FXO Port Tuning Support

The Acme Packet 1100 supports Foreign Exchange Office (FXO) port tuning because the on-board echo canceller might not work efficiently under some circumstances. For example, the hybrids on the analog line cause echo while converting between 2 and 4 wires, and the long cable plants yield imperfect impedance matches. Tuning the FXO ports can reduce the echo and mitigate the quality issues by calibrating the line impedance, which helps the echo canceler to work more efficiently. Oracle recommends tuning the FXO port whenever you detect an audible voice quality issue.