Figure 8.9 shows the sample network used in
this study, representing a ubiquitous ring topology with eight add-drop sites. Here, each
add-drop location is either populated with ROAM nodes (EoWDM) or next-generation
multiservice SONET/SDH MSPP platforms (EoS). Furthermore, the ring circumference
is assumed to be 300 km to reflect larger MAN/WAN service settings, and all nodes are
evenly spaced. This increased geographic span is chosen as it mandates the use of preline
and inline EDFA devices in the ROADM solution to, for example, stress CAPEX costs.
This network has been evaluated for EoS and EoWDM provisioning for various full-rate
EPL service scenarios. Owing to the larger regional nature of the ring, it is assumed that
the traffic is evenly distributed and arrives from enterprise and other provider clients.
Figure 8.9 Sample network used in economic assessment study
???Stacked??? Next-Generation SONET/SDH
MSPP
3
8
7
6
4
1
2
5
Two-Fiber Metro Ring Network
ROADM with Ethernet Thin-Mux Blades
Add-drop site
Two-fiber 1:1 protection
(sub-50 ms)
Transponders
Thin-mux
(FE, GigE)
Preamp
AWG
Add-drop switch
Post-amp
Gigabit Ethernet,
10 Gigabit
Ethernet
Fiber and WDM 229
This contrasts with smaller metro-edge rings that exhibit more hubbed traffic patterns
[3].
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