ZyXEL Communications IES-1000 - ADSL Ports (AAM1008); Ethernet Port; Other Factory Defaults

IES-1000 Hardware Installation Guide
Hardware Connections 4-13
Make sure you use a 100-240VAC/1A, 50/60Hz power source.
Figure 4-13 Connecting the Power Cord to the IES-1000 and a Power Source