Comtech EF Data DMD-2050E Installation And Operation Manual page 49

DMD-2050E Universal Satellite Modem
Table of Contents
CHAPTER 2. INSTALLATION .............................................................................................. 2-1
2.1 Unpacking and Inspection .......................................................................................................... 2-1
2.2 Installation Safety ....................................................................................................................... 2-2
2.3 Installation Considerations ........................................................................................................ 2-2
2.3.1 Location ................................................................................................................................ 2-3
2.3.2 Airflow .................................................................................................................................. 2-3
2.3.3 Temperature .......................................................................................................................... 2-3
2.3.4 Electrical Power .................................................................................................................... 2-3
2.3.5 Cables .................................................................................................................................... 2-4
2.4 Initial Configuration Check ....................................................................................................... 2-4
2.4.1 Standard Factory Configuration ............................................................................................ 2-4
2.5 Modulator Checkout ................................................................................................................... 2-5
2.5.1 Initial Start Up ....................................................................................................................... 2-5
2.5.2 Factory Terminal Settings ..................................................................................................... 2-5
CHAPTER 3. THEORY OF OPERATION ............................................................................. 3-1
3.1 DMD2050E Hardware ................................................................................................................ 3-1
3.1.1 DMD2050E L-Band/IF Printed Circuit Card ........................................................................ 3-2
3.1.2 DMD2050E Baseband Processing Printed Circuit Card ....................................................... 3-3
3.1.3 Enhanced Interface Printed Circuit Card .............................................................................. 3-5
3.2 DMD2050E Functional Block Diagram .................................................................................... 3-5
3.2.1 Front Panel ............................................................................................................................ 3-5
3.2.2 Baseband Processing ............................................................................................................. 3-5
3.2.3 Tx Baseband Processing ....................................................................................................... 3-6
3.2.4 Rx Baseband Processing ....................................................................................................... 3-7
3.2.5 Monitor & Control (M&C) Subsystem ................................................................................. 3-7
3.2.6 Terminal Port ........................................................................................................................ 3-8
3.2.7 Modem Remote Communications (RLLP) ........................................................................... 3-8
3.2.8 Ethernet M&C Port ............................................................................................................... 3-9
3.2.9 Modem Monitor Status ......................................................................................................... 3-9
3.3 Internal Clock ............................................................................................................................ 3-10
3.4 Loopback Features (Terrestrial & IF) .................................................................................... 3-10
3.5 DMD2050E Clocking Options .................................................................................................. 3-13
3.5.1 Clock Selection ................................................................................................................... 3-13
3.5.2 TX Clock Options ............................................................................................................... 3-14
3.5.2.1 SCTE: Serial Clock Transmit External ........................................................................... 3-15
3.5.2.2 SCT: Serial Clock Transmit ............................................................................................ 3-15
3.5.3 RX Buffer Clock Options ................................................................................................... 3-16
3.5.3.1 RX SAT Clock ................................................................................................................ 3-16
3.5.3.2 SCTE: Serial Clock Transmit External ........................................................................... 3-16
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MN-DMD2050E