Radyne DMD20 Installation And Operation Manual page 74

User Interfaces
LOOPBACK
CARRIER
4-26
{IF, TERR TX/RX, BASEBAND TX/RX, NONE,
TERR RX, BASEBAND RX, TERR TX, BASEBAND TX,
IFEC TX}
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.
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.
{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.
DMD20 Universal Satellite Modem
TM103 - Rev. 1.1