How a saboteur cut our fiber optic cable 3 times in one week


So this year we had to deal with the first saboteur who was intentionally destroying our fiber optic cables. Originally we thought it was a complete coincidence that you experience once or twice in a lifetime, but when it happened 3 times in a week we knew we had to intervene.

What do you think fiber optic cables are made of? Usually it is a plastic fibre (rarely glass) in a protective film. So definitely nothing tasty that you intend to chew on a regular basis. Unfortunately, a family of martens who live near one of our unofficial trails (designated for non-productive purposes) really enjoyed it.

When our optics were first bitten through, we took it as a once-in-10-years coincidence. Only they did it again a few days later. And last Sunday, late in the day, once more, and even in several places at once.

Repairing a fiber optic cable is not a problem for us. We have our own quality optics welder and three colleagues who are trained to use it. One of them has already done a lot, including an operational intervention at heights in heavy rain (he says he will never do it again).

Welding fiber optic cables in the middle of the forest.

The only problem was to find a suitable fiber optic cable.

Fortunately, we went to Prague on Tuesday to sort out some legalities (more on that next time). On the way we called our supplier of fiber optic cables to see if he had any that the beasts in Hluboká Nad Vltavou would not like.

Fiber optic cables are also commonly placed in places such as sewers where large rodents are found. For this purpose, special reinforced fibre optic cables are used, which are not easily chewed through. The only problem is that they are a lot heavier than the regular ones.

But as you can see in the next photo, we did it, even if it was a close call 🙂


Reinforced fiber optic cable.

The reinforced fiber optic cable has been welded into the territory of the marten family and so far is holding out.

Note: The Kun family did not compromise connectivity to our datacenter. That’s where all the fiber optic cable protectors are buried deep. This was a secondary route that we use for other purposes (connecting a training site and connecting some company associates).

Note 2:
Our fibre optic routes for production are currently 3 x 100 Gbps and currently terminate in Datacentre 1, which is on the CETIN fibre optic backbone. Each route leads to the building in a different way and from a different side. 2 routes are operated by CETIN (former Telefonica O2) and 1 route via ČD Telematika. We have it that way on purpose, so that we are not dependent on one supplier. Each route takes a different route (one via Písek and Pilsen, the second via Tábor and the third via Jindřichův Hradec and Havlíčkův Brod). Mom did it on purpose, too. Routes lead from 2 different routers from Hluboká nad Vltavou, which we also have on purpose. And they lead to Prague to two different locations where they are connected to 3 (soon 4) different connectivity providers. We got that on purpose too 🙂 . Certainty is certainty.

To the second datacentre there will be 1 route from ČD Telematika and then 2 connections from Datacentre 1. One link over the hill (and the castle) in Hluboká nad Vltavou and the other link around the hill. The routes to the building are each from a different side and are without a single concurrent. Certainty is certainty.