The NBN box is the termination for the optical fibre, it is also known as a Network Terminating Unit. From there you have a LAN cable, I am not sure if they use cat 5 or cat 6 cable, to their T-Gateway or what ever internal equipment they install
The T-Gateway has 1x 1000Mbt port and 3x 100Mbt ports. It also has a standard telephone port on the back which would then feed you phones.
