Comtech EF Data SDM-9000 - Manual (Page 13)

SDM-9000 Satelite Modem Preface
Rev. 4 v
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