Circuit Protection Types
The following table describes the circuit types that can appear on the Circuits tab.
 
Protection Type
Description
N/A
Circuit protection is not applicable.
2F MS-SPRing
The circuit is protected by a two-fiber multiplex section-shared protection ring (MS-SPRing).
4F MS-SPRing
(ONS 15454 SDH only) The circuit is protected by a four-fiber MS-SPRing.
MS-SPRing
(ONS 15454 SDH only) The circuit is protected by both a two-fiber and a four-fiber MS-SPRing.
SNCP
The circuit is protected by subnetwork connection protection (SNCP).
DRI
The circuit is protected by a dual-ring interconnect.
1+1
The circuit is protected by a 1+1 protection group.
Y-CABLE
(ONS 15454 SDH only) The circuit is protected by a transponder (TXP) or muxponder (MXP) card Y-cable protection group.
SPLITTER
(ONS 15454 SDH only) The circuit is protected by the protect transponder (TXPP_MR_2.5G) splitter protection.
Protected
The circuit is protected by diverse SDH topologies, for example, an MS-SPRing and an SNCP, or an SNCP and a 1+1 protection group.
2F-PCA
The circuit is routed on a protection channel access (PCA) path on a two-fiber MS-SPRing; PCA circuits are unprotected.
4F-PCA
(ONS 15454 SDH only) The circuit is routed on a PCA path on a four-fiber MS-SPRing; PCA circuits are unprotected.
PCA
(ONS 15454 SDH only) The circuit is routed on a PCA path on both two-fiber and four-fiber MS-SPRings; PCA circuits are unprotected.
Unprot (black)
The circuit is not protected.
Unprot (red)
The circuit created as a fully protected circuit is no longer protected due to a system change, such as removal of an MS-SPRing or 1+1 protection group.
Unknown
A circuit has a source and destination on different nodes and communication is down between the nodes. This protection type appears if not all circuit components are known.

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