Comtech EF Data DMD-2050E Especificaciones descargar pdf (Pagina 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 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.

: 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.

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Comtech EF Data DMD-2050E Especificaciones Pagina 148

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