Wireless in local loop: Some key issues*
Wireless links are emerging as a superior alternative to the copper pair for the local loop in telephony. However, to provide for sufficient subscriber density with a reasonable bandwidth allocation, a micro-cellular architecture is a must. Further, the wireless local loop system is best interfaced as a remote access unit to an exchange. The V5.2 standard provides a convenient protocol for interfacing in this manner to all exchanges. © 1995 by the IETE.
Reliable fibre-optic ring network for process control
In this paper, a counter-rotating slotted ring network is proposed to meet the communication requirements of a manufacturing plant. The network is required to carry real-time data traffic and real-time traffic generated by digitized voice and digitized video. In the design of the system, particular emphasis is placed on reliability and ring maintenance. To achieve this and compensate for the vulnerability of the ring topology, a novel intelligent transceiver unit is presented. The intelligent transceiver unit monitors the ring and automatically reconfigures the ring in the case of link or station failure. A prototype of this network has been implemented.
Technological and deployment challenges and user-response to uninterrupted DC (UDC) deployment in Indian homes
This paper presents a load-management innovation to provide a limited but uninterrupted DC power supply to homes in India. In a typically power deficient situation, load shedding becomes unavoidable. The duration and areas where load is shed are typically cycled. In worst situation, power outages last for a greater part of the day. To enable every home to get at least a limited amount of power 24×7, an innovative approach that combines use of DC power and load management has been proposed and implemented in several hundred homes in various locations. In order to make best use of limited power, a DC power line and energy efficient DC appliances are introduced and installed at homes. The approach also enables addition of solar power directly to the DC power line and use of battery, without any converter; the power-limit on DC line can thus be overcome. The paper describes the rationale, implementation and user feedback of the approach. Further improvements and plan for future are indicated.
Rural base station powering: Optimal configuration and usage of energy sources
The number of BTS (Base transceiver stations) are increasing as the number of cellphone subscriber base is expanding and hence the need for analyzing the energy consumption of the constituents of the shelter becomes important. This paper briefly considers the various sources and loads at the telecom towers, introduces an simulation tool developed using Matlab, and ends by demonstrating alternate strategies to significantly reduce costs, energy consumption and carbon footprints. © 2012 IEEE.
Design and performance evaluation of a low bit-rate packet radio network
A wireless wide-area network, capable of catering to low bit-rate applications is developed. The issues involved, both hardware and software, in the design of such a network are discussed. The network was operated under different conditions of error and the performance' analyzed. Computer simulation is employed to study the effect of traffic on the delay offered by the network.
The role of technology in telecom expansion in India
It is not viable to expand the telecom network in India substantially at the prevalent level of per-line investment. However, systems based on new technologies, many developed in India, promise to more than halve the investment required. This article looks at the telecom scenario, the new technologies, the Indian products based on these technologies, and the cost reductions they promise. The provision of widespread Internet service with low access tariff is an important aspect of the new approach.