Data Interfaces
SDM-2020 Satellite Demodulator
A–28
Rev.3
A.5.3 Specifications
A.5.3.1 Specification
Summary
Refer to Table A-13.
Table A-13. Specification Summary
Terrestrial (User) Data Interface:
Type
Data Rate
Signals Supported
Electrical
Connector
Synchronous serial
1.5 to 70 Mbit/s
RT, RD, ST, TT, SD, TA, CA, LA, LB,
LC, TM, TPSYNC, TDVALID, CD, DF,
MF, RPSYNC, RDVALID
Per EIA-612 (10KH ECL)
50-pin mini-D female per EIA-613 (HSSI)
Framing Format Compatibility
TM1449 (DVB)
DBS (1.5 to 32 Mbit/s only)
Transport frame is 188 or 204 MPEG-2
transport stream or none (No Framing).
A.5.4
Terrestrial (User) Data Interface
A.5.4.1
Terrestrial Transport Protocols
The demodulator/modulator is compatible with TM1449 transfer of MPEG-2 data signals
in the standardized transport layer format. The demodulator/modulator also supports DBS
(DBS-PS-007) no framing (187 bytes) format modes (Table A-14).
Table A-15 summarizes the primary characteristics of each transport protocol. The
SDM-2020 was designed to comply with these primary interface standards, however;
custom interfaces can be supported as outlined in the data transfer modes definition
section of this document.
Table A-14. Framing Format Summary
Framing Format Summary
Transport Protocol
Transport Package
Size (bytes)
Sync
Byte
Sync Byte
Strobe
Data Valid
Strobe
Comments
TM1449 (DVB)
188, 204
yes
yes
yes
SYNC active for byte time.
DBS
204
yes
yes
no
SYNC active for bit time.
Extend one bit time for error.
No Framing
187
no
no
no
data stream.
Summary of Contents for SDM-2020
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