Electric power system network is including province control center, city control center, power plan and transformer station.
In province control center, connect Aliwei EID3000 series digital gateway with PBX by E1 ports. Set GK module in Aliwei IAD as top GK. At the same time set standby GK in another equipments as well as network management and billing system.

In city control center, connect Aliwei EID3000 modulization analog gateway or fixed analog gateway EIA20X with PBX. Set GK in Aliwei gateway or other equipments as sub GK.

To power plan and transformer station, set Aliwei IAD 4-32 ports according the actual condition. If PBX existed before, set EIA2004/O and connect it with PBX. If the new transformer station have not connect PSTN, set Aliwei IAD and configure it as PPPOE dial mode.

The calls between whole networking will be free.