Virtual Concatenation + LCAS;
Providing Scalable SONET/SDH Bandwidth
SONET and SDH are the primary low-level protocols for
all types of metro and long-haul traffic. They were
originally designed to provide static bandwidth connections
between points with a high degree of resiliency, which
is suitable for voice and ATM traffic.
As these networks are used more and more to carry data,
one major inefficiency is becoming apparent – the
lack of scalability in connection sizes. Modern Ethernet
links can provide bandwidth in very small increments,
using flow control, and can be changed in an instant.
SONET/SDH links at higher speeds are limited to factors
of four, however they are traditionally plagued by long
provisioning times. So while the SONET/SDH incumbents
have superior service guarantees and offer a complete
service, including
the profitable transport of voice traffic, Ethernet
based Metro Carriers are able to offer a better service;
buy exactly the bandwidth you need now and change it
at any time.
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