A network array (200) comprises a first network (201) having a plurality of first nodes (203, 204, 209), comprises a second network (202) having a plurality of second nodes (206, 209) and comprises a forwarder node (209). The forwarder node (209) constitutes one of the first nodes (203, 204, 209) and constitutes one of the second nodes (206, 209) to form a communication interface between the first network (201) and the second network (202) in such a manner that the forwarder node (209) functions as a slave in the first network (201) and as a master in the second network (202). The forwarder node (209) is adapted to communicate with the first network (201) using a first operation frequency and is adapted to communicate with the second network (202) using a second operation frequency which is different from the first operation frequency.