The Metro Network
The metro is simply the first span of the network that connects subscribers and businesses to the WAN. The different entities serviced by the metro include residential and business customers, examples of which are large enterprises (LEs), small office/home office (SOHO), small and medium-sized businesses (SMBs), multitenant units (MTUs), and multidwelling units (MDUs) (see Figure 1-1).
Figure 1-1. The Metro
The portion of the metro that touches the customer is called the last mile to indicate the last span of the carrier's network. In a world where the paying customer is at the center of the universe, the industry also calls ...