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Data Interfaces
Data Rate
Clock Rate Uncertainty
Connectors
Electrical Properties
Signal Types
Fault Signal
TX ON / OFF
Ext Clock
Interface Select
Auxiliary Functions
Controlled Functions
Monitored Functions
ASI Data Loop BW
Selection
Monitored Functions
A–68
Table A-38. ASI/LVDS Specifications (Continued)
LVDS Specifications
1.5 to 100 Mbit/s, parallel LVDS
Programmed data rate + 100 ppm
25-Pin D female per EN 80053-9.
Same connector is either TX or RX data (See Loopback / Loop Thru)
per EN 80053-9
D0 – D7, Sync, Dvalid and Clock per EN 80053-9
Data synchronization is detected by correlating the data stream for the
MPEG2 sync pattern per ETS 300 421.
Auxiliary Specifications
MF (modulator fault) and DF (demodulator fault). OC-TTL fault outputs.
TTL input, when enabled this signal turns the TX carrier ON / OFF.
Pin(s) reserved, but not defined
Monitor & Control
ASI or LVDS
Transmitter Control: TX IF Control ON / OFF
Polarity select Normal or Inverted
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
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
Wide and Narrow
Additional M&C
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.
SDM-2020 Satellite Demodulator
Rev.3
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