When your Zyxel modem is delivered it will have three Ethernet ports for internet and one for O2 TV. Setting ports for the MULTI service can be done via web configuration.
First go to the link http://10.0.0.138/.
A login window will appear in a short time. To log in you need to know your username and password. If you have not changed them yet, both your username and password will be “admin”.
After loggin in choose Advanced Setup and then LAN Bundling in the left-hand menu.
A page with port configuration will appear on the right-hand side. Choose IPTV Multi on the second line, and save by clicking on Apply/Save.
Saving your changes will take about 10 seconds. All the ports are set after the page is refreshed.
Now you can close the browser. Your modem is set for MULTI service. LAN2 and LAN3 ports are ready for connectiong up to two set-top-boxes.