Nortel Optical Multiservice Edge 6130, Руководство по планированию, Страница: 17 / 292

Introduction 1-5
Planning Guide NT6Q92MA Rel 1.0 Iss 1 Standard September 2006
The OME6130 also supports Virtual Concatenation (ITU-T G.707 compliant)
with support at the VC-12-nv, VC-3-nv and VC-4-nv SDH rates. A maximum
of 48 ms of differential delay is supported.
Along with VCAT the OME6130 also supports value added capabilities such
as soft protection via Link Capacity Adjustment Scheme (LCAS - G.7042).
LCAS has been specifically developed to overcome static link provisioning. It
enables service providers to efficiently offer dynamically-allocated bandwidth
as well as hitless throttling of the capacity of a VCAT link (or Virtual
Concatenated Group) by adding or removing VCs as required.
LCAS provides a soft protection and load-sharing mechanism to automatically
decrease the link capacity if a VC path experiences a failure and automatically
increases the link capacity when the network fault is repaired. This capability
provides an extra level of network and service resiliency by facilitating the
support of SLAs through graceful service degradation when necessary. In
particular, during network and service restoration LCAS can support hitless
bandwidth expansion and contraction thereby reducing service interruptions in
the event of network failure and easing network operations and maintenance
actions.
TDM switching
In the OME6130 architecture, traffic is switched between working and
protection line interfaces via the switch matrix in the 2x155/622M aggregate
circuit pack.
All ingress service traffic is mapped into VC-11, VC-12, VC-3 or VC-4
containers and directed towards the switch matrix which is configured to
switch the incoming traffic to the appropriate line interface. The switch matrix
allows any input channel to be connected to any output channel. Hairpinning
is also supported between client ports.
Network management
The OME6130 is managed as an integral part of Nortel Networks' market
proven end-to-end optical portfolio management capabilities. This framework
supports a sophisticated and highly customizable desktop providing
centralized topology view and fault management, centralized launch pad for a
full suite of management applications, easy to use nodal managers and
seamless network element reach-through for Nortel Networks' complete
optical networks portfolio. These network management capabilities are
supported by the Optical Manager and Optical Application Platform, such as
OMEA and Optical Network Manager (
formerly known as Preside ), in
alignment with Nortel Networks overall optical networks portfolio.