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User Interfaces DMD15/DMD15L IBS/IDR Satellite Modem
4-26 TM051 – Rev. 5.8
Loopbacks: Terrestrial Loopback is performed at the Terrestrial
Interface
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.
Tx Terr: Sends Tx Terrestrial Data to Rx data out.
Rx Terr: (Distant Loop) Sends received satellite data to the
Modulator for transmission to the distant end.
Tx/Rx Terr: Enables both. Baseband loopback is performed at
interface between the Baseband Processor Card and the
Modem Card. This ensures Framer/Deframer integrity.
Tx BB: Sends Tx data to the receive input to the BB Card.
Rx BB: Sends Rx data from the Modem Card to the Tx data
input to the Modem Card.
Tx/RX BB: Enables both.
Carrier:
CW: Causes the Modulator to output a pure carrier.
Dual: Causes a double sideband output.
Offset: Causes a single sideband output.
Normal: Causes the Modulator to output normal modulation.
Pos Fir: For manufacturer’s use only.
Neg Fir: For manufacturer’s use only.
4.4 DMD15/DMD15L Strap Codes
The Strap Code is a quick set key that sets many of the modem parameters. For quick setup of
the DMD15/DMD15L, 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 DMD15/DMD15L will be automatically configured to the parameters
shown below in the highlighted row ‘Strap Code 16’.