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

该方案为可扩展的集成光网络引入了一种独创的体系结构方法，该网络由由网桥互连的具有不同拓扑的“局域网”段组成。研究人员首先调查了两种最有希望的拓扑结构，环形和折叠公共汽车，它们通过一座桥直接相连。由于在每种情况下同步要求和实现问题各不相同，所以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种网络主干，作为数十个子网络之间的互连结构。在每个子网络(环或总线)中，分组被单独地插入光纤介质和从光纤介质中提取，而在主干时隙中，路由被用来在子网络对之间交换信息。网桥体系结构是该提案的主要焦点之一，将对所有主要选项进行调查--无光缓冲的网桥、带光缓冲的网桥(SDL-网桥)，以及用于控制网桥操作和竞争解决的相关协议，包括时隙覆盖解决方案。桥接网络节点的节点体系结构必须考虑：收发信机的类型、网络的光接口以及发射机处的缓冲区组织。发射机和接收机可以是可调谐的或固定的，其中两个设备中的至少一个可调谐以提供节点之间的完全连接。这些节点架构选项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。为了在本地和网际业务之间分配时隙，时隙管理协议是必需的。将评估两种可能性：固定时隙分配协议和动态时隙分配协议，其中固定时隙分配协议按照由预期业务量和网络条件确定的预设顺序来分配时隙，动态时隙分配协议根据每个网段的瞬时提供的负载来分配时隙。将广泛使用分析模型和模拟工具来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.