| 摘要 |
PURPOSE:To attain the omission of the network management of a common line signal system by using a channel in a trunk as a common line channel and applying the control to other voice channel. CONSTITUTION:Digital interface trunks 3, 4 are used to connect small scale digital exchange stations 1 and 2 with a digital transmission line 5. An optional channel is used as a common line channel among channels 1-n accommodated in the digital interface trunks 3, 4 and the others are used as voice channels, then the common line channel controls the voice channel. |
