Since then, EoS has matured quite a bit. The late 1990s saw the birth of the multiservice
provisioning platform (MSPP), a network element that combined SONET transport,
SONET switching, and data capabilities such as EoS. Soon after, several key technologies,
including the generic framing procedure (GFP), virtual concatenation (VCAT), and link
capacity adjustment scheme (LCAS), helped to increase the bandwidth efficiency of EoS
implementations and to lower their costs.
More recently, service providers have focused on the deployment of Carrier Ethernet
services. This has heightened interest in EoS solutions because the underlying SONET
technology enables these solutions to provide strong support for a number of the Carrier
Ethernet attributes, most notably reliability, quality of service (QoS), and standardized
services.
This chapter explores the technological innovations that have enabled EoS to support
Carrier Ethernet services and looks at the unique and important role of the MSPP.
It also explores many of the issues that service providers face as they deliver Carrier
Ethernet services using EoS solutions??”and the issues that equipment vendors face as
they develop the EoS solutions to support these services.
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