Common channel signaling in the AT&T US 5ESS switch

A brief history of the evolution that has led to the development of Signaling System No.7 (SS7) capabilities on the 5ESS switch is presented, and the hardware and software components that provide the SS7 functionality for the 5ESS switch are described. Specifically, the functionality provided by the Common Network Interface (CNI) ring, which has been used on several AT&T SS7 products is discussed. The 5ESS switch-specific common channel signaling (CCS) transport software (which is responsible for the transport of SS7 messages among 5ESS switch processing elements), the user interfaces (which provide customer administration of switch data, color display of status information, reports on the state of the SS7 network, and the tests to verify message routing through the network), and message routing itself are discussed. The SS7 ISDN user part (ISUP) and transaction capabilities application (TCAP) functionalities implemented in 5ESS switch software are described in terms of how they fit into the 5ESS switch architecture. SS7 call handling capacities and the ways in which reliability challenges are met are described     

US telecommunications policy: directions for the next five years

The author highlights the intricacy and the importance of US telecommunications policy. He describes the telecommunications infrastructure, and discusses regulatory issues. He examines the impact of public policy on foreign trade     

Breakup of AT&T and liberalization of the telecommunicationsbusiness

The author argues that the present status and future direction of liberalization of the telecommunications business in the wake of the breakup of AT&T must be considered from two viewpoints. One viewpoint approaches the telecommunications business as a public business; the other approaches it as a means to promote, in various countries, advancement and diversification of universal telecommunications. In this context he evaluates the impact of the breakup on communication policy worldwide     

US domestic telecommunications policy in the next five years

The author examines the impact of changing technology and the changing marketplace on the telecommunications industry. He points out that telecommunications policy must permit the industry to respond quickly to these changes. He sets forth what he believes are the principles that govern this policy area and gives some examples of their applications     

The AT&T satellite network control system

The network control systems used by AT&T Business Communications Services and by AT&T International Communications Services are discussed. From the inception of its satellite services, AT&T has supported the concept of centralized monitoring and control (M and C) of its widely dispersed earth stations. Today, the M and C is being handled by the MONARC (monitor and remote controller) in the earth stations, and GSNCS (generic satellite network control system) in the AT&T domestic and international operations centers. The MONARC software allows flexible interface to any equipment; GSNCS provides graphically presented M and C of all earth stations from one central location via voice-grade data lines. By MONARC/GSNCS monitoring the earth stations on a 24-hour basis and being able to initiate event-driven or time-driven operations in response to earth station conditions, AT&T is able to maintain the highest possible network readiness     

Optical architecture and interface lightguide unit forfiber-to-the-home feature of the AT&T SLC Series 5 carrier system

The subscriber loop has evolved from analog transmission on passive copper through digital carrier on copper to initial applications of fiber to customer premises. In planning its initial deployment of fiber to customer premises, AT&T analyzed a variety of optical devices and transmission techniques. It was decided to employ 1300-nm laser-based baseband duplex transmission employing fused fiber splitter devices. An optical interface lightguide unit was designed to house the optical components and protect them during assembly to a transceiver circuit board. This unit has proved compatible with a mass production factory environment. The optical transceivers have been deployed to sites throughout the US and have been performing reliably since the fall of 1988. The author discusses the choice of media, source, and wavelength; the lightguide unit; and the system characteristics     

Lasers--Their development and applications at AT&T Bell Laboratories

AT&T Bell Laboratories has played a crucial role in the invention and further development of lasers. In this paper I give a semihistorical account of the key contributions made by Bell Labs scientists. These contributions include the invention of the laser, optical resonator theory, the helium-neon and other atomic gas lasers, the carbon dioxide and other molecular lasers, solid state lasers, dye lasers, semiconductor lasers, ultrashort pulse mode locked lasers, color center lasers, tunable spin flip Raman lasers, and applications such as two photon absorption, nonlinear optics, etc. This review is by no means all encompassing since even just the listing of only the titles of all the publications in the field of quantum electronics by Bell Labs scientists would more than fill this entire issue ofJ-QE.     

Transition to the AT&T-IS Integrated Private Network Architecture

Private corporate networks are evolving toward all-digital networks that combine voice and data transmission on a single network. The functional and economic advantages of those networks over their analog antecendents motivate this evolution. This paper describes AT&T Information Systems integrated private network architecture and its functional and economic advantages.     

Assessment of radiation-induced loss for AT&T fiber-optictransmission systems in the terrestrial environment

Environmental radiation dose rate estimates are provided for both outdoor terrestrial and indoor environments. Laboratory radiation sensitivity measurements are reported for the AT&T standard single-mode fiber and standard and radiation-hardened multimode fibers. These are used to estimate typical system losses for long-haul, trunk, feeder, local area network, and optical data environments. It is reported that radiation-induced loss is unusually harsh environments can be minimized by using the radiation hardened 62.5/125-μm multimode fiber, which has sensitivities roughly an order of magnitude lower than the standard product at 0.85 μm and almost two orders of magnitude lower at 1.3 μm     

Whither speech recognition: the next 25 years

The fundamentals of speech recognition are reviewed. The dimensions of the speech recognition task, speech feature analysis, pattern classification using hidden Markov models, language processing, and the current accuracy of speech recognition systems are discussed. The applications of speech recognition in telecommunications, voice dictation, speech understanding for data retrieval, and consumer products are examined     

巩固成果开创未来--安徽省无线电管理工作"十五"回顾及"十一五"展望

2005年及“十五”期间，安徽省无线电管理事业在省政府和国家无线电办公室的领导和指导下，认真贯彻执行国家无线电管理法规和方针政策，按照“十五”规划确定的目标任务，围绕管好频谱资源、管好无线电台站、管好电波秩序的要求，积极履行职责，在频率台站管理、依法行政、基础技术设施建设、维护空中电波秩序和管理机构组织能力建设等方面取得显著成绩，为促进社会经济建设和发展作出了积极的贡献。本文介绍了安徽省无线电管理工作中的经验，希望给读者以启迪。[编者按]     

Strategic technology for the next ten years and beyond

It is asserted that because of the pace and the thoroughness of the changes taking place in telecommunications, it is necessary to take technological development even more seriously and pursue it more vigorously. The role of Bellcore in this endeavor is discussed