In the 1990s,
Ethernet was first a cheaper interface to connect various types of network gear used
in provider POPs and COs, basically carrying data traffic over Ethernet. These connections
were between routers and Ethernet switches initially, but Ethernet interfaces
were added to optical gear, both SONET/SDH and WDM, then to DSLAMs, and more
recently to PON and Ethernet FTTH gear.
As Ethernet grew as a customer connection technology and network product to
network product connection, Ethernet showed up in most types of metro equipment.
The Ethernet Market Opportunity 115
Manufacturers and providers started figuring out how to add more Ethernet capabilities
to accommodate growing diversification of Ethernet services. Technologies, including
VCAT/LCAS/GFP over SONET/SDH, RPR, VDSL, and especially MPLS, have paved
the way for Ethernet to take its place as a respected telecom grade option for metro networks.
Being part of Ethernet, these technologies naturally support data/packet traffic
and add support for existing customer TDM and data traffic types by delivering resiliency,
fast recovery, options for new services, rings, mesh, and marriage into existing
carrier networks using SONET, SDH, DS1/DS3, and copper and fiber technologies.
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