Some like the PON,
FSO, and Copper solutions discussed in this book are restricted to providing OAM on a
link-level only (which by itself is insufficient), often based on standards such as EFM
OAM. Established solutions such as SONET, RPR, and WDM do, however, offer a fairly
robust OAM capability (albeit in some cases not at the service level).
Widely deployed transport solutions such as SONET and WDM are also well positioned
to support a unified management capability since Service Providers typically
deploy these solutions in a multi-vendor context (i.e., with other SONET, switching,
and routing vendors whose management systems often have to interwork to deliver
a service).
Rapid provisioning, which translates to speed to market, is generally quite poor
across the entire solution set save for MPLS and RPR. As Ethernet becomes more
prevalent, this capability will become a differentiator to Service Providers. Table 16.6
summaries the solutions with respect to this attribute.
A snapshot of how the different commercial solutions fare with respect to complying
with Carrier Ethernet attributes is provided in Table 16.7.
Commercial
Solution Service Resiliency Protection Restoration
Copper Marginally supported Partially supported
Access link only
Fully supported
HFC Marginally supported
Impacts bandwidth
Partially supported Partially supported
PON Not supported
Only proprietary solutions
exist currently
Not supported
Only proprietary solutions
exist currently
Not supported
Only proprietary solutions
exist currently
WDM Fully supported Fully supported Fully supported
Rerouting capabilities
FSO Marginally supported Partially supported
Path only
Fully supported
TDM Fully supported Substantially supported
Diverse routing
Fully supported
SONET Fully supported Fully supported Fully supported
RPR Fully supported Substantially supported
Wrap or steer or both
Fully supported
Bridging Fully supported Substantially supported
end-to-end protection
switching not standardized
Substantially supported
MPLS Fully supported Substantially supported
At the network layer
Fully supported
WiMax Marginally supported Partially supported Fully supported
TABLE 16.
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1120
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1125
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1128
1129
1130
1131
1132
1133
1134
1135
1136