Xerox 3300MFP Service Manual - Page 63

Signal Transition of DAA Solution Theory of Operation Line Interface Signal of Tel Line and LSD is Analog Signal. There is A/D, D/A Converter in LSD, so Analog Signal from Tel Line is converted in Digital through A/D Converter in DAA and transfer to SSD by DIB Capacitor. Digital Signal from SSD is converted to Analog by D/A Converter in DAA and transfer to Tel Line. 1 0 1 CX86710(SFX336) DSP SSD System Side Device Transformer Transformer Digital CX20493 LSD Line Side Device Tel Line Ext Line Analog s3300mfp-156 Transformer transfer Clock from SSD to LSD and Clock Frequency is 4.032 MHz. LSD full wave rectifies Clock to use as inner Power supply and also use as Main Clock for DIB Protocol Sync between LSD and SSD. Transformer transfer Clock by separating Primary and Secondary, and amplifies Clock Level to LSD by Coil Turns Ratio 1:1.16. Clock Clock is supplied by transformer from SSD to LSD, and there is PWROUT to adjust output impedance of Clock Out Driver is inside SSD and CLKSHIGH Resistor to adjust duty of HLPWR Resistor and Clock. SSD CLKP LSD CLKN DIBP DIBN s3300mfp-157 Clock from SSD to LSD has Differential structure of 180 phase difference for Noise Robustness DIB Data transfer Data from SSD to LSD by Transformer, and also transfer specific data from LSD to SSD. After transferring data from SSD, RSP is transferred and LSD recognizes RSP and change LSD to output Driver transfer Data to SSD. DIB Data form SSD to LSD by Transformer has Differential structure of 180 phase difference between DIBP and DIBN for Noise Robustness. Phaser 3300MFP Service Manual 2-21