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Circuit protection is not applicable.
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The circuit is protected by a two-fiber multiplex section-shared protection ring (MS-SPRing).
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(ONS 15454 SDH only) The circuit is protected by a four-fiber MS-SPRing.
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(ONS 15454 SDH only) The circuit is protected by both a two-fiber and a four-fiber MS-SPRing.
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The circuit is protected by subnetwork connection protection (SNCP).
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The circuit is protected by a dual-ring interconnect.
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The circuit is protected by a 1+1 protection group.
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(ONS 15454 SDH only) The circuit is protected by a transponder (TXP) or muxponder (MXP) card in a Y-cable protection group.
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(ONS 15454 SDH only) The circuit is protected by the protect transponder (TXPP_MR_2.5G) splitter protection.
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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.
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The circuit is routed on a protection channel access (PCA) path on a two-fiber MS-SPRing; PCA circuits are unprotected.
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(ONS 15454 SDH only) The circuit is routed on a PCA path on a four-fiber MS-SPRing; PCA circuits are unprotected.
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(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.
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The circuit is not protected.
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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.
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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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