Comtech EF Data SDM-650B Installation And Operation Manual page 303

SDM-650B Satellite Modem
G.4 Configuration Guide
BBLoopBk (Baseband Loopback)
EXT_REF (Station Clock Freq)
REF_CLK (Ref Clock Source)
TX_clock
RX_clock
BUF_CNTR (Center Doppler Buffer)
BUF_DPTH (Buffer Depth, bits)
Notes:
G.4.1 Modulator/Coder Defaults
TXA
TXB
TXC
TXD
TXR
TX_Freq
RF_Out
TX_Power
Scramblr
DifEncdr
CW_Mode
Rev. 5
Menu Selection
1. Reference clock source is temporarily set to Receive clock during baseband
loopback.
2. Do not set TX_clock to REF_CLK when REF_CLK source is TX_clock, as
this makes an unstable loop.
3. Send Data (SD) must be long-term synchronous with Send Timing (ST),
unless REF_CLK source is Transmit and TX_clock is External (this is the
recommended dejitter configuration).
4. EXT_REF frequency selection is a "don't care" unless REF_CLK is selected
to External. The M&C processor automatically sets the proper division rate
for the clock synthesizer in the other cases.
Transmit Filter A
Transmit Filter B
Transmit Filter C
Transmit Filter D
Transmit Rate Selected
Transmitter Frequency
RF Output
Transmit Power Level
Scrambler
Differential Encoder
Continuous Wave Mode
Options
OFF/ON
n kHz (must be evenly divisible by 8 kHz)
Transmit
Receive
External (MC)
Internal (SCT)
External (TT)
Internal (Synthesizer)
Normal/Inverted
YES/NO
512 bit
1024 bit
2048 bit
4096 bit
8192 bit
16384 bit
32768 bit
7/8 code rate, 56 kbit/s
3/4 code rate, 56 kbit/s
1/2 code rate, 56 kbit/s
1/2 code rate, 64 kbit/s
"A" 7/8, 56 kbit/s
70 MHz
OFF
-10 dBm
ON
ON
OFF
Trojan Interface
G–7