Comtech EF Data MD2401 - Manual (Page 38)

MD2401 L-Band Multi Demod Installation and Operation Manual User Interfaces
MN-MD2401 4–6
Revision 7
Conv Decoder: Viterbi {1/2, 3/4, 7/8}
Optional FEC Rates:
Trellis 8PSK {2/3}
Turbo {1/2, 3/4, 7/8, 0.793, 0.495}
Allows the user to select the Rx Code Rate and Type.
Differential Decder {On, Off}
Allows the user to enable or disable the Differential Decoder.
Having the decoder enabled ensures proper phase lock. May
not be adjustable in some modes.
Descrambler Control {ON, OFF}
Allows the user to enable or disable the descrambler operation.
Descrambler Selection {NONE, V.35-IESS, V.35 CITT, V.35 EF, IBS, Reed-Solomon
Scrambler (Reed Solomon Codec), CCITT, V.35FC,,
V.35EF_RS (Reed Solomon Codec), TPC SCRAMBLER
(Turbo Codec)}
Allows the user to select the descrambler type.
Spectrum: {Normal, Inverted}
Allows the user to invert the direction of rotation for PSK
Demodulation. Normal meets IESS Specification.
2047 Test: {NONE, 2047}
Allows the user to enable the receive test pattern
listed above.
Buffer Clock Polarity: {NORMAL, INVERTED}
Allows the user to select the Buffer Clock Polarity for the Tx
Terrestrial Clock relative to the Tx Data. If G.703 Interface is
selected, this selection cannot be changed.
Buffer Clock Selection: {RXSAT, SCTE, SCT}
Shows the current active buffer clock source.
IF Loopback: N/A
Terr Loopback: N/A
Base Loopback: N/A
Data Invert: {Normal, Inverted}
Allows the user to invert the Rx Data polarity.
Buffer/msec: {0 - 32 msecs}
Allows the user to set the Doppler Buffer Size in msec.
Raw BER: Displays the estimated channel error rate (before decoding)
measured by the modem. This window is active continuously and
is above the Gel Tab area.