METHOD FOR INCREASING DYNAMIC RANGE IN IA 2-WIRE HALF DUPLEX WIRELINE INTERFACE FOR SYSTEMS USING DSP BASED ADAPTIVE SIGNAL CANCELLATION
Original Publication Date: 1999-Jun-01
Included in the Prior Art Database: 2002-Aug-06
Products utilizing a DSP based adaptive signal cancellation method for removing the inbound (receive - from station to landline) component from the outbound (transmit - from landline to station) signal path in 2-wire wireline half-duplex mode of operation can experience failure to detect TRC tones or digital signahng control data for large in- bound signals that saturate either the outbound coarse gain adjustment or the A/D CODEC. This would occur when the landline connection has high attenuation and the station must be aligned with high inbound output levels.