Radyne DMD2050 Operation Manual page 8

Table of Contents DMD2050 Universal Satellite Modem
Section 3 - Theory of Operation ................................................................................3-1
3.0 DMD2050 Hardware _______________________________________________ 3-1
3.0.1 DMD2050 L-Band/IF Printed Circuit Card _____________________________ 3-1
3.0.2 DMD2050 Baseband Processing Printed Circuit Card____________________ 3-2
3.0.3 Enhanced Interface Printed Circuit Card ______________________________ 3-4
3.1 DMD2050 Functional Block Diagram __________________________________ 3-4
3.1.1 Front Panel_____________________________________________________ 3-4
3.1.2 Baseband Processing ____________________________________________ 3-4
3.1.3 Tx Baseband Processing __________________________________________ 3-5
3.1.4 Rx Baseband Processing__________________________________________ 3-6
3.1.5 Monitor & Control (M&C) Subsystem _________________________________ 3-6
3.1.5.1 Remote/Terminal Port ___________________________________________ 3-6
3.1.5.2 Async Port____________________________________________________ 3-6
3.1.5.3 Ethernet Port __________________________________________________ 3-6
3.1.5.4 Clock ________________________________________________________ 3-6
3.2 Earth Station to Earth Station Communications Port ______________________ 3-7
3.3 Terrestrial Loopback _______________________________________________ 3-7
3.4 Modem Status ____________________________________________________ 3-7
3.5 Baseband Processor Card __________________________________________ 3-7
3.5.1 Baseband Processing ____________________________________________ 3-8
3.6 DMD2050 Clocking Options ________________________________________ 3-10
3.6.1 Clock Selection ________________________________________________ 3-10
3.6.2 SCTE: Serial Clock Transmit External _______________________________ 3-11
3.6.3 SCT: Serial Clock Transmit _______________________________________ 3-11
3.6.4 EXT CLK: External Clock, J16 _____________________________________ 3-11
3.6.5 BNC EXC: BNC External Clock, j16_________________________________ 3-11
3.6.6 IDI: Insert Data In _______________________________________________ 3-11
3.6.7 SCR: Serial Clock Receive _______________________________________ 3-11
3.6.8 EXT IF REF: External IF Reference_________________________________ 3-12
3.7 Transmit Timing _________________________________________________ 3-12
3.7.1 EXT CLK as TX Clock Source (MIL-188-114A, RS-422) _________________ 3-12
3.7.2 SCT or SCTE __________________________________________________ 3-12
3.7.3 G.703 Interface ________________________________________________ 3-12
3.7.4 Ethernet Data Interface (Optional) __________________________________ 3-12
3.8 Receive Timing __________________________________________________ 3-12
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