All Internet connections, regardless of whether you're using DSL, fibre, cable or mobile, require modems. In the case of Streamyx, an ADSL2+ modem, which may either be a separate piece of equipment or built into the (wireless) router.
Am not sure about your particular setup, as to whether TM supplied you with BOTH an ADSL modem and a router, or whether the router is doing the modem function as well. I don't know if the ASUS router you bought has an ADSL modem built-in either.
If you have 2 separate pieces of equipment, it will look something like:
(Phone line IN) splitter (voice line to phone)/(DSL line OUT) --> (DSL line IN) ADSL modem (Ethernet line OUT) --> (Ethernet line IN) router
In this case, you may well have to find out whether your ADSL modem is acting like a bridge (in which case your router *may* be the one logging you in and so you need to instruct the router to connect to your Streamyx account using your Streamyx username/password) or as a router (in which case the modem is logging you in and replacing the router is in fact just a matter dropping it in).
If you have 1 integrated router, it will look like:
(Phone line IN) splitter (voice line to phone)/(DSL line OUT) --> (DSL line IN) router
In this case, your router (if it's not acting as a bridge) is doing the logging in and you need to give it the correct details.
thanks for the detailed explanation.
I think mine would be something like the first set-up.
I haven't tried the suggested solution as above because I've been busy, But I would think my asus router does not have ADSL function (as far as I would know, does not have modem functionality).
So I would have to use the existing streamyx ADSL router and use the ethernet as per your explanation but disable the wifi functionality, correct? - so it will use the wifi function on the asus router.