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Technical Specifications DMD15/DMD15L/DMD15/DMD15LL/DMD15/DMD15LIBS/IDR Satellite Modem
7-2 TM051 – Rev. 5.8
FEC: Viterbi, K = 7 at 1/2, 3/4, and 7/8 Rate,
Rate Sequential 1/2, 3/4, 7/8 (optional)
Trellis 2/3 (Optional)
Turbo Product Code (Optional)
3/4 Rate (0.793) - (64,57) x (64,57)
1/2 Rate (0.495) - (32,26) x (32,26) x (4,3)
(Turbo supported at all modulation types)
Decoder Options: Reed-Solomon
Descrambler: CCITT V.35 or IBS (others optional)
Acquisition Range: Programmable ±1 kHz to ± 32 kHz
Sweep Delay Value: 0 sec to 900.0 sec. in 100 msec. Steps
Reacquisition sweep 0 top 32000 Hz in 1 Hz steps.
7.2 Plesiochronous Buffer
Size: 2 ms to 32 ms
Centering: Automatic on underflow/overflow
Centering Modes: IBS: Integral number of frames
IDR: Integral number of multiple frames
Clock: Transmit, External, Rx Recovered or SCT (Internal)
7.3 Monitor and Control
Transmit and Receive Frequencies
Transmit and Receive Data Rates and Code Rate
Differential Encoding On/Off
Scrambler On/Off
Spectrum Normal/Inverted
Clock Source, Polarity and Frequency
Transmit Carrier On/Off and Tx Level
Tx Test Modes
Demodulator Input Level
E
b
/N
o
Buffer Size, Clock, Center Buffer
Sweep Range and Delay
IDR/IBS Backward Alarms, Modem/Switch Alarms
IDR/IBS Framing, Drop and Insert Mode and Flags
Loopback; Terrestrial and Satellite
7.4 DMD15/DMD15L Drop and Insert (Optional)
Terrestrial Data: 1.544 Mbps or 2.048 Mbps, G.732/733
Line Coding: AMI or B8ZS for T1 and HDB3 for E1
Framing: D4, ESF, or SLC-96 for T1 and PCM30 (30 channels) or
PCM31 (31 channels for E1).
Time Slot Selection: n x 64 contiguous or arbitrary blocks for Drop or Insert.
Time Slots: TS1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 16, 20, 24, 30
Data Rates: 64, 128, 192, 256, 320, 384, 512, 640, 768, 960, 1024, 1280,
1536, 1920 Kbps