Radyne DMD2050, Operation Manual

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User Interfaces DMD2050 Universal Satellite Modem
4-38 TM110 - Rev. 1.3
IF: IF loopback loops the IF output of the Modulator to
the IF input of the Demodulator. If using 8PSK or
16QAM Modulation, the output power must be above
-15 dB.
TERR TX/RX: Enables both. Baseband loopback is
performed at interface between the Baseband Processor
Card and the Modem Card. This ensures
Framer/Deframer integrity.
BASEBAND TX/RX: Enables both Baseband Tx and
Baseband Rx.
NONE: No loopback performed.
TERR RX: (Distant Loop) Sends received satellite data
to the Modulator for transmission to the distant end.
BASEBAND RX: Sends Rx data from the Modem Card
to the Tx data input to the Modem Card.
TERR TX: Sends Tx Terrestrial Data to Rx data out.
BASEBAND TX: Sends Tx data to the receive input to
the BB Card.
Only available when using SCC framing.
CARRIER TYPE
{NORMAL, CW, DUAL, OFFSET, POS FIR, NEG FIR}
Allows the user to set the type of carrier.
NORMAL: Causes the Modulator to output normal
modulation.
CW: Causes the Modulator to output a pure carrier.
DUAL: Causes a double sideband output.
OFFSET: Causes a single sideband output.
POS FIR: For manufacturer’s use only.
NEG FIR: For manufacturer’s use only.
4.4 DMD2050 Strap Codes
The Strap Code is a quick set key that sets many of the modem parameters. For quick setup of
the DMD2050, Strap Codes are very helpful. When a Strap Code is entered, the modem is
automatically configured for the code’s corresponding data rate, overhead, code rate, framing,
scrambler type and modulation. An example of how to set a strap code follows:
Example: At the Front Panel <Modulator> Menu, depress ‘
↓
’, then move ‘
→
’ to the ‘Strap Code’
Submenu and enter #16. The DMD2050 will be automatically configured to the parameters
shown below in the highlighted row ‘Strap Code 16’.
Use the Strap Code Guide (Table 4-4) for available strap codes.