User Interfaces
DMD50 Universal Satellite Modem
4-14
TM118 – Rev. 1.1
INPUT THRESHOLD (dBm)
{-30 to 90 dbm}
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.
EB/NO ALARM
{0.0 to 9.90 db}
Allows the user to set the desired E
b
/N
o
for the local
receiver. This setting is compared against the receive
E
b
/N
o
and commands to the remote modem to increase
or decrease Transmit Power accordingly are sent.
DATA (menu)
DATA RATE (bps)
{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.
SYMB RATE (sps)
Allows the user to view the Symbol Rate.
INNER FEC
Viterbi
{1/2, 3/4, 7/8, None}
Optional FEC Rates:
Sequential
{1/2, 3/4, 7/8}
Trellis
8PSK
{2/3}
Turbo
≤
20Mbps
{.793, .495, 1/2, 3/4, 7/8}
Turbo >20Mbps
{.750, .875}
CSC
{3/4}
DVB VIT
{1/2, 2/3, 3/4, 5/6, 7/8}
DVB Trellis
{2/3, 5/6, 8/9}
Allows the user to select the Rx Code Rate and Type
TPC INTERLEAVER
{DISABLED, ENABLED}
Allows the user to disable or enable TPC Interleaver.
Valid only for Radyne turbo codes TPC.495 and
TPC.793.
DIFF CODING
{ENABLED, DISABLE}
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.
SCRAMBLER SEL
{NONE, V.35-IESS, V.35 CITT, V.35 EF, IBS
w/Optional Framing and optional Reed-Solomon,
Reed-Solomon Scrambler w/Optional Framing,
CCITT, V.35FC, OM-73, V.35EF_RS, TPC
SCRAMBLER (Turbo Codec), DVB, EDMAC}
Allows the user to select the descrambler type.
SCRAMBLER CTRL
{ON, OFF}
Allows the user to enable or disable the descrambler
operation.
SAT FRAMING
{1/15 (IBS), 1/15 (Async), 96 Kbps (IDR), EDMAC,
EFAUPC, SCC, EFFICIENT D&I, None}
Used with IDR, IBS, or Asynchronous Interface Only.
Allows the user to select the Framing Type.
Summary of Contents for DMD50
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Page 20: ...DMD50 Universal Satellite Modem Introduction TM118 Rev 1 1 1 3...
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Page 27: ...Installation DMD50 Universal Satellite Modem 2 6 TM118 Rev 1 1...
Page 53: ...Theory of Operation DMD50 Universal Satellite Modem 3 26 TM118 Rev 1 1...
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Page 162: ...DMD50 Universal Satellite Modem Appendix A TM118 Rev 1 1 A 3...
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