Comtech EF Data DMD-2050E Installation And Operation Manual page 14

DMD-2050E Universal Satellite Modem
Table of Contents
3.11.12.4 Estimating PSD Ratio from Satmaster ........................................................................ 3-47
3.11.12.5 Estimating PSD Ratio Using Spectrum Analyzer ....................................................... 3-47
3.11.13 DoubleTalk Carrier-in-Carrier Specifications ................................................................. 3-48
3.11.14 Carrier-in-Carrier Summary ............................................................................................ 3-49
3.11.15 Glossary .......................................................................................................................... 3-49
3.12 TPC and Low Density Parity Check (LDPC) Coding ........................................................... 3-51
3.12.1 LDPC versus TPC ............................................................................................................... 3-52
3.12.2 TPC and LDPC Summary ................................................................................................... 3-56
3.13 Reed-Solomon Codec ................................................................................................................ 3-56
3.13.1 Reed-Solomon Operation in the DMD2050E ..................................................................... 3-56
3.13.2 Reed-Solomon Code Rate ................................................................................................... 3-57
3.13.3 Interleaving ......................................................................................................................... 3-57
3.14 DMD2050E Automatic Uplink Power Control (AUPC Operation) ..................................... 3-58
3.15 Asynchronous Overhead Operation (Async Port / ES-ES Communications) ..................... 3-58
3.16 Standard IBS Mode .................................................................................................................. 3-60
3.17 Asynchronous Multiplexer Mode ........................................................................................... 3-61
3.18 ESC Backward Alarms ............................................................................................................. 3-61
3.18.1 To Disable the ESC Backward Alarms ............................................................................... 3-62
3.19 Satellite Control Channel (SCC) ............................................................................................. 3-62
3.19.1 SCC Framing Structure ....................................................................................................... 3-62
3.19.2 Aggregate Data Rate ........................................................................................................... 3-64
3.19.3 Overhead Rate Comparison ................................................................................................ 3-65
3.19.4 Actual Overhead Rate Calculation ...................................................................................... 3-66
3.20 SCC OVERHEAD CHANNEL SETUP .................................................................................. 3-67
3.21 Locating the DMD2050E ID Code Operational Procedure .................................................. 3-69
CHAPTER 4. USER INTERFACES ....................................................................................... 4-1
4.1 User Interfaces ............................................................................................................................ 4-1
4.2 Front Panel Interface .................................................................................................................. 4-1
4.2.1 VFD - Vacuum Fluorescent Display ..................................................................................... 4-2
4.2.2 Arrow Keys ........................................................................................................................... 4-2
4.2.3 Numeric Keys ....................................................................................................................... 4-2
4.2.4 LED Lights ............................................................................................................................ 4-3
4.3 Parameter Setup .......................................................................................................................... 4-4
4.3.1 Select a Parameter ................................................................................................................. 4-4
4.3.2 Enter and Save a New Parameter .......................................................................................... 4-4
4.3.3 Change a New Parameter Before Saving .............................................................................. 4-4
vi
Revision 2
MN-DMD2050E