Public Telecommunications Research Articles

Classification and Assessment of Telecommunication Services in Broad-Band Networks

Communication systems have become a fundamental utility for many facets of private and public life. Increasing system capabilities and advances in technology stimulate expectations of the public for new telecommunication services. Quite a variety of new services have been proposed which will have to be analyzed as to their utility, customer acceptance, and feasibility of implementation. In this paper an analytical approach is selected to assess these services by defining their communication structure and arranging them into classes corresponding to information flow, mode of information exchange, and communication pattern. Services requiring considerable technical expenditures and having a significant impact on future network configurations are pointed out. These services reqmre subscriber-individual and broad-band communication channels. For selected classes of services, a conceptual implementation in three types of networks is presented. It is recommended that several new services be implemented by using facilities of the existing public telecommunication network.

Radio Relay Systems for Public Telecommunication Services in India

Radio Relay Systems for Public Telecommunication Services in India

IEE Scottish Electronics & Control Section: Chairman's address. Public telecommunication in Britain

IEE Scottish Electronics & Control Section: Chairman's address. Public telecommunication in Britain

Transmission performance of telephone networks containing p.c.m. links

Public telecommunication networks are required to transmit various types of information, and any new method of transmission must provide a quality at least as good as the present standards. This paper describes the basis on which the fundamental characteristics were chosen for the new 24-channel short-distance p.c.m. system now being introduced by the British Post Office. Representative overall telephone connections were selected and assessments made of their speech-transmission performance when certain links in them are provided by p.c.m. systems having various sets of fundamental characteristics. Special attention was given to requirements concerning load capacity, quantising distortion (including performance at very low signal levels) and circuit noise. Acceptable values for each quantity were determined and certain compression characteristics examined in the light of these requirements The final choice of fundamental characteristics was based mainly on consideration of speech, and the new systems should provide a suitable standard for any conditions of use for telephony that can be envisaged at present. It is believed that other services that the systems may be required to transmit impose less onerous conditions than those for speech, and so it is expected that they will also satisfy requirements for these other services.

Report on CCITT data communications study group meeting

Data communications was the subject of a two-week meeting held 24 September through 4 October 1963, in Geneva, Switzerland, by the International Telegraph and Telephone Consultative Committee (CCITT) Special Study Group A. Previous meetings of this group had been held in Geneva in April, 1960, and October, 1961. The CCITT has traditionally been responsible for all standardization activities involving the public telecommunications network of the world. Among the 150 participants, there were eleven USA representatives who represented the Government, various business machine companies and the common carriers.