Comtech EF Data SDM-2020 - Manual (Page 123)

SDM-2020 Satellite Modulator Revision 7
ECL/HSSI TX MN/SDM2020M.IOM
10-2
10.1.3 ECL/HSSI D
ATA
I
NTERFACE
S
PECIFICATION
S
UMMARY
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)
No Framing
10.1.4 T
ERRESTRIAL
(U
SER
) D
ATA
I
NTERFACE
10.1.4.1 T
ERRESTRIAL
T
RANSPORT
P
ROTOCOLS
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 10-1).
Table 10-1 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 10-1. 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.