从2000年3月起,日本电报电话公司(NTT)下属的Do Co Mo公司开始推出'卫星报文分组(Packet)通信业务',该项业务利用了2个同步轨道的通信卫星,业务区域为日本本土及其沿岸200 n mile,无论什么时候、无论在什么地方都能方便地利用...从2000年3月起,日本电报电话公司(NTT)下属的Do Co Mo公司开始推出'卫星报文分组(Packet)通信业务',该项业务利用了2个同步轨道的通信卫星,业务区域为日本本土及其沿岸200 n mile,无论什么时候、无论在什么地方都能方便地利用因特网。最近几年,即使在船舶通信等业务中,利用因特网和企业内部网(Intranet)的需求也在迅速地增加。卫星报文分组通信业务是新的数据通信业务,它通过向船舶提供与岸上相同的信息通信环境来实现航海的多媒体时代。展开更多
Shared Memory (SM) switches are widely used for its high throughput, low delay and efficient use of memory. This paper compares the performance of two prominent switching schemes of SM packet switches: Cell-Based Swit...Shared Memory (SM) switches are widely used for its high throughput, low delay and efficient use of memory. This paper compares the performance of two prominent switching schemes of SM packet switches: Cell-Based Switching (CBS) and Packet-Based Switching (PBS).Theoretical analysis is carried out to draw qualitative conclusion on the memory requirement,throughput and packet delay of the two schemes. Furthermore, simulations are carried out to get quantitative results of the performance comparison under various system load, traffic patterns,and memory sizes. Simulation results show that PBS has the advantage of shorter time delay while CBS has lower memory requirement and outperforms in throughput when the memory size is limited. The comparison can be used for tradeoff between performance and complexity in switch design.展开更多
文摘从2000年3月起,日本电报电话公司(NTT)下属的Do Co Mo公司开始推出'卫星报文分组(Packet)通信业务',该项业务利用了2个同步轨道的通信卫星,业务区域为日本本土及其沿岸200 n mile,无论什么时候、无论在什么地方都能方便地利用因特网。最近几年,即使在船舶通信等业务中,利用因特网和企业内部网(Intranet)的需求也在迅速地增加。卫星报文分组通信业务是新的数据通信业务,它通过向船舶提供与岸上相同的信息通信环境来实现航海的多媒体时代。
基金国家自然科学基金(the National Natural Science Foundation of China under Grant No.10471152)湖南省自然科学基金(the NaturalScience Foundation of Hunan Province of China under Grant No.02JJY2094)
基金Supported by the National Natural Science Foundation of China(No.69896242).
文摘Shared Memory (SM) switches are widely used for its high throughput, low delay and efficient use of memory. This paper compares the performance of two prominent switching schemes of SM packet switches: Cell-Based Switching (CBS) and Packet-Based Switching (PBS).Theoretical analysis is carried out to draw qualitative conclusion on the memory requirement,throughput and packet delay of the two schemes. Furthermore, simulations are carried out to get quantitative results of the performance comparison under various system load, traffic patterns,and memory sizes. Simulation results show that PBS has the advantage of shorter time delay while CBS has lower memory requirement and outperforms in throughput when the memory size is limited. The comparison can be used for tradeoff between performance and complexity in switch design.
