Ethernet WANs
Lesson 1: Metro Ethernet
As a technology, Ethernet began life as a LAN technology only, mainly because Ethernet distance limitations made it impractical for creating the longer links in WAN services. Over time, fiber-based Ethernet Layer 1 standards kept improving, both in speed and in distance. The result: WAN services providers can and do use Ethernet links to offer WAN services, both on the edge with customer access links, and in the core of the provider’s network.
One particular Ethernet-based private WAN service uses a similar model as Frame Relay. The access links use Ethernet standards instead of leased lines, and the routers ...
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