| 摘要 |
PURPOSE:To attain the talking between a master station and any of slave stations and the multiple address from the master station to plural slave stations by utilizing a branch service of a high speed digital line and applying control from plural slave stations so as to bring the level of a high speed digital line to all logical 1. CONSTITUTION:A master station M is provided with a telephone set TM with a speaker, a channel panel CHM for a master station, and a time division multiplexer MUM for high speed digital line multiplexing various media. On the other hand, slave stations S1-Sn are provided with telephone sets TS1-TSn, channel panels for stave stations CHS1-CHSn and time division multiplexers MUS1- MUSn for high speed digital line multiplexing various media. The sender side of the channel panels for slave stations CHS1-CHSn is controlled to send all '1' at all times and when a handset of the telephone sets TS1-TSn of the slave stations is hooked off, the control is released by a reply signal by the operation. Moreover, the master station M and the slave stations S1-Sn are connected by a branch service line 10 being a high speed digital line. Thus, the multiple address from the master station to the plural stave stations and the talking between any of the slave stations and the master station are attained. |
