Universität Bonn

University IT and Data Center

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We operate the central network of the University of Bonn.
We, the HRZ: traditionally modern
We are the contact point for all questions, ideas and projects concerning the central IT services of the University of Bonn. 
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Our WIFI never sleeps
We, the HRZ: traditionally modern
Is your mobile already connected to the Wi-Fi?

University IT and Data Center

The University IT and Data Center (Hochschulrechenzentrum, HRZ) is the central IT service provider of the University of Bonn

BONNET construction work at the cable route to Endenich

Upcoming Demolition work at the junction of the B56 and the BAB 565 (Endenicher Ei) by Autobahn GmbH made it necessary to relocate the university's cable routes in the immediate construction area at short notice. This affected several fiber optic cables between Poppelsdorf and Endenich, which form one of the main connections on the core network of the university network (BONNET). For the relocation, it was necessary to cut the existing cables (which consist of a total of around 350 optical fibers) in front of and behind the construction area and to re-route them via an alternative cable route, which was created together with Autobahn GmbH, and to reconnect them using so-called splice sleeves.

Autobahn GmbH specified a non-postponable time window from February 9 to February 23, 2024 for the relocation. Autobahn GmbH carried out preparatory construction work until February 9, 2024, and from February 23, 2024, the closure of the BAB 565 and subsequent demolition work on the "Endenicher Ei" bridge structure was scheduled. The challenge now was to organize and accommodate the extensive preparations, appointments with suitable service providers and the necessary material deliveries within the specified time frame.

Crucial data connections to Endenich were already and are still secured through path-redundant lines through the main building and the Römerstraße to Endenich.Non-redundant connections were switched to replacement lines via other cable routes as far as possible in order to keep outages in BONNET to a minimum. For a few connections, such as the fiber optic connection to the Klein-Altendorf campus, temporary interim solutions via other routes could not be made possible, so that an outage of one to two days had to be expected here. As part of the preparations, suitable points also had to be found for cutting the connection. The route shafts directly in front of and behind the construction area were not very suitable due to poor accessibility, which is also important for future work. In addition to good accessibility, the shafts must offer sufficient space to accommodate the splice sleeves and future extensions. Once suitable shafts had been found, route tests had to be carried out to ensure that the replacement cables could also be pulled through the routes to these shafts. The decision was also made in advance to pull so-called "speed pipes" into the routes instead of individual cables. These are thin empty conduits into which fiber optic bundles can later be blown over longer distances.  In the case of upgrades, this has the advantage that cables which are organised in distances  of 100 m, do not have to be lined in each shaft. This would always cause disturbances in public areas, which is why all attempts are made to avoid this. Blowing the optical fibers into existing speed pipes can be done over significantly longer distances, without having to open the shafts between the two ends of the route, which facilitates future works and upgrades at the connection to Endenich.

As part of the preparations, the distribution of the occupied and still free optical fibres across the various fibre bundles of the cable made it possible to carry out the splitting and re-splicing successively (12 fibres per fibre bundle). Compared to the logistically much simpler splitting and rerouting of the entire cable in one step, the successive splicing and in particular the simultaneous deployment of two splicing teams at both ends of the rerouting resulted in significantly minimised downtimes in BONNET.

On Friday, 16.02.2024 at 13:55, the time had come: the connection to the Klein-Altendorf campus was started and, thanks to the optimisation of the process, the changeover was completed in less than 15 minutes. The majority of critical fibres were then relocated on Saturday, 17.02.2024 between 07:00 and 15:00. Other, less critical fibres were relocated between 19 and 20.02.2024. As far as it could be integrated into the workflow, the necessary continuity measurements of the optical fibres were integrated into the splicing work, with a particular focus on the critical connections. Further measurements and the necessary follow-up work were then carried out over the following three weeks.

Introduction of JupyterHub

The University Computer Centre is now supporting the use of the multi-user data science platform JupyterHub, which allows users to work in their own interactive environment directly in the browser.

JupyterHub allows its users to use many programming languages (like Python, R und Julia)  in so-called Jupyter notebooks. Jupyter notebooks are standardised files that enable the creation, management and sharing of program codes.

This enables e.g. teachers, to provide their participants with a standardised but customisable learning environment via eCampus, without having to install software on the end devices first.
JupyterHub users automatically receive 5GB of storage space for their personal Jupyter server. Specifications such as CPU or RAM limits can also be set individually for course participants.

HPC-Cluster Marvin resumes testing mode

"Marvin", the supercomputer installed at the University of Bonn in 2023, is about to be released. The cluster, consisting of 192 MPP nodes with a total of 18400 computing cores and an additional 300 NVIDIA GPUs, which was unveiled to the public in a festive inauguration event on 20 October 2023, is now about to be released.

After technical difficulties during the cooling of the cluster, the first testing phase had to be interrupted from the beginning of December until mid-February. During these two months, intensive work was carried out to make the cooling system more reliable and to protect the cluster hardware and the running jobs in the event of incidents.

The operations team at the University Computing Centre is now pleased to announce that the additional security mechanisms have been successfully tested, meaning that the HPC cluster could be put back into operation on Tuesday, 13 February 2024. This marks the start of the second intensive test phase, in which highly experienced "power users" can use the cluster again for numerical simulations and at the same time report possible problems and hickups to the data centre's maintenance team.

This also means that the supercomputer nears its official release to the general user base: Registration for the use of the HPC cluster is expected to be open to all scientists at the University of Bonn and its cooperation partners from 11 March 2024.

IT classes in the summer term 2024

In the HRZ's own course room and online, courses on many IT topics will be offered to all university members also in summer term 2024. 

Eine Wissenschaftlerin und ein Wissenschaftler arbeiten hinter einer Glasfassade und mischen Chemikalien mit Großgeräten.
© Universität Bonn

Help and Services

The University IT and Data Center offers a variety of services and provides support for them. You can find all services here:

System Status and Maintenance

The status of all systems of the University IT and Data Center, maintenance messages and current faults are available on a separate status overview at StatusPage.


All information about the Uni-ID. This is your access to the university's central IT services.


How do I access the internet and the university network on campus with my laptop, mobile phone and co?


With Confluence, you get a modern tool for your internal communication and collaboration.

Data Storage

You have research data on a large scale?
We have the infrastructure to securely store your data and continue working with it.

Offers and projects at the HRZ


We train! Information about the apprenticeship as IT specialist


We offer a wide range of career opportunities in science and technology.


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About Us

We are happy to explain who we are, what makes us tick and what we are working on. 



The IT - Helpdesk is staffed from 8 am to 6 pm and will be happy to help you with your questions.


+49 (0)228 73 2751



Wegelerstraße 6

53115 Bonn

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