Sub-Network Connection Protection (Sncp) - Alcatel-Lucent 1643 AMS User's Operation Manual

Traffic provisioning

Sub-Network Connection Protection (SNCP)

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Introduction
SubNetwork Connection (SNC) protection is used to protect the traffic for a
pre-selected path (path protection). This type of path protection can be used for VC-4,
VC-3 and VC-12 level.
SNC protection is characterized by sending the signal in both directions. When a fault
condition occurs the receive NE switches to the protecting line. The capacity for
protection cannot be used for any other traffic.
To be able to protect every provisioned path on an individual basis within a
subnetwork.
A provisioned subnetwork containing individually paths that are 1+1 protected against
service failures.
Principle
SubNetwork Connection (SNC) protection switching deals with protection against
transmission failures in and between Ring Add/Drop NEs. One leg is selected as a
designated worker and the other leg as a designated protecting. This means that the
capacity is used for protection even if the normal route is available. A trail continues to
use the working route until a fault condition occurs or an external switch request is
issued to switch to the protecting route. This type of protection is non revertive. This
means that when a traffic failure in the working route has been cleared, traffic will
remain on the protection route until a manual or forced switch is applied, or when a
failure occurs on the protection line. This behavior is irrespective of any service
restoration in the working route.
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8-18 Alcatel-Lucent - Proprietary
See notice on first page
365-312-807R7.2
Issue 4, May 2007