1. So there was already some appeal to Ethernet??”as evidenced by the
deployment of Ethernet-based Transport LAN Services (TLS) and Ethernet extension
services in the metro. There were, however, numerous additional benefits as well.
A key distinction from the other competitive solutions such as SONET/TDM, ATM,
and Frame Relay is the fact that there are significant benefits to both the end user
enterprises seeking a cost-optimal connectivity solution for their networking applications
and also to Service Providers typically offering such solutions (to enterprises)
[14]. These are discussed next and are grouped in Figure 1.11; ultimately, the fact that
Ethernet42 offers extremely compelling benefits to both these constituencies is key to
its increasing popularity beyond the LAN.
Note that beyond the LAN, Ethernet is delivered as a service to the end customer by
the Service Provider. This means there is a physical connection so customers can plug
straight into an Ethernet port at the customer premise LAN device (switch/router) and
carry Ethernet frames; it may also mean the ability to subscribe to multiple services
and applications (like Internet access, VoIP, etc.
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