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Loopbacks are performed to check the continuity on SDH, Ethernet, or OTU ports. The ports can be configured for facility loopback and terminal loopback. The exact location of failure can be detected using loopbacks. You can perform facility and terminal loopbacks to test the electrical and optical (STM-n) connectivity of the node. When a facility loopback is operated on optical ports, AIS is sent downstream.
NOTE 1: All Line cards support both client side and line side loopback.
NOTE 2: For loopbacks performed on OTU ports, refer to the document TJ1600 R5.3 OTN and DWDM User Interface Guide, TPN: 170-DOC000082-E.
CAUTION: Facility loopback and terminal loopback are traffic affecting. Application of facility or terminal loopback on the near end port (with respect to NMS server) of a remotely managed node will result in loss of connectivity with the node and the downstream network. Hence, while applying loopbacks, the node should be provided with IBC protection or should have a personal placed at the site of the node to avoid loss of connectivity.