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DMD50 Universal Satellite Modem
4.4.8 Test Menu Options and Parameters
TX TEST PATTERN
RX TEST PATTERN
PATTERN SYNC
TST PAT ERR CNT
TST PATT BER
RESTART TST PAT ((ENTER))
LOOPBACK WITH ETHERNET DATA INTERFACE
Usage of the modems loopback capabilities in conjunction with the Ethernet data
interface can produce undesirable network loops. In order to run any type of data test
with an Ethernet interface you must utilize two modems connected back to back. Simply
using one modem and a loopback will not produce the desired results.
LOOPBACK
MN-DMD50 Revision 4
{NONE, 2047, 2^15-1, 2^23-1}
Allows the user to enable the tests listed above.
{NONE, 2047, 2^15-1, 2^23-1}
Allows the user to enable the tests listed above.
{YES, NO}
Yes indicates that the RX Test Pattern is in sync.
n
{NO SYNC, nnnn x 10
Displays the number of errors detected by the test pattern
checker.
-n
{NO SYNC, nnnn x 10
Displays the measured BER for the test pattern.
Allows the user to restart the test by pressing <ENTER> on the
keypad.
{IF, TERR TX/RX, BASEBAND TX/RX, NONE,
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
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.
}
}
-15 dB.
User Interfaces
TERR
4–39
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