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customer base spread across a wide geographic area. The extent of scalability required
is obviously a function of the Service Provider??™s (real/virtual)6 footprint. Table 16.3 summarizes
the solutions with respect to this attribute.
Packet-oriented solutions such as MPLS, WiMax, and Bridging were expressly designed
to scale and consequently can scale better than solutions such as Copper, which
is inherently limited in its geographic reach. Pure transport solutions such as WDM
are also extremely well suited to scale (again, this was the primary reason for WDM??™s
popularity outside of Ethernet) whereas wireless-based solutions (such as FSO and
WiMax) are also limited by their underlying technology to serving meaningfully in
metro access networks.
TABLE 16.1 Support of Carrier Ethernet Attribute??”Standardized Service Support
Commercial
Solution Ubiquity Ethernet Services Circuit Emulation
Copper Partially supported
Limited to dry copper facilities
within a km or so
Partially supported
E-Line only
Not supported
HFC Partially supported
Limited to HFC facilities only
Partially supported
E-Line only
Not supported
PON Partially supported
Limited to fi ber facilities only
Partially supported
E-Line only
Not supported (in IEEE
802.
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