Cisco Systems 10000 manual - page 8

Cisco Systems, Inc.
All contents are Copyright © 1992–2003 Cisco Systems, Inc. All rights reserved. Important Notices and Privacy Statement.
Page 8 of 12
Leased-Line Aggregation Architectures and Applications
Channelized Aggregation Architecture
TheCisco 10000 Series was introduced to the service provider market more than three years ago. From the start, it
has focused on the aggregation of low-speed, very-high-density leased-line circuits by using channelized interfaces
(Figure 7).
Figure 7
Channelized Architecture
TheCisco 10000 Series offers the widest suite of channelized modules, ranging from copper E1/T1 to optical O-12/
STM-4, allowing the Cisco 10000 Series the diversity for all leased-line applications. Recent channelization
enhancements to the optical modules help ensure worldwide coverage of configuration options. In a typical Cisco
10000 Series application, the provider usually situates the aggregator in a centrally located POP and backhauls
individualcustomer connections from central offices across the SONET/SDH networks. Add-drop multiplexers are
devicesat either end of the optical network that provide aggregation of low-speed customer connections (T1/E1) and
aggregationinto higher-order optical interfaces in the central POP. Popular Layer 2 encapsulations include PPP and
High-Level Data Link Control (HDLC), both with comprehensive support on the platform. Numerous IP services
are fully supported over channelized interfaces, including IP QoS, ACLs, IP multicast, and security services.
Frame Relay Aggregation
Frame Relay continues to dominate service provider markets in many regions and is the preferred technology for
Layer2 VPNs. Over the past three years, many providers have taken advantage of their investment in Frame Relay
networks for overlay IP services (Figure 8).
IP
Channelized
Interface
IP
TDM/SONET
T1/E1
PPP or HDLC
SONET/SDH
Cisco
10000
Series IP Network