Applications
Issue 8.0 July 2002
2-25
It should be emphasized that the primary need for this feature is to increase the
span capacity and thus increase bandwidth efficiency for “Path-in-Line”
applications. As a review, a “Path-in-Line” application carries path-switched ring
traffic within the FT-2000 line-switched ring. Tributaries of the FT-2000 ring
provide transport between DDM-2000 OC-3 and/or SLC-2000 ring nodes. The
path-switched ring protects traffic with dual-fed signals. The node that originates
the traffic sends it in both directions (East and West) from the node where the
traffic enters the ring. The node where the traffic exits the ring selects one of the
two received signals.
“Path-in-Line” applications are always administered as “Permanent”. Other
examples of these types of applications include:
■ Real-Time Networks—that support time-sensitive control functions.
■ ATM and Bridge/Router Traffic—for this application customers may
already provide their own rerouting, in case of failure, and may not need
FT-2000 protection switching.
■ Video Transport—which sometimes requires non-preemptible transport
without protection.
■ Dual-Wire Center Architecture—a self healing network that provides
end-to-end survivable DS1 and DS3 business access services.
An application that uses the “Temporary” protection access state is in support of
DACS-based network restoration. For this application the service traffic is
temporarily made unprotected so that a restoration can use protection access that
is non-preemptible.
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