交换机选路功能对ISDN网络结构的影响

因为交换机选择路由功能的实现，在一定程度上决定了ＩＳＤＮ的网络结构，因此，在组织ＩＳＤＮ网络的时候，首先要考虑交换机选择路由的能力。     

交换机选路功能对ISDN网络结构的影响

交换机选择路由功能的实现在一定程度上决定了ＩＳＤＮ的网络结构，因此，在组织ＩＳＤＮ网络时，应考虑交换机选择路由的能力。     

南京电信局组建N-ISDN网络的情况介绍

本文从 N- ISDN的组网方式、路由选择等方面 ,介绍了南京电信局组建N- ISDN网络的实际运用。     

DPN—100分组交换机路由选择系统的特点（2）

ＤＰＮ１００分组交换机路由选择系统的特点（２）□李虹２２路由权值（１）最大通过量路由权值和最小延迟路由权值在ＤＰＮ１００网络中，有两种权值（Ｍｅｔｒｉｃ）用于表示跨越网络的路径的特征．第一种是基于最大通过量路由选择，叫作最大通过量路由权值；第二...     

常用路由协议的分析及比较

在计算机网络中，路由协议的选择至关重要，它直接影响到一个网络的性能，而路由协议的选择又相当复杂。本主要介绍几种常用路由协议的工作原理，并对各种协议的特点进行分析，比较、以帮助网络设计工程师在设计网络时，能够正确地选择路由协议。     

北京电信ISDN网络的演进

目前北京电信N－ISDN的发展已初具规模。在各种交换机ISDN功能不断完善的情况下,应考虑优化、调整网络结构及路由结构、并全网统一信令、随着北京新的汇接局的改造及建设,建议组织一个全ISUP的ISDN网络。     

基于增强学习的协作主动路由信息交换机制

分组交换网是当今全球通信基础设施的重要部分，IP网络终将与其他网络相互融合，演化成为新一代网络技术，现有路由协议的实现是单一的，并且将数据库、最优路径计算和网络状态分发机制捆绑在一起。主动路由选择是一个把上述困难作为目标的新路由选择策略。主动路由选择机制被设计用来提供基于用户服务模式的路由选择。本文提出了一种基于增强学习的协作主动路由信息交换机制，主动路由代理获悉网络基础结构不同属性的当前状态，并在这个基础上建立和维护路由表，实现主动路由选择机制。     

新一代网络主动路由选择机制

分组交换网是当今全球通信基础设施的重要部分，IP网络终将与其他网络相互融合，演化成为新一代网络技术。现有路由协议的实现是单一的，并且将数据库、最优路径计算和网络状态分发机制捆绑在一起。主动路由选择是一个把上述困难作为目标的新路由选择策略。本文提出一个新一代网络主动路由选择机制，能够克服传统路由选择机制的局限性，支持多种网络技术。     

本地ISDN的组网方案

本文主要就ISDN交换网的组网进行了简要说明，并对各种呼叫情况的路由选择进行了描述。     

网络路由技术综述

本从路由的概念，网关，路由的有关协议，路由类型，路由表，路由选择算法，路由方式以及路由的设置等方面，详细地介绍了网络路由的有关技术。     

Software Protocol for Handling ISDN in the Packet-Switched Network

The Integrated Services Digital Network (ISDN) provides basic architecture for existing, as well as future residential plus business communications. ISDN overlayed with CCS#7 of a digital PSTN (Public Switched Telephone Network) can be the ultimate, ubiquitous network for circuit switch (voice, data), packet switch (voice, data), and private line (voice, data) applications. Assuming that the present ISDN has to interwork in the present physically separate overlayed networks (voice and data), significant problems are expected to emerge for designing hardware and linking softwares for handling packet traffic. In this paper, the software-related problems, when ISDN packet distribution nodes have to handle an ISDN interface, will be outlined with an ISDN software protocol solution. An approximation of the delay involved in the telephone switching system which is part of ISDN processing as well as the delay for the interface gateways, the HOST computer nodes, and the LAN and WAN computer nodes will be identified and formulated to reflect the total performance measure defined. Major emphasis is given to flow and congestion control performance measures in the ISDN Gateways, which are analyzed and simulated with the assistance of the basic delay table transfer software model developed for the IMPS and gateways in the ARPANET, MILNET, and MINET. The performance evaluation of this basic ISDN interfacing software, which only involved one ISDN level, i.e., the HOST or gateway and its related subnetworks, is simulated on sections of these networks to illustrate its congestion control effectiveness. There are six mathematical software techniques to account for end-to-end delay, which form the basis for the solution to these ISDN software-hardware problems in the Interface Gateways connecting the electronic switch to the computer network components.     

