DMD20/20LBST Universal Satellite Modem
Technical Specifications
MN-DMD20-20LBST Revision 14
7–3
Decoder Options
Reed-Solomon INTELSAT (DVB Optional, Custom
Rates Optional)
Descrambler
CCITT V.35 or IBS (Others Optional)
Acquisition Range
Programmable ±1 kHz to ± 255 kHz
Sweep Delay Value
100 msec to 6000 sec. in 100 msec Steps
7.4 Plesiochronous Buffer
Size
0 msec to 64 msec
Centering
Automatic on Underflow/Overflow
Centering Modes
IBS: Integral Number of Frames
IDR: Integral Number of Multi Frames
Clock
Transmit, External, Rx Recovered or SCT (Internal)
7.5 Monitor and Control
Remote RS-485/Terminal RS-232/Ethernet 10 Base-T/Web Browser,
DMD15 Protocol Compatible
7.6 DMD20/DMD20 LBST 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 and PCM-30 (PCM-30C) or
PCM-31 (PCM- 31C) 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, 31
Data Rates
64, 128, 192, 256, 320, 384, 512, 640,
768, 960, 1024, 1280, 1536, 1920 Kbps
Efficient D&I
Closed Network, Satellite Overhead 0.4%
Time Slots
1-31 Any combination
7.7 Terrestrial Interfaces
A variety of standard interfaces are available for the DMD20/DMD20 LBST modem in stand-alone
applications.
7.8 IDR/ESC Interface (Optional)
G.703 T1 (DSX1)
1.544 Mbps, 100-Ohm Balanced, AMI and B8ZS
G.703 E1
2.048 Mbps, 75-Ohm Unbalanced and 120-Ohm Balanced,
HDB3
G.703 T2 (DSX2)
6.312 Mbps, 75-Ohm Unbalanced and 110-Ohm Balanced,
B8ZS and B6ZS
G.703 E2
8.448 Mbps, 75-Ohm BNC, Unbalanced, HDB3
7.9 IBS/Synchronous Interface (Standard)
RS-422/-530
All Rates, Differential, Clock/Data, DCE
ITU V.35
All Rates, Differential, Clock/Data, DCE
RS-232
(DCE up to 200 Kbps)
ER-DMD20LBS-EA14 Rev -