corDECT corDECT Wireless Access SystemWireless Access System

An Indian way to Wireless An Indian way to Wireless RevolutionRevolution

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Why corDECT ?Why corDECT ?

Cost of setting up traditional copper Cost of setting up traditional copper based telephone networks very highbased telephone networks very high

Developing countries like India will Developing countries like India will require 35-million pair kilometers of require 35-million pair kilometers of copper cable to maintain existing copper cable to maintain existing waiting lists. waiting lists.

Why corDECT ?Why corDECT ?

The cost of Copper IncreasingThe cost of Copper Increasing

Wireless reduces the cost of Access Wireless reduces the cost of Access part of network which consists of part of network which consists of 70% of total costs70% of total costs

Still cost of setting up Base stations Still cost of setting up Base stations and their controllers very highand their controllers very high

Why corDECT ?Why corDECT ?

Eliminates the physical connections Eliminates the physical connections between telephone exchanges and between telephone exchanges and subscriberssubscribers

Has a simple technology structure, Has a simple technology structure, easier to implement, supports large easier to implement, supports large number of subscribers number of subscribers

Costs less than traditional Wireless Costs less than traditional Wireless Structure used by Mobile OperatorsStructure used by Mobile Operators

The Torch BearersThe Torch Bearers

Indian Institute of Technology, Indian Institute of Technology, Madras, Madras,

Midas Communication Technologies, Midas Communication Technologies, Madras, Madras,

US semiconductor manufacturer US semiconductor manufacturer Analog Devices Inc. Analog Devices Inc.

The TechnologyThe Technology

Based on the Digital Enhanced Based on the Digital Enhanced Cordless Telecommunication (DECT) Cordless Telecommunication (DECT) Standard Standard

Built around a micro cellular Built around a micro cellular architecture architecture

corDECT micro cell could be as corDECT micro cell could be as small as 250-meters.small as 250-meters.

The DECT StandardThe DECT Standard

Defines the air interface for users. Defines the air interface for users.

Specifies the interface between the Specifies the interface between the subscriber terminal and the base subscriber terminal and the base stations. stations.

DECT/GSM,DECT/ISDN and DECT/GSM,DECT/ISDN and DECT/PSTN inter networking profilesDECT/PSTN inter networking profiles

The DECT StandardThe DECT Standard

The DECT frequency band is 1880-The DECT frequency band is 1880-1900MHz. 1900MHz.

The standard uses 32kbps ADPCM The standard uses 32kbps ADPCM (Adaptive Differential Pulse Code (Adaptive Differential Pulse Code Modulation) Modulation)

Channel structure corDECT Channel structure corDECT

20 MHz

24 Channels

12 forward channels 12 reverse channels

Architecture And ComponentsArchitecture And Components

DECT Interface Unit (DIU),

compact base stations (CBS),

subscriber access units

DECT Interface UnitDECT 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 StationCompact 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 UnitThe Subscriber Unit

Subscriber Unit for looks for access Subscriber Unit for looks for access to strongest base channelto strongest base channel

Locks to the quietest of the available Locks to the quietest of the available 12 channels12 channels

Ensures Interference free Ensures Interference free CommunicationCommunication

Encryption Protects from Eaves Encryption Protects from Eaves DroppingDropping

The Subscriber UnitThe 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

ConclusionConclusion

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