Here is the link that helped me to set it up.
http://miniliew.blogspot.com/2011/05/bye-bye-singtel-2wire-5012nv.html

Architecturally, the Singtel Fibre modem provides a single Cat6 cable with 3 VLANs tagged to it. In order to make use of the network, VOIP and MIOTV separately, there is a need to split these 3 items into individual connections so that “dumb” routers or layer 3 routers can make use of them. Based on recommendations from friends, i made use of a CISCO SLM2008T which cost SGD$159 to do this. Cheap and relatively trouble free. However, i noticed that the above blog doesn’t map to my Layer 2 switch so i think the below steps would serve as a reminder to how i did it in principle.

The way to do it without using the lousy router provided by Singtel is essentially to make use of your own managed switch. One with VLAN support in order take the single Cat6 and split them into 3 separate components.

1. VLAN 10 – Internet
2. VLAN 20 – VOIP? MIO?
3. VLAN 30 – VOIP? MIO?

If you are only interested in getting internet working like me, you would only be interested in VLAN 10.

The overview steps would be

1. Create your VLANs required
2. Define your port membership. Assign the incoming port from the Fibre modem to be a member of ALL 3 VLANs. But assign the OUTGOING ports (i.e. the one going into your router or devices) to only be ONE member of the VLAN that you want. e.g. if you use port 1 as the incoming port of your layer 2 switch, and you want port 2-4 as the ports connected to your home router udner VLAN 10, port 1-4 would all need to be a member of VLAN 10. if you want port 5-6 to be members of VLAN 20, then port 1, 5-6 would need to be members of VLAN 20. etc etc. Also make sure that the OUTGOING ports are untagged while the INCOMING ports are tagged. In the above example, port 1 would be tagged but port 2-6 would all be untagged.
3. Define individual port settings. Now you need to set the individual ports such that they are for general access and behave like a normal switch port. When you set this up, make sure that the port settings should be general access and not trunked or anything fancy. You would tag the port again at this stage to the VLAN number that you want. So based on the example in point (2), you would setup ports 2-4 individually with port settings of VLAN tag 10 and behave like a general access port.

Once that’s done, you should be able to get a public IP address from ports 2-4 with the incoming broadband cable plugged into port 1. Extending any port from 2-4 to your original home network would then be the same as before… each with its own public IP address.