The four station Econet has 4 stations represented by the four upgrade kits, 8 Econet leads, 4 Y-leads, 2 terminators and Clock with PSU.
The two left hand Y-leads are joined by the inner DIN ports using an Econet lead, as are the two right-most Y-leads. The two Y-leads in the centre are connected to the Clock with two more Econet leads. The remaining outermost outlets on the Y-leads have terminator plugs fitted.
With the structure created, stations are added to the single-socket end of each Y lead with an Econet lead.