As Service
Providers move to a Carrier Ethernet??“based packet-optimized network infrastructure,
they should still be able to provide these services. This requirement translates into
being able to transport these synchronous Time Division Multiplexing (TDM) digital
signals over an asynchronous Ethernet infrastructure. Or put another way, a TDM circuit-
switched network should be emulated over this packet infrastructure and provide
what is referred to as circuit emulation services (CES). In effect, these services tunnel
customers??™ TDM traffic over the Ethernet network, as shown in Figure 2.18. The customers??™
source and destination TDM equipment on either end is unaware of this circuit
emulation. Such CES typically run over standard E-LINE service.
With CES over Ethernet (CESoE), service providers can leverage the inherent advantages
of Carrier Ethernet??”flexibility, simplicity, and lowered OPEX,17 while delivering
legacy applications such as TDM voice and private lines (which still account
for a very large proportion of revenues for most Service Providers). Thus, with CESoE,
Service Providers can cost effectively offer a complete portfolio of emerging Ethernet
services along with the legacy services, obtaining an approximately 30 percent savings
in infrastructure costs, and OPEX can be realized by migrating to an unified Ethernet
infrastructure.
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