Abstract: A connection device for switching electrical signals includes primary offtakes with multiple contacts with at least on pair of conductors carrying an incoming signal leading to each of these; a multiple incoming plug or point fitted with an equivalent number of contact terminals to the conductors carrying a signal, which are connected to the terminals; a multiple outgoing plug or point connected to the incoming multiple plug or point; the same number of outgoing conductors as there are contact terminals on the outgoing plug or point forming pairs each carrying an outgoing signal; secondary offtakes with multiple contacts with at least one pair of outgoing conductors carrying an outgoing signal leading to each of these devices for selective, revisable connection of pairs of terminals on the incoming plug or point to pairs of contacts on the primary offtakes and pairs of terminals on the outgoing plug or point with pairs of contacts on the secondary offtakes.