AUTOMATIC CONVERTING METHOD FOR APPOINTING LOOP CENTRAL OFFICE LINE IN KEY TELEPHONE SYSTEM AND THEREOF APPARATUS

摘要

PURPOSE: A method for automatically changing loop office line designation in a keyphone system and an apparatus therefor are provided to improve a state of an office line through a conference with a PX or PABX by checking the state of the office line through a board for metering calls. CONSTITUTION: A frequency for metering a call is transmitted to a PX or PABX at a uniform interval through an office line(S12). A level sensor senses a DC level and discriminates whether the level is normal(S13,S14). If the level is not normal, an alarm is transmitted to a keyphone and a message is displayed(S20). If the alarm is ended in the keyphone, a loop designation office line is changed to a just front number(S21,S22).