Comtech EF Data SDM-300L3 - Manual (Page 315)

SDM-300L3 Satellite Modem Revision 0
Specifications MN/SDM300L3.IOM
14–9
14.5.3 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 14-6. Scrambling Types
Modulation Type FEC or Framing Scrambling
EFD Closed,
CSC Closed Sequential ITU V.35
EFD Closed,
CSC Closed,
FDC Closed Viterbi ITU V.35 Intelsat Modified
EFD Closed Viterbi/RS Concatenated EFD Modified V.35
EFD Closed Turbo 2 12-1 Synchronous
EFD Closed Turbo IESS-315
EFD Closed ASYNC 2 15-1 Synchronous
FDC Closed Sequential FDC Modified V.35
Intelsat Open Viterbi IDR ITU V.35 Intelsat Modified
Intelsat Open Viterbi IDR with RS ITU V.35 Intelsat Modified
Intelsat Open IBS, D&I, IESS-310 2 15-1 Synchronous
14.5.4 Modulator Frequency Reference
SCT, RX Bit Clock, and IF output are locked to the Frequency Reference.
Internal (Standard) Stability over the operating temperature range = ± 0.02 PPM.
External Reference
Input (Standard) 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 75
Ω
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 (50 Ω )
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.
Calibration Front panel programmable adjustment for aging.