本文介绍了典型的宽带城域网组网技术,包括千兆以太网(GE)技术、POS(Packet over SDH)技术、以SDH为基础的多业务传送平台(MSTP)技术、ATM技术以及弹性分组环(RPR)技术,对它们的特点、优缺点和适用范围进行逐一分析,并给出了宽带城域网...本文介绍了典型的宽带城域网组网技术,包括千兆以太网(GE)技术、POS(Packet over SDH)技术、以SDH为基础的多业务传送平台(MSTP)技术、ATM技术以及弹性分组环(RPR)技术,对它们的特点、优缺点和适用范围进行逐一分析,并给出了宽带城域网的设计原则。展开更多
为提高基于星上ATM(asynchronous transfer mode)交换的宽带卫星通信网络的星上缓存资源的利用率,针对非实时数据业务,提出了一种跨层星上缓存管理策略——错误信元尾丢弃ECTD(erroneouscell tail drop)。该策略把由信道引起的错误信元...为提高基于星上ATM(asynchronous transfer mode)交换的宽带卫星通信网络的星上缓存资源的利用率,针对非实时数据业务,提出了一种跨层星上缓存管理策略——错误信元尾丢弃ECTD(erroneouscell tail drop)。该策略把由信道引起的错误信元及后续的属于同一协议数据单元的无效信元丢弃。基于系统仿真,采用Goodput和有效吞吐量两种性能评估指标分析了ECTD的性能。结果表明,ECTD提高了星上交换机的业务传递效率以及下行链路的利用率,其对有效吞吐量性能的提高大于Goodput性能的提高。展开更多
Available Bit Rate (ABR) service has been developed to support data applications to asynchronous transfer mode (ATM) networks.Since a ratebased feedback flow control mechanism has been selected as a standard by ATM Fo...Available Bit Rate (ABR) service has been developed to support data applications to asynchronous transfer mode (ATM) networks.Since a ratebased feedback flow control mechanism has been selected as a standard by ATM Forum,buffering becomes an issue that needs intensive study.In this paper,the queuing performance in a switch is studied in detail.It is theoretically proven that the goals of no cell loss and full utilization of link capacity can be achieved by choosing an appropriate buffersize and threshold of the switch buffer which is supported by our simulation results of a complex network.展开更多
文摘为提高基于星上ATM(asynchronous transfer mode)交换的宽带卫星通信网络的星上缓存资源的利用率,针对非实时数据业务,提出了一种跨层星上缓存管理策略——错误信元尾丢弃ECTD(erroneouscell tail drop)。该策略把由信道引起的错误信元及后续的属于同一协议数据单元的无效信元丢弃。基于系统仿真,采用Goodput和有效吞吐量两种性能评估指标分析了ECTD的性能。结果表明,ECTD提高了星上交换机的业务传递效率以及下行链路的利用率,其对有效吞吐量性能的提高大于Goodput性能的提高。
文摘Available Bit Rate (ABR) service has been developed to support data applications to asynchronous transfer mode (ATM) networks.Since a ratebased feedback flow control mechanism has been selected as a standard by ATM Forum,buffering becomes an issue that needs intensive study.In this paper,the queuing performance in a switch is studied in detail.It is theoretically proven that the goals of no cell loss and full utilization of link capacity can be achieved by choosing an appropriate buffersize and threshold of the switch buffer which is supported by our simulation results of a complex network.
