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The circuit is protected by a 1+1 protection group.
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(ONS 15454 and ONS 15600 only) The circuit is protected by a 2-fiber bidirectional line switched ring (BLSR).
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(ONS 15454 and ONS 15600 only) The circuit is protected by a 4-fiber BLSR.
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(ONS 15454 and ONS 15600 only) The circuit is protected by both a 2-fiber and a 4-fiber BLSR.
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(ONS 15454 and ONS 15600 only) The circuit is protected by a dual-ring interconnect (DRI).
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A circuit with connections on the same node is not protected.
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Circuit protection is not applicable.
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The circuit is protected by diverse SONET topologies, for example, a BLSR and a unidirectional path switched ring (UPSR) or a UPSR and 1+1.
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(ONS 15454 and ONS 15600 only) The circuit is routed on a protection channel access (PCA) path on a 2-fiber BLSR. PCA circuits are unprotected.
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(ONS 15454 and ONS 15600 only) The circuit is routed on a PCA path on a 4-fiber BLSR. PCA circuits are unprotected.
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(ONS 15454 and ONS 15600 only) The circuit is routed on a PCA path on both 2-fiber and 4-fiber BLSRs. PCA circuits are unprotected.
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(ONS 15454 only) The circuit source and destination are on MXPP_MR_2.5G and TXPP_MR_2.5G cards. These cards provides splitter (line-level) protection.
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A circuit with a source and destination on different nodes is not protected.
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A circuit created as a fully protected circuit is no longer protected due to a system change, such as removal of a BLSR or 1+1 protection group. This protection type is not applicable to DWDM.
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The circuit is protected by a UPSR.
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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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(ONS 15454 only) The circuit is protected by a transponder or muxponder card Y-cable protection group.
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