| 摘要 |
PURPOSE:To realize the call monitoring at an optional place, by setting the channels of a subscriber or a monitor request subscriber by means of a time shared switchboard via a multi-subscriber channel trunk and then converting the aural information given from the monitor request subscriber into a soundless data at the input side of the multi-subscriber channel trunk. CONSTITUTION:When a subscriber C monitors the channels of subscribers A and B, the request information of the monitor request subscriber C is connected to a multi-subscriber channel trunk TWT via a central controller and controlled to be written into control memories PTC1-PTC4 of primary time switches PTS1-PTS4 respectively. At the same time, the subscribers A and B are connected to a secondary time switch STS4 of the input side of the trunk TWT via a space switch SSW through time slots TSalpha and TSbeta, and the subscriber C is connected to the switch STS4 in the same way through a time slot TSgamma. Then the call information of the subscriber C is written into the switch PT4 through a switch PT3, and the subscribers A and B are prevented from hearing the voiceless data in place of the information of the time slot TSgamma. In such way, the monitoring is possible. |
