A time-division-multiplexed (TDM) passive optical network (PON) that behaves like multiple point-to-point (P2P) links can support applications with stringent timing requirements while also maintaining the cost benefits of the point-to-multipoint (P2MP) topology. This requires the TDM-PON to provide deterministic performance: lossless transmission and low and constant (with low variations/jitter) latency to selected flows, while also serving other, e.g., best-effort, traffic flows. We demonstrate two approaches for providing deterministic performance over a TDM-PON. In the first approach, we operate the PON asynchronously to its clients and use scheduling that provides upstream bursts at a low and constant period. Jitter compensator gateways (JC GWs) are used to compensate for the jitter introduced by the non-matching PON bursts and the input traffic cycles. In the latter approach, we implement a deterministic dynamic bandwidth allocation (detDBA) process that controls the placement of bursts at each PON frame for selected transmission containers (T-CONTs) that correspond to flows with given traffic profiles. We synchronize and co-schedule the PON with the rest of the network and applications to provide deterministic performance to those flows. As a use case, we study the communication of industrial applications over the deterministic PON system and demonstrate latency below 100 µs and sub-µs packet latency jitter for the industrial flows, while at the same time serving best-effort traffic flows.

中文翻译：

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确定性无源光网络

时分复用 (TDM) 无源光网络 (PON) 的行为类似于多个点对点 (P2P) 链路，可以支持具有严格时序要求的应用，同时还保持点对多点 (P2MP) 的成本优势）拓扑。这要求TDM-PON提供确定性的性能：无损传输以及对选定流的低且恒定（具有低变化/抖动）延迟，同时还服务于其他（例如，尽力而为）业务流。我们演示了两种通过 TDM-PON 提供确定性性能的方法。在第一种方法中，我们对其客户端异步操作 PON，并使用以较低且恒定的周期提供上行突发的调度。抖动补偿器网关 (JC GW) 用于补偿由不匹配的 PON 突发和输入流量周期引入的抖动。在后一种方法中，我们实现了确定性动态带宽分配 (detDBA) 过程，该过程控制每个 PON 帧上选定传输容器 (T-CONT) 的突发位置，这些传输容器对应于具有给定流量配置文件的流。我们将 PON 与网络和应用程序的其余部分进行同步和共同调度，以便为这些流提供确定性的性能。作为一个用例，我们研究了确定性 PON 系统上的工业应用通信，并展示了工业流低于 100 µs 的延迟和亚 µs 数据包延迟抖动，同时服务于尽力而为的流量流。