28-03-2011, 02:21 PM
cordect presentation.ppt (Size: 525 KB / Downloads: 159)
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.
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
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
Architecture And Components
DECT Interface Unit (DIU),
compact base stations (CBS),
subscriber access units
DECT Interface Unit
Compact Base Station
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