Economic Assessment
This section examines a small network that highlights the economic benefits of EoS.
Figure 11.11 illustrates this example network, which comprises five customer locations
(A through E), two central offices (COs), and one data center. Two access rings connect
the customer locations to the COs, and an interoffice facility (IOF) ring connects the
COs and the data center.
In this example, the service provider uses two types of EoS-equipped network elements
to build the network:
?– MSPPs, which are capable of supporting OC-12, OC-48, and OC-192 SONET interfaces,
Ethernet interface cards that support EoS transport (Ethernet/GFP/VCAT/
LCAS), and Ethernet interface cards that support RPR/SONET.
?– Small ???micro-MSPPs??? (?µ-MSPPs) that support OC-12 SONET interfaces and EoS
transport only.
Table 11.5 highlights the typical costs of these systems.
Figure 11.11 EoS in an example network
??? -MSPP8 A
B
C
D
E
OC-12
Access ring
OC-192
Interoffice ring
Central
office X Central office/
Data center
?µ-MSPP 9
?µ-MSPP 8
Central office Y
MSPP
5
MSPP
6
MSPP
7
MSPP
1
MSPP
3
OC-48
Dedicated ring
Ethernet
Ethernet
Ethernet
Ethernet
Ethernet
Ethernet
Ethernet
MSPP
4
MSPP
2
IP services
network
Ethernet
services
network
322 Chapter 11
This network supports the three key applications of EoS (refer to Section ???Typical
Deployment/Scenarios???):
?– EPL service delivery In the example network, customer locations A and B have
E-Line services to customer location D.
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