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Learn about the innovative corDECT wireless local loop system eliminating physical connections between subscribers and exchanges, offering high-quality voice and data transmission. Discover its advantages, components, protocol stack, and call scenarios. Explore its architecture, features, and rapid deployment benefits for highly dense urban areas. Take advantage of cost-effective solutions and simultaneous voice and internet access. Join us in revolutionizing telecommunications with corDECT!
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corDECT Wireless Access System DONE BY ANISHA BABY NO:4
INTRODUCTION • corDECT is a new wireless local loop system. • Eliminate the physical connections between telephone exchanges and subscribers. • Based on the DECT(Digital Enhanced Cordless Technologies) standard.
It offers high quality voice and data transmission. • Easier to implement ,support large number of subscribers. • Provides simultaneous voice & internet access.
Disadvantages of wired local loop • High cost. • More faults occur. • Rapid deployment is difficult • It is expensive. These disadvantages can be solved by using corDECT wireless local loop.
Advantages of corDECT • Provides cost effective solution to local loop problems. • Easy expansion of the network . • Provides high quality voice and data and FAX capability. • Good speech quality . • Provides simultaneous voice and internet access.
The main parts of the system are • DECT Interface Unit(DIU) • Compact Base Station(CBS) • Wallset(WS) • Handset(HS)
DECT Interface Unit • Performs system control. • This can cater up to 20 base stations. • It carries signal and power feed for the base stations even up to 3kms.
Compact Base Station • This is the radio fixed part of the DECT wireless local loop. • Mounted on a tower top which can cater up to 50 subscribers. • Provides 12 simultaneous speech channels.
Wallset • It is a wireless fixed terminal adaptor . Handset • It is a portable telephone providing voice service to a user. It consist of two more parts • BSD-connects 4 CBS to DIU • RBS-extend the CBS coverage to 25kms.
Divides its 20MHz bandwidth in to 10 frequency bands. • Each time slot is divided in to 24 channels. • So that up to 12 simultaneous calls can be handled.
DECT Protocol Stack • Four protocol layers. • Physical (PHL) Layer • Specifies the division of 10ms frames. • Monitors quality of signal. • Medium Access Control(MAC) Layer • Handles handover(bearer handover) of a connection .
Data Link Control(DLC) Layer • Provides connection oriented and connectionless service. • Handles handover(connection handover). • Network(NWK) Layer • Call control. • Registration & Authentication.
Architecture & Implementation • Micro-cellular system support high speed data,voice telephony etc. Features are • Frequency is selected using Dynamic Channel Selection(DCS). • Roaming anywhere . • Authentication & Encryption. • Handover from channel to channel.
The DIU(exchange) consist of • OMC(Operation & Maintenance control ) • SWITCH(Voice/Data Path Switching Subsystem) • BIM(Base Station Interface Modules) OMC • performs call processing . • Runs the DECT NWK layer. • System operation, maintenance ,billing .
SWITCH • Switching voice between subscribers. • Runs a part of the DECT DLC layer. BIM • CBSs are connected to the DIU at the BIM • Supports two CBS.
The portable runs the entire DECT protocol stack. • Inter-Working Unit(IWU) performs billing,registration etc.
Call Scenario • Sequence of events at the DECT DLC & DECT NWK layer. • Portable A sends request to portable B. • OMC checks whether A is a valid user. • B establishes the connection. • After sometime release the connection.
CONCLUSION • It offers relatively low cost & rapid installation of telecom services in areas of even high subscriber density. • Good for highly dense urban areas. • Use telephone &internet on the same line simultaneously.
