corDECT
is an advanced, field proven, Wireless Access System developed by Midas Communication
Technologies and the Indian Institute of Technology, Madras, in association with
Analog Devices Inc., USA. corDECT provides a complete wireless access solution
for new and expanding telecommunication networks with seamless integration of
both voice and Internet services. It is the only cost-effective Wireless Local
Loop (WLL) system in the world today that provides simultaneous toll-quality voice
and 35 or 70 kbps Internet access to wireless subscribers.corDECT
is based on the DECT standard specification from the European Telecommunication
Standards Institute (ETSI). In addition, it incorporates new concepts and innovative
designs brought about by the collaboration of a leading R & D company, a renowned
university, and a global semiconductor manufacturer. This alliance has resulted
in many breakthrough concepts including that of an Access Network that segregates
voice and Internet traffic and delivers each, in the most efficient manner, to
the telephone network and the Internet respectively, without the one choking the
other.The corDECT Wireless Access
System (WAS) is designed to provide simultaneous circuit-switched voice and medium-rate
Internet connectivity at homes and offices.
Conceptual
Access System - In this conceptual model, there is a Subscriber Unit (SU)
located at the subscriber premises. The SU has a standard two-wire interface to
connect a telephone, cordless phone, or modem. It also provides direct (without
modem) Internet connectivity to a standard PC, using either a serial port (RS-232
or USB) or Ethernet. The access system allows simultaneous telephone and Internet
connectivity. The SU's are connected to an Access Centre (AC) using any convenient
technology like wireless, plain old copper, coaxial cable, optical fibre, or even
power lines.The AC must be scalable, serving as few as 200 subscribers and as
many as 2000 subscribers. In urban areas, the AC could be located at a street
corner, serving a radius of 700 m to 1 km. This small radius in urban areas is
important for wireless access, in order to enable efficient reuse of spectrum.
When cable is used, the small radius ensures low cost and higher bitrate connectivity.
However in rural areas, the distance between the AC and the SU could easily be
10 km even go up to 25 km in certain situations.
