7 test main menu and parameters – Comtech EF Data DMD-2050E User Manual
Page 148
DMD2050E Universal Satellite Modem
User Interfaces
MN-DMD2050E Revision 2
4–36
4.4.7 TEST Main Menu and Parameters
TEST MENU
TX TEST PATTERN
{NONE, 2047, 2^15-1, 2^23-1} Enables the tests listed above.
RX TEST PATTERN
{NONE, 2047, 2^15-1, 2^23-1} Enables the tests listed above.
PATTERN SYNC
{YES, NO}
Yes indicates that the RX Test Pattern is in sync.
TST PAT ERR CNT
{NO SYNC, nnnn x 10n}
Displays the number of errors detected by the
test pattern checker.
TST PATT BER
{NO SYNC, nnnn x 10-n}
Displays the measured BER for the test pattern.
RESTART TST PAT ((ENTER))
Press ENTER to restart the test.
LOOPBACK
{IF, TERR TX/RX, TERR TX,
TERR RX, NONE,
BASEBAND TX/RX,
BASEBAND RX, 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.
IMPORTANT
LOOPBACK WITH ETHERNET DATA INTERFACE
Unwanted network loops can result from using the loopback
function with the Ethernet data interface. Make sure to use two
modems connected directly to each other for any Ethernet
interface data testing. Undesirable results will occur if you use
one modem and a loopback
Carrier TYPE
{NORMAL, CW, DUAL,
OFFSET, POS FIR, NEG FIR}
Sets 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.