Combined S0 4 wire and 2 wire Up ISDN interface circuit uses the same transformer module with additional jumpers to select connection

摘要

A combined S0 4 wire and 2 wire Up ISDN (Integrated Services Digital Network) interface circuit uses the same transformer module with two additional jumpers to select the interface type and can operate in the NT/TE mode of S0 connection using both S0 transformer modules.