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|**Time**|**Title**|**Speaker(s)**|
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|14:00 - 14:30|WR status at KM3NeT: current and future developments|Tommaso Chiarusi (INFN), Diego Real (IFIC)|
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|14:30 - 15:00|A 440 km White Rabbit link using DWDM BiDi optics|Ragnar Sundblad (Netnod)|
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|14:30 - 15:00|A 440 km White Rabbit link using DWDM BiDi optics and a method for automated calibration of alpha and delays|Ragnar Sundblad (Netnod)|
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|15:00 - 15:30|WR deployment at LHAASO and other works|Guanghua Gong (Tsinghua University)|
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|15:30 - 15:45|Coffee break||
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|15:45 - 16:15|Porting SPEC drivers to current Linux kernels and embedded ARM boards for WRTD applications|Mathis Marion (INPG), Gwenhael Goavec-Merou (FEMTO-ST), Jean-Michel Friedt (FEMTO-ST)|
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Tommaso Chiarusi's talk: KM3NeT Phase 1 consists of the construction of a limited number of nodes, connected to shore according to a particular design, called “broadcast”. It foresees one single connection line for downward transmissions from the shore station which is then passively split up to all the underwater endpoints. On the contrary, the upstream transmissions are realised via dedicated connections per each node. This contribution aims at discussing the modification done to the WR paradigm in order to accomplish with the highly asymmetric network of KM3NeT Phase 1.
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Diego Real's talk: In addition, the standard White Rabbit protocol is being assessed by the Collaboration for their use in the next phases of the infrastructure. The use of standard White Rabbit implies the installation of a White Rabbit Switch at the bottom of the Detection Units and the modification of the optical and DAQ architecture, being necessary for this purpose the modification of the current White Rabbit Switch electronics and the development of a new back-plane adapted to KM3NeT requirements. The preliminary studies performed to assess the new system and to qualify the use of standard White Rabbit in KM3NeT are presented.
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- **A 440 km White Rabbit link using DWDM BiDi optics**: A 440 km White Rabbit link built using bidirectional transmission with custom DWDM optics, outside of the C-band used by a conventional optical ROADM network, is presented. An automated method for calibrating alpha and latency variations using fiber optic switches is introduced.
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- **A 440 km White Rabbit link using DWDM BiDi optics and a method for automated calibration of alpha and delays**: A 440 km White Rabbit link built using bidirectional transmission with custom DWDM optics, outside of the C-band used by a conventional optical ROADM network, is presented. An automated method for calibrating alpha and latency variations using fiber optic switches is introduced.
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- **WR deployment at LHAASO and other works**: The LHAASO experiment has been fully operational since last June and discovered PeVatrons from our Galaxy. The more than six thousand detector units are synchronized to sub-ns level with the help of WR technology. The deployment of the WR network and some running status will be given in this report.
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- **Porting SPEC drivers to current Linux kernels and embedded ARM boards for WRTD applications**: In the context of distributed multistatic RADAR systems, we are considering using White Rabbit for synchronizing radiofrequency receivers. Starting with an initial demonstration receiving the continuous wave emitted by GRAVES from Eastern France at 143.05 MHz, multiple Ettus Research X310 are synchronized for complementing Doppler target velocity measurement with direction of arrival and hence location of the target. Sub-degree phase resolution along the distributed receiver array requires sub-20 ps phase alignment of the clocks driving the receivers as provided by a White Rabbit Switch associated with each X310. In order to increase the number of receiving sites by decreasing cost, size and consumption, running SPEC boards fitted with analog to digital converters on embedded boards is considered. With the wide availability of the Compute Module 4 OEM version of the Raspberry Pi 4 and its PCIe slot, the White Rabbit Trigger Distribution (WRTD) framework was ported to Buildroot used to cross-compile the embedded image. Doing so required tuning some of the driver functionality to match ARM-architecture requirements in addition to adapting to current Linux kernel API. Thanks to these efforts, runnig WRTD on embedded ARM-based boards is now functional. Perspectives include disciplining the ADC clock on White Rabbit to synchronize data sampling.
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- **The future of White Rabbit**: An open discussion session with the aim of identifying past and current successes and issues and finding the best path forward for the WR community. In particular, we will discuss the latest draft of the [WR Collaboration proposal](https://cernbox.cern.ch/index.php/s/PPUdASzjKyDBVXU) and try to decide if there is enough support to launch the effort in 2022.
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