/HSSI I
NTERFACE
R
EMOTE
C
ONTROL
C
OMMANDS
Refer to Appendix B.