Download Comtech EF Data SDM-650B Specifications

SDM-300L3 Satellite Modem
Specifications
15.5.3
Revision 0
MN/SDM300L3.IOM
Scrambling Types
When scrambling is enabled, it is applied to the modulator data according to the
programmed modulator type as listed in the following table. When scrambling is disabled,
no scrambling is applied to the modulator data.
Table 15-6. Scrambling Types
Modulation Type
EFD Closed,
CSC Closed
EFD Closed,
CSC Closed,
FDC Closed
EFD Closed
EFD Closed
EFD Closed
FDC Closed
Intelsat Open
Intelsat Open
Intelsat Open
15.5.4
FEC or Framing
Sequential
Scrambling
ITU V.35
Viterbi
ITU V.35 Intelsat Modified
Viterbi/RS Concatenated
Turbo
ASYNC
Sequential
Viterbi IDR
Viterbi IDR with RS
IBS, D&I, IESS-310
EFD Modified V.35
12-1
2
Synchronous
15-1
2
Synchronous
FDC Modified V.35
ITU V.35 Intelsat Modified
ITU V.35 Intelsat Modified
15-1
2
Synchronous
Modulator Frequency Reference
SCT, RX Bit Clock, and IF output are locked to the Frequency Reference.
Internal (Standard)
External Reference
Input (Standard)
Reference Frequency
Output
Calibration
Stability over the operating temperature range = ± 0.02 PPM.
The External frequency reference connector is located on the back panel. This
allows the Frequency Reference to be locked to an external reference frequency
standard.
Impedance
75Ω
Frequency
1, 5, 10 or 20 MHz (10 MHz required if supplying 10 MHz
reference to BUC or LNB)
Amplitude ≥ +0 dBm < +20 dBm
DC offset Capacitively coupled
Connector
BNC female (50Ω)
The External frequency reference connector can be used as an output. When
selected from the front panel, this output can be used to lock other equipment to the
Internal High Stability Reference of the selected modem.
The output is 10 MHz, the level is +5 ± 5 dBm.
Front panel programmable adjustment for aging.
15–9