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Limitations of intra datacentre communications exploiting optical PCIe interconnections

机译:利用光学PCIe互连的内部数据中心通信的局限性

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摘要

To support the huge intra-datacentre traffic growth, network architectures based on Peripheral Component Interconnect Express (PCIe) communication protocol have been proposed in alternative to Ethernet ones. To cover the entire datacentre area and to promote the recently released PCIe Gen4, operating at 16 Gb/s, the employment of optical fibre communication is mandatory. We demonstrate, by physical layer measurements, the compliance to the PCIe standard in terms of eye diagram mask and jitter for both Gen3 and Gen4 optical PCIe links, considering up to 10-km standard single mode fibre (SMF) propagation and transmission in the second window of optical communications. On the other hand, we perform an analysis to evidence that the maximum fibre reach is limited by the propagation latency due to the PCIe protocol ACK/NACK operation. For 1-lane PCIe Gen3 link we experimentally verify, through a protocol analysis, the reach limits expected by our evaluation; moreover, for longer distances, we detect retransmissions which reduce the actual transmitted capacity, without error introduction.
机译:为了支持巨大的数据中心内部流量增长,已经提出了基于外围组件互连快速(PCIe)通信协议的网络体系结构,以替代以太网。为了覆盖整个数据中心区域并推广最近发布的以16 Gb / s速度运行的PCIe Gen4,必须使用光纤通信。我们通过物理层测量证明了Gen3和Gen4光学PCIe链路的眼图模板和抖动方面都符合PCIe标准,并在第二秒考虑了长达10 km的标准单模光纤(SMF)传播和传输。光通信窗口。另一方面,我们进行分析以证明最大光纤距离受PCIe协议ACK / NACK操作的传播延迟的限制。对于1通道PCIe Gen3链路,我们通过协议分析实验性地验证了评估所期望的范围;此外,对于更长的距离,我们检测到重传会减少实际的传输容量,而不会引入错误。

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