Are the FXO cards polarity sensitive (reversed tip and ring)?
Yes. The FXO cards will not function properly if the tip and ring are reversed. My loop start circuits work but my groundstart circuits do not. What is wrong? The ground start circuits require connection to the central office ground in order to obtain a ground reference. In non-central office installations, earth ground must be connected (third power wire or cold water pipe) to signal ground per installation instructions. • For PD4/2A: Frame ground and circuit ground terminals must be referenced to earth ground. • For BB-24: Connect TB1 terminals 2 & 3 and connect terminal 3 to earth ground. How can I easily configure a voice tandem circuit? Pulsecom’s TANDEM card provides an easy-to-use 4-wire interface. Other cards require a 6-wire interface. Back to top Compatibility: Are the PCAU modules compatible with HD-Radio? No, HD-Radio requires 20KHz analog and digital signal transmissions which the PCAU does not support. The new HD-PCAU does support these signals as well as the RBDS needed
