Comtech EF Data DMD-2050E - Manual (Page 14)

DMD-2050E Universal Satellite Modem Revision 2
Table of Contents MN-DMD2050E
vi
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