Requirements; Figure A-6. Block Diagram Of Sdm-9000 Configured For Dbs/Dvb Operation; A.2.1 Requirements - Comtech EF Data SDM-9000 Installation And Operation Manual

SDM-9000 Satellite Modem
BASEBAND
DATA
PHYSICAL
INTERFACE
CLOCK
and
DE-JITTER
SYNC FIFO
I
NYQUIST
FROM QPSK
FILTERS
DEMODULATOR
(35% SRC)
Q

Figure A-6. Block Diagram of SDM-9000 Configured for DBS/DVB Operation

A.2.1 Requirements

This section covers the module types that are compatible with each option, and the
minimum software requirements for the modem PCBs. The following options list the
interface type and PCB assembly numbers.
The DBS option works in conjunction with the Viterbi decoder, and includes additional
framing, interleaving, and Codec processing to provide:
•
•
This option can be factory or user installed. Refer to the following table for modem
compatibility requirements.
Interface PCB
Display/M&C PCB
Modulator PCB
Demodulator PCB
DVB Reed-Solomon PCB
Rev. 4
SYNC
DECODER
SYNC 1
(Correlator)
INVERSION
and
2047 AND
SCRAMBLER
AIS
GENERATORS
MAPPING
and
DEPUNCTUR. SYNC
DEPTH 12
DECODER
DEINTERLEAV.
VITERBI (Correlator)
DECODER
(Inner Decoder)
Concatenated FEC
Convolutional encoding/decoding
CONVOLUT.
REED-
SOLOMON DEPTH 12
CODER PUNCTURING
INTERLEAVER
(Outer Coder)
(Inner Coder)
A) TRANSMIT PROCESS
REED-
DESCRAMBLE
SOLOMON and
DECODER
SYNC 1
(Outer Decoder)
INVERSION
B) RECEIVE PROCESS
Type 2 or 3 (or greater)
AS/4477-22 PECL w/buffer
AS/4477-32 PECL w/ESC
AS/4477-21 ECL w/buffer
AS/4477-31 ECL w/ESC
AS/2305 Rev. C4 (or greater)
AS/3969
AS/3970-5 or AS/3970-6
AS/4524
I
K = 7
ENCODER
NYQUIST
TO QPSK
FILTERS
MODULATOR
and
(35% SRC)
MAPPING
Q
BASEBAND
DOPPLER
PHYSICAL
BUFFER
INTERFACE
2047 and
AIS DETECT
Options
DATA
CLOCK
SYNC
A–11