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Ticket 20180103_1

Ticket Number: 20180103_1Ticket State: CLOSED
Ticket Opened: 2018-01-03 09:03Ticket Closed: 2018-01-04 16:38
Ticket Description: Interruption of optical links between Stein (AG) and Villigen

Problem Description:

Since 05:53 on Wednesday Jan 3, 2018, our optical links between Stein (AG) and Villigen are down. Thanks to redundancy, no services are currently affected.


From 2018-01-03 05:53 until undefined
Impact: no more redundancy
Service: P2P/OPN
Sites: ETHZ-BSSE-zh1-ba1

From 2018-01-03 05:53 until undefined
Impact: no more redundancy
Service: network access
Sites: RKAU, Syngenta


2018-01-04 17:05
End of work, ticket closed.

2018-01-04 08:50
All links up again. Some subtle tuning of the optical links is still required to compensate the extra attenuation.

2018-01-04 07:30
Fiber owner's repair team is on site. As the existing cable seems unstable and cannot easily be repaired, our link Stein - Villigen is temporarily moved to an alternative cable. There is a loss of geographical resilience in the local loop.

2018-01-03 18:00
Second fiber interrupted too.

2018-01-03 17:00
The fiber provider informs that the break is "outdoor". A temporary bypass will possibly be patched Thursday morning. In parallel, the provider will try to assess and fix the damaged cable.

2018-01-03 13:45
Measurements from Stein localize the fiber break a few kilometers to the east. We alert the fiber provider, who will assemble a team to go to their substation nearby and measure from there.

2018-01-03 11:53
Only one of the fibers is interrupted. Physical inspection by "remote hands" in Stein and Villigen did not show any visible cabling problems. We will go onsite.

2018-01-03 09:08
Calls to the fiber provider and PSI did not reveal any known problems. We continue to investigate.

For all questions about this ticket, please send mail to noc@switch.ch
or call +41 44 268 15 30.