Table 11.4 summarizes the typical deployment scenarios for EoS
and MSPPs.
Figure 11.9 The MSPP and dedicated EoS networks
OC-48
Dedicated ring
(Customer A) MSPP
OC-192
Interoffice ring
(shared)
Central office
Central
office
MSPP
Fast
Ethernet
Fast
Ethernet
Fast
Ethernet
OC-48
Dedicated ring
(Customer B)
Central office
MSPP
MSPP
MSPP
MSPP MSPP MSPP
DS-n
DS-n
DS-n
DS-n
Gigabit
Ethernet
Gigabit
Ethernet
Gigabit
Ethernet
Gigabit
Ethernet
OC-N
OC-N
Emulates
a LAN
Emulates
a LAN
MSPP MSPP
SONET/MSPP 317
Ongoing Developments
When compared with Ethernet or SONET, EoS (in particular the standard GFP/VCAT/
LCAS mapping) is a relatively young technology. Several trends are emerging as this
fundamental EoS technology matures, and its applications grow in breadth and depth.
Increasing EoS Integration
The first major trend is the integration of EoS into network elements other than
MSPPs. Although the MSPP remains the primary vehicle for the deployment of EoS,
the technology provides benefits that extend beyond MSPPs. Other network elements
that have begun adopting EoS technology include the following:
?– Low-cost access devices Compact, ultra-low cost systems that include EoS
(possibly along with traditional DS-n over SONET), but without the full functionality
of an MSPP.
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