Examples where MSPPs provide access to Ethernet or IP-based services include
Qwest Internet Port, AT&T ACCU-Ring Network Access Service, and Verizon??™s Internet
Dedicated Ethernet service.
Figure 11.8 The MSPP and Ethernet access to Ethernet or IP services
OC-12
Access ring
MSPP
MSPP
MSPP
OC-48
Access ring
SONET
ADM
DS-n
Fast
Ethernet
DS-n
Fast
Ethernet
DS-n
OC-N
MSPP
Gigabit
Ethernet
Fast
Ethernet
OC-192
Interoffice ring
SONET
ADM
A
B
C
Central
office
Central
office
Central office/
Data center
100 Mbps access to switched Ethernet service
20 Mbps access to the Internet
500 Mbps access to an IP-VPN
MSPP
IP services
network
Ethernet
services
network
316 Chapter 11
Dedicated EoS Networks
In this scenario, a service provider deploys a network dedicated to a single customer??”
often a large corporation or an entity in one of the government, education, or medical
(GEM) vertical markets. The customer often wants MEF-compliant E-LAN service to
provide LAN-like connectivity among its sites, along with DS-n connectivity for PBXs
and other traditional telephony equipment, as Figure 11.9 illustrates.
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