A module and kit for coupling at least one telephone service signal to at least one telephone device over a wiring. The network includes: a wiring having at least two conductors for carrying multiple time-domain multiplexed digitized voice channels; an exchange side device coupled to the wiring and operative...http://www.google.fr/patents/US7274688?utm_source=gb-gplus-shareBrevet US7274688 - Telephone communication system over a single telephone line
Telephone communication system over a single telephone line
