CorDECT is an advanced Wireless Access system designed keeping the economic realities of a country like India in mind. It has been developed by Midas Communication Technologies and IIT, Madras, in association with Analog Devices, USA.
The technology provides a complete wireless access solution with seamless integration of both voice and Internet services, providing simultaneous toll-quality voice and 35 / 70 kbps Internet access to wireless subscribers. CorDECT is based on the DECT air interface standard specification from the European Telecommunication Standards Institute (ETSI).
The corDECT air interface supports 10 kms of line-of-sight connectivity and has the provision to extend this to 25 kms using Repeaters.
The DECT Interface Unit ( DIU )
Wall Set with Internet
Port (WS-IP)
The
iKON Remote Access Switch (RAS)
Network
Management
The
Compact Base Station (CBS)
The
Relay Base Station (RBS)
The
Base Station Distributor (BSD) 
The DIU is a fully redundant subscriber radio exchange with 2 OMC PC Consoles. It can also act as a voice PBX with up to 8 E1 connections (using R2-MF or V5.2 protocols) to PSTN/Voice.
It switches voice traffic to the telephone network using the V5.2 protocol to connect to an exchange. It also switches Internet calls to a built-in Remote Access Switch (RAS), which then routes the traffic to the Internet network.
System reliability is guaranteed by a redundant hot stand-by architecture. The OMC (Operation and Maintenance Console) allows real-time monitoring and management of the entire corDECT system. A fully configured DIU consumes less than 600 W power.
Wall Set with Internet Port (WS-IP)
The Wall Set is the equipment at the subscriber premises. It has 2 ports, one a standard 2 wire RJ11 interface for connecting to a DTMF or decadic telephone, FAX machine or modem. The other is an RS232C Internet port for connecting to a computer obviating the need for a modem. The PC establishes an Internet connection using a standard dial-up utility. This means that voice and Internet can be used simultaneously.
The power to the Wall Set is provided by a 12V adaptor connected to the mains, or by a solar panel connected in parallel. It has a built-in battery charger providing 16 hour standby and 3 hours talk time for voice calls.
The iKON Remote Access Switch (RAS)
The IKON RAS terminates the connections from the subscribers and is connected to the DIU using 2 E1 ports. It does IP routing for 60 simultaneous corDECT Internet calls. The RAS has a 10baseT Ethernet port to connect to the Internet. It supports RADIUS for accounting, PAP for user authentication and is managed using SNMP.
CorDECT provides comprehensive operation and maintenance through the corVIEW OMC Console. The features include hardware and software configuration, subscriber administration, accounting, fault notification and traffic. The functions range from a bird’s eye-view of the operational status of a network of corDECT systems to probing the internals of an individual wall set.
CorVIEW supports the SNMP protocol and can be connected to the corDECT system by any IP network.
The Wall Set can be connected to the DIU through:
1.
Compact Base Stations (CBS), for distances up to 10Km (Details)
2. Relay Base Station (RBS), for distances up to 25Km (Details)
3. Base Station Distributor (BSD), for distances beyond 35Km (Details)
The Compact Base Station (CBS)
The CBS provides the radio interface between DIU and Wall Set. It is connected to the DIU through 3 pairs of twisted pair copper wires. The DIU feeds both power and signal to the CBS. A DIU can be connected to up to 20 CBS and each CBS supports up to 12 simultaneous voice calls. See diagram below.
The RBS extends the range of the corDECT system by another 25km. It relays DECT packets between the CBS and subscriber units through a two-hop DECT wireless link, one between WS-IP and RBS and the second between RBS and CBS. It can handle 11 calls simultaneously. See diagram below.
The Base Station Distributor (BSD)
The BSD is a compact, remotely located, locally powered, rack-mountable unit that supports up to 4 CBS. It connects on an E1 interface to the DIU, which may be on copper, fibre or radio. The link distance depends only on the link design. It is designed to connect pockets of subscribers located far away from the DIU. See diagram below.
