This is the right-hand side of the Level 3 Clock. Here there are two Econet connectors. The Clock should be connected to an Econet in two adjoining sockets, as near to the middle of the network as possible. The idea is that the clock output from each of the sockets is sufficient to drive half of the network. The has the effect of increasing the potential lengths of network, and the Level 3 clock is designed to serve a maximum network length of about 500 yards.