Network access apparatus includes a slave unit, including a plurality of subscriber ports adapted to be linked to respective subscriber lines, and a multiplexer for multiplexing among the ports. A master sub-system, is connected to at least one trunk line of a first public network, in a location remote...http://www.google.fr/patents/US6834038?utm_source=gb-gplus-shareBrevet US6834038 - Protection against master unit failure in remote network access multiplexing
Protection against master unit failure in remote network access multiplexing
