Expansion of infrastructure. The recommended
network has to enable as simple and eff ective expansion
as possible in terms of the number of users without
signifi cant alterations in the basic infrastructure.
It is also necessary to secure the expansion of capacity
on the central location and POP dots arranged in the
area. This request is closely related to the potential
changes of the future services which would require
expansion of aggregate links from the user to the
POP dots and further to the central location. This
parameter is divided into three other parameters that
the future network should enable.