| 摘要 |
PURPOSE:To improve the utilizing efficiency of a line and to prevent ineffective registration by stopping the charging registration of a 5-count circuit at the count state after a called party advanced hook-on is detected in a charging trunk, using a prescribed period of pulse as a forced cut supervisory time and using a periodical pulse to apply forced cut at the called party advanced hook- on. CONSTITUTION:The circuit consists of the 5-count circuit comprising PA-PE relays, a charging registration relay (M relay), a called party response supervisory relay (E relay), a called party response memory relay (CH relay), a line hold relay (CO relay) and a called party advanced hook-on detection relay (COA relay). Moreover, a detour prevention diode D and prescribed period pulse supply terminals PU, AL are provided. The COA relay is operated through the incoming of a prescribed period pulse PU so as to detect the advanced hook-on of the called party. Further, the charging registration is conducted by the operation of the M relay according to an L pulse and as the operating condition, the M relay is activated by the operation of the 5-count relays PA-PE, that is, the PA relay operation and PB relay operation. |
