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Switching Theory: Architecture and Performance in Broadband ATM Networks phần 6

Mạng lưới với Unbuffered Planes chuyển mạch song song Trong phần trước, nó đã được hiển thị như thế nào thêm một khả năng xếp hàng để mỗi SE của một mạng lưới đa, hiệu suất điển hình của một chuyển mạch ATM có thể được dễ dàng có được. | 204 ATM Switching with Minimum-Depth Blocking Networks 6.3. Networks with Unbuffered Parallel Switching Planes In the previous section it has been shown how adding a queueing capability to each SE of a banyan network the performance typical of an ATM switch can be easily obtained. An alternative approach for improving the traffic performance of a basic banyan network consists in using unbuffered parallel planes coupled with external queueing. The adoption of multiple unbuffered parallel switching planes implies that output queueing is mandatory in order to control the packet loss performance. In fact more than one cell per slot can be received at each network output interface but just one cell per slot can be transmitted downstream by the switch. In this section we will examine how output queueing alone or combined with input queueing can be adopted in a buffered replicated banyan network BRBN in which different arrangements and operations of the banyan networks are considered. 6.3.1. Basic architectures The general architecture of a buffered replicated banyan network is represented by the general scheme of Figure 6.4 in which each splitter is preceded by a buffer the input queue and each combiner is replaced by a buffer the output queue . Note that at most one read and one write operation per slot are required in each input queue whereas multiple writes up to K occur at each output queue. The output interconnection pattern is always a shuffle pattern that guarantees full accessibility of each banyan network to all the output buffers. The input interconnection pattern together with the operation mode of the splitters determines the managing technique of the K banyan networks in the BRBN structure that is the way of distributing the packet received at the switch inlets to the K banyan networks. Analogously to the operation in the unbuffered RBN three basic modes of packet distribution techniques can be defined in which all of them guarantee now full accessibility to