Scrambling Types; Modulator Frequency Reference; Table A-6. Scrambling Types - Comtech EF Data SNM-1001L Installation And Operation Manual

SNM-1001L Satellite Modem
Specifications
A.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
FDC Closed
A.5.4

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

Table A-6. Scrambling Types

FEC or Framing
Sequential
Viterbi
Viterbi/RS Concatenated
Turbo
Sequential
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.
A–7
Scrambling
ITU V.35
ITU V.35 Intelsat Modified
EFD Modified V.35
12-1
2 Synchronous
FDC Modified V.35
Revision 1
MN/SNM1001L.IOM