Abstract: A telecommunications card for use in a telecommunications terminal. The telecommunications card includes at least one programmable channel capable of satisfying different telecommunications standards based on configuration input. The different telecommunications standards, such as impedance, gain, and transhybrid impedance, relate to different countries. The card may include circuit blocks that provide different circuit paths that correspond to different telecommunications standards. The card may include a programmable codec for impedance and/or transhybrid balance.

Abstract: A telephone interface circuit for use in a digital loop carrier system. A transformer for coupling analog information and a switch responsive to a hook condition signal is provided. The hook condition signal provides an indication of the "on/off hook" condition of a corresponding telephone subscriber. The switch provides a closed circuit condition to "sink" a DC current when the corresponding telephone subscriber is "off hook" and an open circuit condition when the corresponding subscriber is "on hook". The telephone interface circuit further includes a capacitor serially coupled with the primary winding of the transformer, to prevent DC current from passing through the primary winding of the transformer. A combination telephone interface circuit that can be adapted for use as a remote terminal interface circuit or as a central office terminal interface circuit is also included. The combination interface circuit includes first and second circuit paths disposed in parallel with each other.