corDECT Wireless Access System An Indian way to Wireless Revolution

Why corDECT ? Cost of setting up traditional copper based telephone networks very high Developing countries like India will require 35-million pair kilometers of copper cable to maintain existing waiting lists.

Why corDECT ? The cost of Copper Increasing Wireless reduces the cost of Access part of network which consists of 70% of total costs Still cost of setting up Base stations and their controllers very high

Why corDECT ? Eliminates the physical connections between telephone exchanges and subscribers Has a simple technology structure, easier to implement, supports large number of subscribers Costs less than traditional Wireless Structure used by Mobile Operators

The Torch Bearers Indian Institute of Technology, Madras, Midas Communication Technologies, Madras, US semiconductor manufacturer Analog Devices Inc.

The Technology Based on the Digital Enhanced Cordless Telecommunication (DECT) Standard Built around a micro cellular architecture corDECT micro cell could be as small as 250-meters.

The DECT Standard Defines the air interface for users. Specifies the interface between the subscriber terminal and the base stations. DECT/GSM,DECT/ISDN and DECT/PSTN inter networking profiles

The DECT Standard The DECT frequency band is 1880-1900MHz. The standard uses 32kbps ADPCM (Adaptive Differential Pulse Code Modulation)

Channel structure corDECT 20 MHz 24 Channels 12 forward channels 12 reverse channels

Architecture And Components DECT Interface Unit (DIU), compact base stations (CBS), subscriber access units

DECT Interface Unit ADPCM switch that serves as an interface between the public switch telephone network and the CBS. Each DIU is connected to a maximum of 20 CBS and each CBS Courtesy: http://www.tenet.res.in

Compact Base Station The CBS is a small, pole-mounted or wall-mounted electronic unit that provides 12 simultaneous speech channels. Serves cell upto 50-1000 meters Each line can carry four ADPCM speech channels and one channel of 16kbps signaling

The Subscriber Unit Subscriber Unit for looks for access to strongest base channel Locks to the quietest of the available 12 channels Ensures Interference free Communication Encryption Protects from Eaves Dropping

The Subscriber Unit The handset is a small, portable battery operated unit that allows subscribers limited mobility at pedestrian speed. Can be operated upto 200m from CBS The subscriber can have access to any CBS connected to one DIU. A wallset can be used three-kilometers from a CBS

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. Good Market in developing Countries like India, Russia, China etc. Good for highly dense urban areas