Cordect Wireless Access System
Cordect Wireless Access System
Cordect Wireless Access System
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CorDECT
Wireless access system
Binoop krishna.k.g
Electronics & communication
Gptc.Nta
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INTRODUCTION
CorDECT is a WAS, provide simultaneous access of quality voice & internet
(35/70kbps)
Develop by IITM,Midas communications & Analog Devices Inc., USA
Based on microcellular architecture
The DECT standard proposed by ETSI
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Conceptual Access
System
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corDECT Wireless Access
System
corDECT WAS
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corDECT Wireless Access
System
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corDECT Wireless Access
System
Antenna
port
RS-232 port
Wall set IP
Multtiwallset 9
Compact Base Station
( CBS )
Ø Provides radio interface between DIU &
subscriber terminals
Ø supports up to 12 simultaneous voice calls
Ø The CBS has two antennas for diversity.
Ø Omni-directional antennas are used
360 coverage
Ø maximum LOS range is 10 km.
Ø 30 - 70 subscribers
Ø Remotely powered from DIU or BSD.
Ø
Ø
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DECT Interface Unit
( DIU )
Ø DIU is the heart of corDECT Wireless Access System
Ø DIU function as Switch, Base Station Controller,
Operation & Maintenance Console (OMC)
Ø DIU can support up to 20 CBS
Ø DIU acts as a 1000-line exchange
Ø RAS terminates the PPP connections from Internet
users
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iKON RAS
DIU 12
RELAY BASE STATION
( RBS )
ØPlace b/w CBS & subscriber unit
ØExtent the range of corDECT system
ØConsisting 3 antennas
ØHigh gain directional antenna receives signal
from CBS
Ø2 Omni directional antennas uses
ØMaximum LOS range b/w CBS and RBS is
25 km
ØMaximum LOS range b/w RBS & subscriber is
10 km
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INTERNET CONNECTION
ØRAS terminates PPP connection of all internet
subscribers
ØIP packets routed to internet by RAR
ØRouter can carry internet traffic from other
access system
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MC - TDMA ( Multi Carrier - Time Division multiple
Access )
Ø The DECT system has 10 radio frequency carriers in
20MHz band width
Ø Two groups of 12 slots each one group for each direction
to transmission.
Ø Each time slots act as a channel
Ø 12 X 10=120 channels
Ø Frame duration is 10ms & slot pair separated by 5 ms
Ø Each carrier is divided into frames of 24 time slots
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Major subscriber
services
Ø Alarm call service
Ø Call waiting
Ø Dual telephone number
Ø Call diversion on no replay & busy
Ø Conference calling
Ø Malicious call identification
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Ø
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References
www.tenet.res.in/cordect/cordect.html
www.midascomm.com/products.htm
www.developmentgateway.org
www.i4donline.net
www.wikipedia.com
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QUESTION
TIME….
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