This paper describes a new wireless local loop system for rapid expansion of telecom services. It is developed under a joint project involving Indian and US participants. THE TIDE has turned and the waiting is over. The new system, called corDECT, is based on a microcellular architecture and uses a modest bandwidth of 20MHz to provide voice, fax, and data communication in low as well as very high subscriber density environments. This paper also discusses the relevance of corDECT in the context of current trends towards wireless systems, contrasts the microcellular architecture of corDECT with existing wireless systems based on macro cellular architectures, and outlines its market potential.

Now there is a faster, easier, more cost-effective way to bring advanced-technology DECT wireless local loop (WLL) to today’s demanding marketplace. Analog Devices’ corDECT is a comprehensive “turnkey” system designed to meet diverse customer needs now and well into the 21st century. CorDECT technology is based on digital enhanced cordless telecommunications (DECT) and allows telephone and Internet services together on the same line. This cost-effective technology can be a great boon to the millions of Indians who have no access to such facilities today.

corDECT is an advanced, field provens, Wireless Access System developed by Midas Communication Technologies and the Institute of Technology, Madras, in association with Analog Devices Inc., USA. Focusing on the emerging markets for basic telephony services. corDECT incorporates high-performance, software upgradeable IC technology—including Analog Devices’ AD6411 single chip radio. All DECT standards-specific functions are built in, allowing you to focus on your own value-added features and services.

corDECT, offers significant cost-savings, rapid installation, and improved reliability over traditional connections based on copper cables. It is based on a microcellular architecture that is said to offer cost and operational advantages over wireless/mobile telephone systems based on macro cellular architectures. corDECT technology is cost effective, easy-to-install in subsystems and can serve relatively high subscriber density environments – several thousands of subscribers per square kilometer.

Key Features of corDECT:

The corDECT WLL system provides features comparable to the best wire line systems. The Wall set IP provides simultaneous voice and Internet access as a basic feature. It has a sophisticated Operations and Maintenance support and a network management system for managing a corDECT network.

• Voice Quality:

 CorDECT delivers same toll-quality speech performance as a good copper-based local loop. This too-quality voice is ensured by using 32kbps ADPCM for voice digitization and transparency to DTMF signals for interactive Voice Response Systems.

• Data Services:

All voice-band data services are available from a conventional wired connection due to employment of 32kbps ADPCM.The speed of a modem/G3 fax supported using 32kbps ADPCM is 9600bps but with double sloy connection V.34 and V.90 modems can operate at full speed.

• Internet Access Speed:

 Internet Access is possible simultaneously with a voice call using Wallset IP with access rates: 35kbps and 70kbps using one and two time slots.

• Payphone/PCO:

 The system supports pay phone with battery reversal as well as 12 kHz or 16kHz metering pulses. It also supports CCB payphone.

Advantages:

Most Economical Local Loop Solution:

 CorDECT WLL provides the most economical local loop system in all situations. Because of low infrastructure, cost per line results in lower capital and lower traffic rate as compared to any other technology.

Scaleable configuration:

 The CorDECT system has been designed to serve subscriber density from 1 to 10,000 subscribers per sq.km. The typical coverage radius is 5 km extendable up to 10 km.

High Speed data:

 corDECT provides high quality-voice, 64 kbps data connectivity and ISDN service.

Proven Technology:

 The system has proven technology based on international open standards to deliver wireless voice quality.

Adaptive Channel Allocation:

 The DECT standards employs a completely decentralized channel allocation procedure called Dynamic Channel Selection (DCS). DCS renders frequency planning unnecessary, and provides low blocking with seamless handover of calls.