[Sunet-fail] SUNETTICKET-8114, Unscheduled, Closed, Degraded signal on SVA

Ticket Number : SUNETTICKET-8114 Ticket Type : Unscheduled Ticket Status : Closed Ticket Summary : Degraded signal on SVA Ticket Scope : Link Ticket Opened : 20220919 10:44 UTC Ticket Closed : 20220922 6:32 UTC Problem Start : 20220918 19:34 UTC Problem End : 20220921 12:31 UTC Affected organisations: * NORDUnet, Funet, UMU ---- Description: * Degraded signal on SVA which is causing Gain/tilt Abnormal on 1-3-BRMN. ---- Impact: * Nothing at the moment. Services that will be affected if we need to perform service affecting maintenance/troubleshooting. SU-S003868 - TUG - UME8 NDN1 191.55THz SU-S003800 - Funet alienwave sva-ume8 SU-S002107 - Backbone ume8-r1 - sva-r1 SU-S003074 - IP to UMU2 SU-S002307 - Backbone umu-r2 - sva-r1 ---- Update: * 20220919 10:48 UTC Investigating. ---- * 20220919 13:08 UTC Degraded signal on the direction from HND5 to SVA. Power dropped by almost 6db. ---- * 20220919 14:00 UTC Provider is investigating the issue. ---- * 20220920 16:48 UTC Update from Provider: We have localized the damage and managed to narrow down an area where the damage could have occurred on the cable. Technicians are on route to surveil the area and see if we can see any potential source of the damage. Meanwhile we have contacted subprovider to be ready to repair the damage. The damage seems to be in the vincinity of Bergsåkers Travbana in Bergsåker. We sincerely apologize for the lack of updates and will continue to update you with the latest on the repair. When repairing the damage it will most likely be nessesary to cut service for a short while in order to repair/resplice the cable and we will notify you of a timewindow once we know more. ---- * 20220920 19:24 UTC Update from Provider: We have now been in contact with technicians on site. Our contractor will need several permits to dig and repair the fault as the location of the damage is next to a road. Due to the above, the technicians cannot start troubleshooting tonight, but will start tomorrow morning when all permits are in place. Apologies for the delay and consequence this causes you. We will update you as soon as we have new information on the matter. ---- * 20220921 7:46 UTC ---- * 20220921 9:40 UTC Technicians have now gotten what they need to start troubleshooting, so far they have not managed find any damage on the cable. They are still troubleshooting the issue. ---- * 20220921 13:08 UTC Update from Provider: We identified the root cause as road workers piercing the surface of the 96 pair cable and dragging it out of its shell, causing a macrobend on the cable. This caused the dampening. We have straightened the cable out and confirmed with OTDR, own equipment and verifying with customers that your connections are back to original values. We will arrange for a planned works in the future for a permanent solution, as cutting the service to all customers in the middle of the day is unviable. We will get back to you with a formal planned works notification once this work is planned and ready. ---- Final ticket report: * Degraded signal was observed in Sundsvall due to a bent cable. Provider has straightened out the cable and alarm has cleared. ---- -- For information about SUNET tickets and the sunet-fail list visit: http://www.nunoc.org/nunocweb/open_trouble_tickets.html