Comtech EF Data SDM-9000 Installation And Operation Manual page 13

SDM-9000 Satelite Modem
4.2.3.4 RX Interface Faults ................................................................................................................................... 4-29
4.2.3.5 Common Equipment Faults....................................................................................................................... 4-30
4.2.3.6 Backward Alarms ...................................................................................................................................... 4-30
4.2.4 Stored Faults/Alarms ........................................................................................................................................ 4-33
4.2.5 Utility................................................................................................................................................................ 4-35
4.2.5.1 Utility Modulator....................................................................................................................................... 4-37
4.2.5.2 Utility Demodulator .................................................................................................................................. 4-39
4.2.5.3 Utility Interface ......................................................................................................................................... 4-42
4.2.5.4 Utility System............................................................................................................................................ 4-45
4.2.5.5 Utility Modem Type.................................................................................................................................. 4-49
4.2.5.6 Utility Factory Setup ................................................................................................................................. 4-50
4.3 Clocking Options.................................................................................................................................................... 4-53
4.3.1 G.703 Interface Clocking.................................................................................................................................. 4-53
4.3.1.1 TX Timing................................................................................................................................................. 4-53
4.3.1.2 RX Timing................................................................................................................................................. 4-53
4.3.1.2.1 RX Timing (with Buffer) ................................................................................................................... 4-53
4.3.1.2.2 RX Timing (without Buffer) .............................................................................................................. 4-53
4.3.2 ECL/MIL-STD-188 Interface Clocking ........................................................................................................... 4-54
4.3.2.1 TX Timing................................................................................................................................................ 4-54
4.3.2.2 RX Timing................................................................................................................................................. 4-54
4.3.2.2.1 RX Timing (with Buffer) ................................................................................................................... 4-54
4.3.2.2.2 RX Timing (without Buffer) .............................................................................................................. 4-54
CHAPTER 5. THEORY OF OPERATION ........................................................................ 5-1
5.1 Display/M&C.......................................................................................................................................................... 5-1
5.1.1 Description........................................................................................................................................................ 5-1
5.1.2 Theory of Operation ......................................................................................................................................... 5-2
5.2 Modulator ............................................................................................................................................................... 5-4
5.2.1 Description........................................................................................................................................................ 5-4
5.2.2 Specifications.................................................................................................................................................... 5-6
5.2.3 Theory of Operation ......................................................................................................................................... 5-7
5.2.4 Theory of Modulation Types ............................................................................................................................ 5-9
5.2.4.1 Description ................................................................................................................................................ 5-9
5.2.4.2 QPSK Encoding/Modulation..................................................................................................................... 5-9
5.2.4.3 8PSK Encoding/Modulation...................................................................................................................... 5-10
5.2.4.4 16QAM Encoding/Modulation.................................................................................................................. 5-10
5.3 Demodulator........................................................................................................................................................... 5-11
5.3.1 Description........................................................................................................................................................ 5-11
5.3.2 Specifications.................................................................................................................................................... 5-11
5.3.3 Theory of Operation ......................................................................................................................................... 5-13
5.4 Viterbi Decoder ...................................................................................................................................................... 5-16
5.4.1 Description........................................................................................................................................................ 5-16
5.4.2 Specifications.................................................................................................................................................... 5-16
5.4.3 Theory of Operation ......................................................................................................................................... 5-17
5.5 Interface.................................................................................................................................................................. 5-18
5.5.1 Description........................................................................................................................................................ 5-18
5.5.2 Digital Interface Specifications ........................................................................................................................ 5-19
5.5.2.1 G.703......................................................................................................................................................... 5-20
Rev. 4
Preface
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