3ah; proprietary
solutions exist)
WDM Partially supported
Limited to fi ber facilities only
Partially supported
E-Line only
Fully supported
FSO Substantially supported
Limited under certain weather
conditions
Fully supported Not supported
TDM Fully supported Fully supported Fully supported
SONET Partially supported
Limited to fi ber facilities only
Substantially supported
Fully supports E-Line and
marginally supports E-LAN
Fully supported
Generally not required
RPR Partially supported
Limited to fi ber infrastructures
in ring topology
Fully supported Fully supported
Bridging Substantially supported
Some standards not yet ratifi ed
Fully supported Marginally supported
Standards lacking
MPLS Fully supported
IETF-defi ned standards enable
multi-vendor interoperability
Fully supported
E-Line using pseudowires,
E-LAN using VPLS
Fully supported
WiMax Partially supported
Limited by distance
Fully supported Not supported
6 Service Providers commonly use their own or leased infrastructure to deliver services.
Evolution of Carrier Ethernet Solutions 507
Reliability If Carrier Ethernet is to be widely employed as the convergent (access) platform
to deliver mission-critical applications enterprises need to be assured of its robustness
before they migrate from legacy services such as ATM and Frame Relay.
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