A fast packet switch for the integrated services backbone network

With the projected growth in demand for bandwidth and telecommunication services will come the requirement for a multiservice backbone network of far greater efficiency, capacity, and flexibility than ISDN (integrated-services digital network) is able to satisfy. This class of network has been termed the broadband ISDN, and the design of the switching nodes of such a network is the subject of much research. The author investigates one possible solution. The design and performance, for multiservice traffic, is presented for a fast packet switch based on a nonbuffered, multistage interconnection network. It is shown that for an implementation in current CMOS technology, operating at 50 MHz, switches with a total traffic capacity of up to 150 Gb/s can be constructed. Furthermore, if the reserved service traffic load is limited on each input port to a maximum of 80% of switch port saturation, then a maximum delay across the switch of on the order of 100 μs can be guaranteed, for 99% of the reserved service traffic, regardless of the unreserved service traffic load     

煤矿ISDN中网络节点的DSP实现

针对井下信息传输的特点提出了一种井下ISDN网络模型，介绍了该网络信息传输的过程及包交换协议，并给出了实现信息传输和交换的网络节点的基于DSP的硬件设计和软件编程方案。     

ISDN signal distribution network

The author discusses the ISDN Staged Transport System (STS). The STS illustrates how an ISDN network can be used as a flexible distribution medium for directing real-time signals over a WAN to a staged transport server. Although the signal feeds distributed by the STS application are audio voice grade circuits (VGCs), the architecture lends itself to other signal types, such as video. Moreover, ISDN bridges and routers allow the real-time communications infrastructure to distribute bulk recorded signals as well. Finally, the multimedia wide-area connectivity provided by ISDN allows an entire signal processing operation to be remoted, with receivers, storage, and mission control all managed from a single site (or multiple sites) on the network. While the STS application uses the user to user information element (UU-IE) to control signal processing on the edge of the ISDN network, the UU-IE could just as easily be used on the interior of the network by switch adjuncts to augment dialed number routing with intelligent-application-based routing. When combined with the rich set of commercially available applications available on many ISDN switches and adjuncts, sophisticated signal processing, distribution, and management networks could be rapidly configured and deployed with relative ease     

Bell Canada ISDN Trial Plans

After years of work by the CCITT and other standards bodies, the ISDN concept has reached the stage where manufacturers are announcing the availability of ISDN network and terminal products. Bell Canada has responded to this development by planning an extensive ISDN trial program, including access-loop verification, switch hardware and software verification, and, finally, customer market trials. This trial program will permit Bell Canada to refine the technology and services to best meet customer needs. The trial program is only the most recent manifestation of the evolution towards ISDN through digital network modernization. An early move towards digital technology within Bell has already paid substantial dividends in terms of new services and revenues. These services, and the emerging ISDN-based service opportunities, are highlighted in this paper.     

ISDN terminal portability in the RBOC networks

The differences in the initial ISDN switch implementations by different manufacturers are sufficiently profound that ISDN telephones designed for one switch may not be compatible with other manufacturers' switches. In addition, as new features are added to a given switch, older telephones may not be able to use them. The author examines two solutions to these problems: Bellcore-specified ISDN interfaces and programmable terminals. Bellcore-specified ISDN interfaces are desired by the Regional Bell Operating Companies and support considerable portability. Although conformance to Bellcore specifications will produce a high degree of terminal portability, it is unlikely ever to produce full portability and will not produce any portability in 1990. Programmable terminals are shown to offer interesting potentials for portability and extensibility     

An Improved Immune Genetic Algorithm for Solving the Optimization Problems of Computer Communication Networks

1　IntroductionIndesigningacomputercommunicationnet work ,thenetworkaveragedelayisanimportantpa rameterinthenetworkperformance .Inthispaper,weonlyconsiderM /M/1networks,whichmeansthatthemessageprocessingtimeisaprobabilisticdensityfunctionwithnegativepower,thegroupar rivalandsendingisofPoissiondistributionwithasinglequeue .Supposethatthenetworktopologicalstructureandtheestimatesoftheexternaltrafficrequirementsaregiven ,howtoselecttheoptimalroutestobeusedbythecommunicatingnodesinthenetworksoast…     

Switching System Software Design for ISDN

The ISDN offers various services through multipurpose digital subscriber lines. The switching program for the ISDN should be so designed as to realize the control of various voice and nonvoice services and provide for developing service enhancement. To attain the goal, the ISDN services are classified hierarchically and each category is allocated to appropriate network nodes for implementation. As a result, the local switching program provides an out-slot subscriber line signaling capability and call connection with appropriate compatibility checking including a check for access capability to communications processing nodes. The switching program modules specific to analog services and those specific to digital services are separated to allow the use of the existing program file and to afford easy program design and maintenance. Remote-controlled switching is a suitable means for an economical introduction of the ISDN services to low traffic density areas. Special routing and reliability arrangements as well as the program structure for a remote-controlled switch are discussed.