Lumen provides the ingress state as an informed estimation of the health of the signal being provided by the source. The ingress state is calculated by examining the health of the signal being presented to the first piece of equipment in the signal flow chain that can be actively monitored. Because Lumen does not maintain active monitoring equipment at all customer demarcations, the first monitored equipment may be at a location other than the demarcation point. This means that the ingress state presented by Lumen systems is an informed estimation of the health of the signal being provided, not an authoritative declaration.
Should there be no active monitoring equipment in the signal flow chain prior to long-haul transport, Lumen will determine the ingress state to be “unknown” should a service impairment be detected.