A digital transmission apparatus for subscribers, includes a switch function unit performing multiplexing into subscriber time slots by receiving as its input transmission signals communicated between subscriber side transmission lines and feeder transmission lines. The apparatus sets one or more lines...http://www.google.fr/patents/US5452286?utm_source=gb-gplus-shareBrevet US5452286 - Digital transmission apparatus for subscribers having switching function from active transmission line to protection transmission line
Digital transmission apparatus for subscribers having switching function ...
