用电话网实现远程监控自动化

分析了偏僻高山上通信机房和电气房要进行监控的内容和特点等，探讨 了用经济、可靠的电话交换网实现远程监控自动化的方案和实施办法。该设计根据监控对象 的特点，利用现有的电话网络和程控交换机实现远程监控，不需要专用通信传输通道，不需 要增加硬件和软件，成本低，技术成熟，容易实现。     

Web方式用户交换机控制台

为了适应用户交换机控制台功能的不断增加和提高控制台软件的可维护性,用C++和Java技术成功地开发了Web方式(BS方式)用户交换机控制台。文章描述了Web方式用户交换机控制台的实现方案和关键技术。     

智能大厦的通信自动化网络系统

章乎先对智能大厦通信自动化交换网络的组成作了论述;然后主要介绍了ＡＴＭ网络系统的相关技术及其应用。     

Design of a multimicroprocessor-controlled PABX: Continuing decreases in component costs mean that systems such as telephone branch exchanges can handle large data traffic relatively cheaply.

Problems encountered in the design of a multimicroprocessor-controlled private automatic branch exchange (PABX) using space division analogue switching concepts are discussed. The design organization includes pairs of groups of subscribers. Each group is controlled by a microprocessor with a private memory; the system also includes a common memory accessible by all the microprocessors. The maximum number of subscribers is 256 in each pair of groups; this is governed by the 8-bit word length of the microprocessors used. If the word length of the processor is doubled, the maximum number may reach 6000 subscribers per pair of groups; this is limited by the available addressing space because memory-mapped I/O control is used. A further increase in the number of subscribers per pair of groups may be achieved if memory space is not an obstacle, since the processor speed does not pose any limitation on the organization used for up to 110 000 subscribers per pair of groups. Expansion of such an organization scheme by adding more group pairs is possible; however, this makes hardware interfacing in the system slightly more complex.A complete design for a pair of groups controlled by two microprocessors and servicing 256 subscribers is described. The implementation of this design in the laboratory is discussed. The main requirements of multiprocessing were applied to the proposed PABX with regard to the logic, software and hardware design. The design of all the microprocessor circuits is given. All external circuits responsible for counting and storing dialled digits, generating telephone tones and interfacing are described in detail. The main programs and accompanying subroutines are discussed and their flowcharts are given. The complete design provided a satisfactory telephone service when realized in the laboratory. Finally, the advantages and disadvantages of the system are discussed.     

电力线载波机与程控交换机的连接

以ZDD－12A电力线载波机为例,介绍两种可实行双向自动交换的电力线载波机与程控交换连接方法。方法简单、易行，因而具有推广、使用价值。     

综合业务光纤DQDB网PABX互连研究

ＤＱＤＢ网具有吞吐量大、网络的可靠性高、抗毁性等优点，它采用电路交换和分组交换相结合的混合交换方式，提供综合业务。文章在对综合业务光纤ＤＱＤＢ网分析的基础 ，重点研究了提供话音业务的ＰＡＢＸ互连问题。     

程控交换机远程维护和记费管理

本文介绍了一种实用的程控交换机远程维护和管理系统，给出了实现该系统的原理框图，并详细介绍了各部分的作用和具体实现技术。     

白山发电厂综合业务数字网

根据电力系统的通信专用网的特点,利用光缆和微波传输方式,将梯级发电站群的交换机实现数字联网,并进行综合业务的实验及应用,以提高电力系统通信的自动化水平。     

Information technology at the National Computing Centre

An outline is given of the information services used in the National Computing Centre. An update is provided of a previous paper describing the local area network implemented in 1981. Three IT landmarks are highlighted, these include the introduction of word processing, the local area network and a digital PABX. The implications and subsequent developments are described. The facilities available on the local area network are discussed. The use of three electronic mail services are also considered, along with the use of facsimile.     

Integrated office communications

The office of the future will not be fully realised until all the functions required by users are integrated into one office system. The article proposes that this integration should be based on the integrated services local network. It discusses the reasons for integration, the technology behind integration, local area networks and teletex. It also examines the need for high-speed external communications, and how the ISLN could be the basis for a totally integrated office of the future.