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Table of Contents DMD15/DMD15L IBS/IDR Satellite Modem
viii TM051 - Rev. 5.8
Section 3 – Operation
3.0 Theory of Operation ______________________________________________ 3-1
3.1 DMD15/DMD15L Functional Block Diagram____________________________ 3-1
3.2 Universal Interface Module (UIM) ____________________________________ 3-3
3.3 Synchronous Interface ____________________________________________ 3-4
3.4 G.703 Interface __________________________________________________ 3-4
3.5 Earth Station to Earth Station (ES-ES) Communications Port ______________ 3-5
(Async Port J9)______________________________________________________ 3-5
3.6 Terrestrial Loopback ______________________________________________ 3-5
3.7 Modem Status ___________________________________________________ 3-5
3.8 Baseband Processor Card _________________________________________ 3-8
3.8.1 Baseband Processing ___________________________________________ 3-8
3.8.2 Tx Baseband Processing _________________________________________ 3-8
3.8.3 Rx Baseband Processing_________________________________________ 3-9
3.8.4 Clock Selection ________________________________________________ 3-9
3.9 Monitor & Control (M&C) Subsystem _________________________________ 3-9
3.9.1 Asynchronous Serial Port #1 ______________________________________ 3-9
3.9.2 Serial Port #2 __________________________________________________ 3-9
3.9.3 Serial Port #3 __________________________________________________ 3-9
3.9.4 Front Panel Interface ___________________________________________ 3-10
3.9.5 Clock _______________________________________________________ 3-10
3.9.6 Watchdog Timer_______________________________________________ 3-10
3.9.7 Program Flash ROM ___________________________________________ 3-10
3.9.8 RAM ________________________________________________________ 3-10
3.9.9 Non-Volatile RAM______________________________________________ 3-10
3.10 Universal Modem ______________________________________________ 3-10
3.10.1 Modulator ___________________________________________________ 3-10
3.10.2 Demodulator_________________________________________________ 3-11
3.11 DMD15/DMD15L Clocking Options_________________________________ 3-11
3.11.1 SCTE: Serial Clock Transmit External _____________________________ 3-11
3.11.2 SCT: Serial Clock Transmit _____________________________________ 3-11
3.11.4 EXT EXC: External Clock_______________________________________ 3-11
3.11.5 BNC EXC: BNC External Clock __________________________________ 3-11
3.11.6 BAL EXC: Balanced External Clock_______________________________ 3-11
3.11.7 IDI: Insert Data In_____________________________________________ 3-12