| 摘要 |
PURPOSE:To connect lots of time division switch devices without increasing a block rate of a communication channel of a common loop highway by increasing the switch multiplexity of a time division switch section and extending the sub network. CONSTITUTION:Line exchange units CSU30-0-30-3 having a time division switch device and expansion line exchange unit ECSU20 are connected in a loop by a common loop highway 10- I . Moreover, units CSU30-4-30-7 and an ECSU20 are connected in a loop by a common loop highway 10-II. The units CSU30-0-30-7 store respectively various terminals and the communication among the units CSU30-0-30-3 and the CSU30-4-30-7 uses a communication channel on the common loop highways 10- I and 10-II in the rate of one channel/one communication via the unit ECSU20 and the communication among the units CSU30-0- 30-3 or the CSU30-4-30-7 uses one loop highway. |
