CorDECT Technology

  

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Abstract

Internet today is not just another means of communication. Those who use internet know that internet is power. It gives a user not only all kinds of information, but also enables him/her to do things one could not even dream of till recently. But at the same time, lack of internet access would put a person at a tremendous disadvantage. Therefore, unless steps are taken to provide telecom and internet access widely and cost effectively one would face accentuation.

So introducing a digital enhanced cordless telecommunication based (DECT) wireless local loop (WLL) system called CorDECT. CorDECT is India’s very own wireless local loop technology. It provides cost effective, simultaneous high quality voice and data connectivity. The CorDECT technology can provide internet access to the subscriber through the same telephone line with 70 kbps speed without the aid of a modem and the subscriber can use the telephone and surf on the net simultaneously.

Introduction

CorDECT is a state-of-the-art wireless access system that uses the ETSI DECT air interface with extensions for wireless in local loop service to deliver toll-quality voice and data simultaneously on a per user basis. CorDECT WLL is a state of art wireless access system developed indigenously by the joint efforts of IIT, Madras and Midas Communication Technologies Pvt. Ltd., Madras with support of Dept, of Telecommunication, Govt. of India. ECIL is one among the four telecom manufacturers in India to license the product. CorDECT is a simple, cost-effective wireless access system that has made a difference to millions of lives.

The CorDECT system is indeed based on the DECT standard which initially was designed for use with cordless telephones. This is not a spread spectrum approach, and instead is based on a protocol called MC-TDMA which performs both time and frequency division in order to accommodate multiple channels. [44] The distances possible between a subscriber unit and a base station are rated at 10km. Relay base stations can be used to extend this distance a further 10km. These distances may be conservative as, given favorable Line of Site and terrain; 40km has been achieved in the field. It is true that the CorDECT system de-multiplexes voice from data at the interface unit and this is one of its strong properties.

The greatest advantage of CorDECT is the elimination of the need to run a pair of wires all the way upto the subscriber’s premises. The Wireless Local Loop is free from various problems associated with cables such as digging of trenchers, large requirement of time and money and more importantly, the various line faults which are generally attributed to wired connections. New subscriber connections can be added almost instantly as it involves only authentication of the hand set through the console.

CONCLUSION

The corDECT wireless local loop system offers relatively low cost and rapid installation of telecom services in areas with even high subscriber density environments. This microcellular system relies on a modest bandwidth of 20MHz for the entire country. Two or three DECT wireless local loop systems and DECT based local area networks could coexist in the same area without interfering with one another – all operating on the same 20MHz bandwidth. The high capacity is achieved not by using low bit-rate compression techniques but with toll quality ADPCM or PCM voice coding. The microcellular system can provide ADPCM (32kbps) or PCM (64kbps) and even ISDN (128kbps) services to users. Its developers describe it as a “future proof” system.