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Data Interfaces
A.5.3
Specifications
A.5.3.1
Specification Summary
Refer to Table A-13.
Terrestrial (User) Data Interface:
Framing Format Compatibility
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.
Transport Protocol
TM1449 (DVB)
DBS
No Framing
A–28
Table A-13. Specification Summary
Type
Data Rate
Signals Supported
Electrical
Connector
Table A-14. Framing Format Summary
Framing Format Summary
Transport Package
Sync
Size (bytes)
Byte
188, 204
yes
204
yes
187
no
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)
TM1449 (DVB)
DBS (1.5 to 32 Mbit/s only)
Transport frame is 188 or 204 MPEG-2
transport stream or none (No Framing).
Sync Byte
Data Valid
Strobe
Strobe
yes
yes
yes
no
no
no
SDM-2020 Satellite Demodulator
Comments
SYNC active for byte time.
SYNC active for bit time.
Extend one bit time for error.
data stream.
Rev.3
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