A Scalable Communication Integrated Optical Network (SCION) for Bandwidth Greedy Multimedia Applications

该提案介绍了一种用于可扩展集成光网络的原始架构方法，该网络由具有通过网桥互连的不同拓扑结构的“LAN”段组成。研究人员首先研究了两种最有前途的拓扑结构，环形和折叠总线，它们直接通过桥互连。由于在每种情况下同步要求和实现问题不同，因此在互连网络的不同区域中可能优选某些拓扑。 研究人员还建议考虑一个网络主干，作为几十个子网之间的互连结构。 在每个子网（环或总线）中，数据包被单独地插入光纤介质和从光纤介质中提取，而在骨干网中，时隙路由用于在成对的子网之间交换信息。 网桥架构是本提案的主要焦点之一，将对所有主要选项进行研究-无光缓冲网桥、带光缓冲网桥（SDL网桥）以及用于控制网桥操作和争用解决的相关协议，包括时隙覆盖解决方案。 桥接网络节点的节点架构必须考虑：收发器的类型、到网络的光接口以及发送器处的缓冲区组织。发射器和接收器可以是可调谐的或固定的，其中两个设备中的至少一个是可调谐的，以提供节点之间的完全连接。这些节点结构选择将与新协议一起进行研究，以支持处理桥接操作所需的不同“排序算法”，以避免产生电子瓶颈。 时隙路由相关的协议和控制是影响全局网络性能的关键因素。为了在本地和网络间流量之间分配时隙，时隙管理协议是必要的。 将评估两种可能性：固定时隙分配协议， 以由预期业务和网络条件确定的预设顺序分配时隙，以及动态时隙分配协议，其根据每个网段的瞬时提供的负载来分配时隙。 分析模型和模拟工具将被广泛用于评估不同解决方案的性能。

This proposal introduced an original architectural approach for a scalable integrated optical network consisting of "LAN" segments with varying topologies interconnected by bridges. The investigators first investigate the two most promising topologies, rings and folded buses, interconnected directly by a bridge. Since in each case synchronization requirements and implementation issues vary, certain topologies may be preferred in different areas of the interconnected network. The investigators also propose to consider a network backbone that serves as an interconnect structure among dozens of subnetworks. In each subnetwork (rings or buses) packets are individually inserted into and extracted from the fiber medium, while in the backbone slot routing is used to exchange information between pairs of subnetworks. The bridge architecture is one of the main foci of this proposal which will be investigated covering all main options - a bridge without optical buffering, a bridge with optical buffering (SDL-bridge), and associated protocols for controlling the bridge operation and contention resolution, including the slot-override solution. The node architecture of bridged network nodes must take into account: the type of transceiver, the optical interface to the network, and the buffer organization at the transmitter. The transmitters and the receivers can be tunable or fixed, with at least one of the two devices being tunable to provide full connectivity among the nodes. These node architecture options will be investigated together with the new protocols to support different "sorting algorithms" needed to deal with bridge operation to avoid the creation of electronic bottlenecks. The slot routing related protocols and control are a key factor in the global network performance. In order to allocate slots between local and internetwork traffic a slot management protocol is necessary. Two possibilities will be evaluated: a fixed slot allocation protocol, which allocates slots in a preset order, determined by expected traffic and by network conditions, and a dynamic slot allocation protocol, which allocates slots according to the instantaneous offered load of each network segment. Analytical models and simulation tools will be extensively used to assess the performance of the different solutions.