This picture shows an Acorn Atom with the issue 1 Econet board fitted. On the right hand side we can see that set of wires has been soldered to the Econet connector points provide a connection point to the network.
Many thanks to Philip Mulrane for this picture of the Acorn Atom Econet card from 2006 which I updated in April 2018 using the original image size of 1152 pixels.