Accurate clock and time distribution is a key requirement for self-triggered streaming data acquisition in the CBM experiment. This distribution is handled by the Timing and Fast Control (TFC) system by clock forwarding and broadcasting the common time over latency-deterministic optical links in a hierarchical FPGA network. The point-to-point optical connections are served by the latency-optimized GBT-FPGA core, which has been developed at CERN. In the presented work, the performance of GBT-FPGA links for time and clock distribution in a scaled TFC system with multiple hops and endpoints has been investigated.

中文翻译：

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具有确定性光链路的分层时间和时钟分配网络中的时间误差累积

准确的时钟和时间分布是煤层气实验中自触发流数据采集的关键要求。这种分配由定时和快速控制 (TFC) 系统处理，通过分层 FPGA 网络中的延迟确定性光学链路进行时钟转发和广播公共时间。点对点光学连接由 CERN 开发的延迟优化 GBT-FPGA 内核提供服务。在所提出的工作中，研究了具有多跳和端点的可扩展 TFC 系统中用于时间和时钟分配的 GBT-FPGA 链路的性能。