Comtech EF Data DMD50 Installation And Operation Manual page 98

DMD50 Universal Satellite Modem
Limitations of Fast Acquistion:
The maximum symbol rate for Fast Acquistion is 1028Ksps.
Fast Acquistion must be disable for rates greater than 1028Ksps.
Only supports QPSK and 8PSK in a NON-DVB MODE.
Does not support spectral inversion applications.
INPUT THRESHOLD (dBm) {-30 to 90 dbm}
EB/NO ALARM
DATA (menu)
DATA RATE (bps)
SYMB RATE (sps)
INNER FEC
TPC INTERLEAVER
MN-DMD50– Revision 3
Allows the user to adjust the low level threshold limit for input
power. Input power level below the threshold limit will trigger a
major alarm on the demodulator.
{0.0 to 9.90 db}
Allows the user to set the desired E
This setting is compared against the receive E
commands to the remote modem to increase or decrease
Transmit Power accordingly are sent.
{Refer to Technical Specs for Data Rates}
Allows the user to set the Data Rate in bps steps via the Front
Panel Arrows or Keypad.
Allows the user to view the Symbol Rate.
Viterbi
Optional FEC Rates:
Sequential
Trellis
Turbo ≤ 20Mbps
Turbo >20Mbps
CSC
DVB VIT
DVB Trellis
LDPC (B/O/QPSK)
LDPC (8PSK)
LDPC (8QAM)
LDPC (QPSK/OQPSK) {1/2, 2/3, 3/4}
LDPC (16QAM)
Allows the user to select the Rx Code Rate and Type
{DISABLED, ENABLED}
/N for the local receiver.
b o
/N and
b o
{1/2, 3/4, 7/8, None}
{1/2, 3/4, 7/8}
{8PSK}
{.793, .495, 3/4, 7/8}
{.750, .875}
{3/4}
{2/3, 5/6}
{3/4, 5/6, 7/8, 8/9}
{1/2, 2/3, 3/4}
{2/3, 3/4}
{2/3, 3/4}
{3/4}
User Interfaces
4–14