1st, you have to take the official Swisscom WLAN-Router Centro Grande
2nd, you have to install the Router at the central distribution room for all connections. I hope, there is a patchfield with all connections to the rooms and also the landline connection....
3rd, you have to patch all conections from the Router ports (4x LAN and 1x phone) to the desired ports of the patchfield
4th, if you dont' have enough LAN-Ports at the Router, you have to add the official 5-Port switch from Swisscom to expand the numbers of LAN-Ports
5th, for better WLAN connections in the whole house, you can install some additional WLAN-APs in the desired room(s)
good luck, POGO 1104