Where E-Series Routers Fit In
Communications with the router can take place over a variety of media. Figure 1-1 and Figure 1-2 illustrate the location of E-series routers as an edge router in an end-to-end Internet network. In Figure 1-1, the customers are businesses using T1/T3 communication lines. In Figure 1-2, the customers are using digital subscriber lines (DSLs) with a DSL access multiplexer (DSLAM).
In Figure 1-3, the ERX-310 router is being used as an access router in a small POP location. The router is deployed by the service provider at the customer site as a CPE (customer premises equipment).