Degraded Optical Levels on Inter-Datacentre Metro Fibre Link

Update timeline

1. resolved Mar 04, 2026, 10:45 AM UTC

   Type: Incident Duration: 17 hours and 53 minutes Affected Components: , Wavelength Services, Datacenter Services → Mar 5, 04:38:25 GMT+0 - Resolved - The issue affecting the metro fibre link between our datacentres has now been resolved, and optical levels have returned to normal operating ranges. Services across the link remain fully operational, and no further issues are currently being observed. We are currently awaiting **RFOs** from the relevant fibre providers to confirm the underlying cause of the degradation. Further information will be shared if additional details become available. Mar 4, 10:45:00 GMT+0 - Investigating - We are currently investigating degraded optical receive levels in one direction of a metro fibre link between two of our datacentres. At this time, **no service outage or traffic impact** has been observed, and network services across the link remain operational. Monitoring has identified that the received light level in one direction is **significantly lower than the corresponding transmit level in the opposite direction**. Our network engineering team is reviewing the circuit and monitoring the link closely. Further updates will be provided as the investigation progresses. Mar 4, 11:00:00 GMT+0 - Identified - The issue has been identified as degraded optical receive levels in one direction of the metro fibre link between our datacentres. While services remain operational with **no current outage**, the fibre provider has been engaged to investigate the underlying infrastructure and determine the cause of the degraded light levels. During this investigation, there **may be brief periods of disruption** while testing or maintenance activities are carried out on the circuit. Further updates will be provided as more information becomes available. Mar 4, 13:36:31 GMT+0 - Identified - The fibre provider is actively investigating the degraded optical levels on the metro fibre link between our datacentres. Services across the link remain operational with **no current outage observed**. Our network engineering team continues to monitor the circuit closely while the provider conducts its investigation. Further updates will be provided as soon as additional information becomes available. Mar 4, 15:06:55 GMT+0 - Identified - The fibre provider is actively investigating the degraded optical levels on the metro fibre link between our datacentres. Services across the link remain operational with **no current outage observed**. Our network engineering team continues to monitor the circuit closely while the provider conducts its investigation. We are currently working with the fibre provider to organise a suitable maintenance window so that a **full outage of the fibre path can be taken with the least possible impact**, allowing further testing and investigation to take place. Further updates will be provided as soon as additional information becomes available.