Scrambling Types; Modulator Frequency Reference - Comtech EF Data SDM-300L3 Installation And Operation Manual

SDM-300L3 Satellite Modem
Specifications
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.
Modulation Type
EFD Closed,
CSC Closed
EFD Closed,
CSC Closed,
FDC Closed
EFD Closed
EFD Closed
EFD Closed
EFD Closed
FDC Closed
Intelsat Open
Intelsat Open
Intelsat Open
14.5.4

Modulator Frequency Reference

SCT, RX Bit Clock, and IF output are locked to the Frequency Reference.
Internal (Standard)
External Reference
Input (Standard)
Calibration
Table 14-6. Scrambling Types
FEC or Framing
Sequential
Viterbi
Viterbi/RS Concatenated
Turbo
Turbo
ASYNC
Sequential
Viterbi IDR
Viterbi IDR with RS
IBS, D&I, IESS-310
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)
≥ +0 dBm < +20 dBm
Amplitude
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.
14–9
Scrambling
ITU V.35
ITU V.35 Intelsat Modified
EFD Modified V.35
12-1
2 Synchronous
IESS-315
15-1
2 Synchronous
FDC Modified V.35
ITU V.35 Intelsat Modified
ITU V.35 Intelsat Modified
15-1
2 Synchronous
Revision 0
MN/SDM300L3.IOM