| 摘要 |
Time division, pulse code modulation switching system comprising a plurality of modulation-demodulation units or concentrator units, each including first converter means connected to subscribers for converting analog signals to pulse amplitude modulation signals and ensuring the inverse conversion, a pair of second converter means for converting said pulse amplitude modulation signals to pulse code modulation signals and ensuring the inverse conversion, two pairs of group highways connected to said pair of second converter means and each including a send group highway and a receive group highway, means for selectively connecting together the send group highway of a pair to the receive group highway of the other pair and means for selectively activating during a full time slot the second converter means and the connecting means and during a half time slot and in phase opposition the first converter means of two subscribers to be connected. |
