By Z. L. Budrikis, A. Cantoni, J. L. Hullett (auth.), Otto Spaniol, André Danthine, Wolfgang Effelsberg (eds.)
Multimedia facts streams will shape an important a part of the hot new release of purposes in high-speed networks. non-stop media streams, although, require transmission with assured functionality. furthermore, many multimedia functions would require peer-to-multipeer conversation. assured functionality can basically be supplied with source reservation within the community, and effective multipeer conversation has to be according to multicast help within the decrease layers of the community.
Architecture and Protocols for High-Speed Networks specializes in innovations for construction the networks that may meet the desires of those multimedia purposes. specifically components of present learn curiosity in such communique structures are coated extensive. those are the protocol comparable facets, reminiscent of switched networks, ATM, MAC layer, community and shipping layer; and the providers and functions.
Architecture and Protocols for High-Speed Networks comprises contributions from prime global specialists, giving the main up to date learn to be had. it really is an important reference for all pros, engineers and researchers operating within the quarter of high-speed networks.
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Extra info for Architecture and Protocols for High-Speed Networks
BAF-NT ,. _..... -----_ ---- _--------_----... _-----------· ·--- .. -- ........ -- ...... . LEX BAF-LT ... -_ ... __ ..................... _..... _-_ .. . 08 Mbit/s • Round-trip propagation delay: 100jLs (assuming a maximum distance of 10km) 3 THE MAC PROTOCOL Since the MAC protocol has centralized control located in the LT, there has to be a means for information exchange between the NTIs and the LT. To achieve this information exchange, a request/permit mechanism is used. The NTIs declare their bandwidth needs by means of requests.
40 CHAPTER 3 Downstream Information Structure Figure 2b shows the structure of the downstream information flow. A slot has a length of 448 bits and consists of a physical layer preamble of 16 bits, a (CL) bit indicating whether the permit that is added refers to a permit for an ATM cell (CL=O) or a permit for a request block (CL=I), the permit (7 bits being the address of the NTI which is allowed to send a cell (if CL=O) or being the address of the first NTI in a series of 9 consecutive NTIs, which are allowed to send a request in order to form a request block) and finally the downstream ATM cell (424 bits).
2 CHAPTER 2 Non Saturated Traffic Scenarios The assumption of saturated load conditions in local communication systems is unrealistic. Therefore, we present results which have been obtained in variably loaded scenarios. In figure 10 user throughput provided by ATMR, CRMA-II, and MetaRing is shown for different values of the locality parameter p versus the generated load. It should be noted that the presented results are close to results which have been obtained for values of p up to 0,8. The results show that under low and medium load conditions all protocols are able to handle the offered load.