Simoco Xfin Blade Service Manual page 5

3.5.8 Line 1 & 2 (RJ45) .............................................................................................. 19
3.5.9 Facilities ............................................................................................................ 20
3.5.10 PSTN Port (RJ11) ............................................................................................. 21
4 TECHNICAL DESCRIPTION ................................................................................ 23
4.1 MMI Board.......................................................................................................... 23
4.1.1 Description ........................................................................................................ 24
4.2 Control Board.................................................................................................... 25
4.2.1 Circuit Board Layout ......................................................................................... 25
4.2.2 Circuit Description............................................................................................. 26
4.2.2.1 LEDs ....................................................................................................... 26
4.2.2.2 Test Points.............................................................................................. 26
4.2.2.3 DSP ........................................................................................................ 30
4.2.2.4 Power...................................................................................................... 31
4.2.2.5 IXP.......................................................................................................... 31
4.2.2.6 CoDec..................................................................................................... 32
4.2.2.7 Audio Interface........................................................................................ 32
4.2.2.8 PSTN Interface ....................................................................................... 33
4.2.3 Links ................................................................................................................. 33
4.3 Receiver and Transmitter Modules ................................................................. 36
4.3.1 Frequency Bands.............................................................................................. 36
4.3.2 Receiver............................................................................................................ 36
4.3.2.1 Front-end Filters and Rx Front-end Amplifier.......................................... 36
4.3.2.2 First Mixer and IF Section ....................................................................... 38
4.3.2.3 Quadrature Demodulator ........................................................................ 38
4.3.2.4 Receiver Audio Processing..................................................................... 38
4.3.3 Transmitter........................................................................................................ 38
4.3.3.1 Drivers and PA Stages............................................................................ 39
4.3.3.2 Tx Power Control .................................................................................... 41
4.3.3.3 Antenna Changeover and Harmonic Filter.............................................. 41
4.3.3.4 Transmitter Audio Processing................................................................. 41
4.3.4 Frequency Synthesis ........................................................................................ 42
4.3.4.1 General ................................................................................................... 42
4.3.4.2 PLL ......................................................................................................... 42
4.3.4.3 VCO ........................................................................................................ 42
4.3.4.4 Negative Bias Generator and Loop Filter................................................ 42
4.3.4.5 Phase Modulator..................................................................................... 43
4.3.4.6 Reference Oscillator ............................................................................... 43
4.3.5 RF Sub-Assembly Internal Control Logic .......................................................... 45
4.3.5.1 DSP and FPGA....................................................................................... 46
4.3.5.2 DSP Clock Oscillator............................................................................... 46
4.3.6 RF Sub-Assembly Internal Memory .................................................................. 46
4.3.6.1 Multiplexer .............................................................................................. 46
4.3.7 RF Sub-Assembly Internal Power Supplies ...................................................... 47
4.3.7.1 Power On Function ................................................................................. 47
4.3.7.2 Power Lines ............................................................................................ 47
TABLE OF CONTENTS
XFIN-BLADE-SM
PAGE 5