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CHAPTER 1
E-Series Overview
1-2
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).
Figure 1-1 E-series router communicating over T1/T3 lines
Figure 1-2 E-series router communicating over DSL lines
T1/T3
OC3
Internet
Remote
access
router
ERX
Remote
access
router
Hub
Hub
Desktop
PC
PC
Desktop
g013033
Core
router
ERX
PC
Home office
DS3 OC3
Internet
PC
Home office
Remote
access
router
Hub
DSLAM
Desktop
PC
g013034
Core
router