Abstract
The networking infrastructure of the KM3NeT detector, implemented with both White Rabbit and standard high preformance switches, is presented in its peculiar asymmetric and hybrid layout. It is one of the first usecases for Software Defined Networking in Astroparticle Physics experiments. Thanks to this innovative technology, dangerous network loops are prevented and a complete deterministic control of the handled data flows is obtained.
Highlights
KM3NeT is a distributed neutrino observatory in abyssal sites of the Mediterranean Sea [1]
Each installation will be based on a grid of thousands Digital Optical Modules (DOMs), interconnected to shore via an electro-optical seafloor infrastructure extended over distances of O(100) km
We focus here on the RAW LAN, which is the Layer 2 segment that interconnects the off-shore detector to the Control Unit (CU) and Trigger and Data Acquisition System (TriDAS) servers, on-shore
Summary
KM3NeT is a distributed neutrino observatory in abyssal sites of the Mediterranean Sea [1]. We focus here on the RAW LAN, which is the Layer 2 segment that interconnects the off-shore detector to the Control Unit (CU) and Trigger and Data Acquisition System (TriDAS) servers, on-shore. As anticipated, it has to comply with the two following important constraints: Asymmetry of the connections: the asymmetry directly originates after the so-called optical broadcast architecture adopted for the optical infrstructure. Experience demonstrated that to preserve the stability of the WR infrastructure, and grant a reliable time-synchronisation mechanism, it is mandatory to minimise the traffic passing through the WRS-Broadcast This is achieved with the Software Defined Networking (SDN), a frontier technology applicable by modern high-level switches. A group of ports of a switch driven via SDN is called SDN instance
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