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Summary: See the EEVblog lab LIVE Panasonic KX-TVP100AL Voice Processing System: Panasonic KX-TD816AL Digital Super Hybrib System PABX Installation Manual NEC Zen Alpha Datasheets: 3W isolated DC DC converter MT8952 HDLC Protocol Controller MC14LC5480 PCB Codec Filter MT8941 T1/CEPT Digital Trunk PLL MT8952 HDLC Protocol Controller Forum HERE