Centralized

The third general configuration promoted for 2.5G and 3G implementation
purposes is the centralized approach, shown in Figure 7-6. The centralized
approach, as the name implies, facilitates the management of various markets
and systems from a centralized location. This particular approach has
the distinct advantage of providing economies of scale for platforms and a
uniformity for service creation and treatment. The centralized approach
could also be migrated easily from a regional structure-based system. The centralized example shows New York, Boston, and Mexico City as being
included in the configuration.

The chief disadvantage is that with the centralized approach local market
flexibility is lost. In addition, the backbone transport size may become
unwieldy because much of the traffic transported is destined for the Internet
and it would be better to terminate it locally. Therefore, only the control
of the system plus possibly the packet network should be centralized in
reality.