A major application of the E-series router is for private line aggregation—the consolidation of multiple high-speed access lines into one access point. See Figure 1.
In this application, the service provider can use a single router to offer high-speed access (FT1/FE1 through T3/E3) to thousands of subscribers. The individual subscriber lines can be multiplexed into T3 lines by the service provider and fed into the router. (The router can also accept unchannelized T3 or E3 connections from high-speed users and channelized E1 connections directly into the unit.) Once the traffic is received, the router then handles all IP packet processing, including the assignment of QoS and routing policies. The packets are then routed into the backbone network.
Figure 1: Private Line Aggregation with the E-series Router

The router supports a number of access and uplink methods; the most common pairings are listed in Table 4.
Table 4: Common Access/Uplink Pairings
|
Access |
Uplink |
|---|---|
|
PPP |
ATM, Fast Ethernet, Gigabit Ethernet, or POS |
|
Frame Relay |
|
|
ATM |