Comtech EF Data SDM-2020 - Manual (Page 160)

SDM-2020 Satellite Modulator Revision 7
ASI/LVDS Data Interfaces MN/SDM2020M.IOM
13-4
Table 13-1. ASI/LVDS Specifications (Continued)
Auxiliary Specifications
Fault Signal MF (modulator fault) and DF (demodulator fault). OC-TTL fault outputs.
TX ON / OFF TTL input, when enabled this signal turns the TX carrier ON / OFF.
Ext Clock Pin(s) reserved, but not defined
Monitor & Control
Interface Select ASI or LVDS
Auxiliary Functions Transmitter Control: TX IF Control ON / OFF
Polarity select Normal or Inverted
Controlled
Functions Interface Select: ASI or LVDS
Interface Loopback
Interface Loop Thru
Data Rate
TX ASI Data Input J3 / J4 Select
Loss of data. Programmable as Fault or Alarm
Clock, Normal or Inverted
Data, Normal or Inverted
Monitored
Functions Loss of TX Data (Data Connector Removed): The modulator indicates a loss of sync
(framed modes) and transmits all 1s in the data portion of the frame.
The demodulator detects the presence of all ones and reports it to the display and
remote port.
TX clock PLL program error
Data violations (TX)
FIFO Faults
ASI Data Loop BW
Selection Wide and Narrow
Additional M&C
Monitored
Functions Loss of TX Data or Clock (Data Connector Removed): The modulator indicates a
loss of sync (frame and mode) and transmits all 1s in the data portion of the frame.
The demodulator detects the presence of all ones and reports it to the display and
remote port.