Although
this work is in its early stages, it may lead to a very tight integration (cost savings)
between the Ethernet packet-switching and SONET/SDH-DWDM circuit-switching
layers. This is particularly germane for unified MSPP platforms that implement Layer
1 and 2 capabilities.
Finally, another noteworthy development is the Layer 1 VPN (L1 VPN) framework [17],
which defines ???infrastructure virtualization??? at the SONET/SDH and DWDM layers.
228 Chapter 8
Indeed, this standard is very well-aligned with various intra-carrier and carriers??™ carrier
business models. For example L1 VPN technologies will allow organizations to purchase
virtual DWDM networks and offer customized EPL or EPLAN services over them. This
new paradigm has the potential to dramatically lower barriers to entry in the Carrier
Ethernet market, as entrants will no longer have to deploy or lease their own physical
fiber-optic infrastructures. L1 VPN remains an active focus area today within the IETF
and ITU-T (Study Group 13).
Economic Assessment
This section presents a brief economic assessment of high-grade Ethernet services over
fiber. Specifically, the EoWDM and EoS schemes are chosen for comparison, as they are
best-suited for supporting genuine MAN/WAN carrier-grade EPL services and they are
the most likely strategies for incumbents.
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