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CHAPTER 1
ERX System Overview
1-6
Where the ERX System Fits In
Figure 1-5 and Figure 1-6 illustrate the position of the system as an edge
router in an end-to-end Internet network. Communications with the
system can take place over a variety of media. In Figure 1-5, the
customers are businesses using T1/T3 communication lines. In
Figure 1-6, the customers are using digital subscriber lines (DSLs) with a
DSL access multiplexer (DSLAM).
Figure 1-5 ERX system communicating over T1/T3 lines
Figure 1-6 ERX system communicating over DSL lines
Desktop
Remote
access router
Hub
Hub
Remote
access
router
ERX system
Desktop
Internet
Core router
OC3
T1/T3
Home office
Remote
access router
Hub
Desktop
Internet
DSLAM
DS3
OC3
ERX system
Core
router