The IEPC is an integrated power controller especially designed for feeding two- and four wire transmission lines. The IEPC is fully compatible to the CCITT recommendations on power feed at the "S"-interface. So the IEPC can be used in PABX/Central Office and in intelligent NTs. The IEPC supplies power up to four transmission lines. Each line is individually powered and controlled via microprocessor interface. An interrupt output signals any malfunction to the microprocessor.