The transport will be divided between Ethernet (900o of all
traffic) and microwave radio (the other 10%). The leased lines
have a capacity of 100 Mbit/s each, whereas the radios offer 8
Mbit/s. The microwave radio is mainly used to provide
transport to outlying sites in the rural areas. The cost of a 100
Mbit/s Ethernet line is 2500 euros per month, while the radios
have a fixed cost of 8600 euros each. These costs are assumed
to decrease 500 per year. The core network is only taken into
account as a fixed cost per each BTS site, since the overall
cost of the core network is very low compared with the base
station network.
The figure below shows the logical structure of the SAE
network in more detail, including the relationship with the
WCDMA network.