Card of connection in network (Networking) for central series ZP3. The connection allows in network point on the verge of up to 255 head offices of the series ZP3. Equipped with warning LED's of transmission and receipt. When of the case to overcome 1500 m of distance between 2 nodes or when there could arise problems of EMC's interferences there is recommended a convertor of copper / fiber. The card connects directly on the motherboard of the head office without requirement of wired up additional.