Nor Kumalasari Caecar Pratiwi

23212301

SISTEM KOMUNIKASI NIRKAWAT

CORDLESS TELEPHONE TECHNOLOGY

CT1, CT2 & DECT

CORDLESS TELEPHONE

Cordless telephone system are full duplex communication systems that

use radio to connect a portable handset to a dedicated base station,

which is then connected to a dedicated telephone line with a specific

telephone number on the public switched telephone network (PSTN).

Cordless Handset

Public Switched

Telephone

Network (PSTN)

Fixed Port

(Base Station)

CORDLESS TELEPHONE

Cordless Telephone Standart

Analog Digital

CT0 CT1 ISM

CT1+

CT2 DECT PHS PCN PCS ISM

CVSD ADPCM SSCT2+

Classify Of Various Cordless Systems

CT1

First Generation of analog cordless telephones that was standardized by

the 

European Conference of Postal and Telecommunications Administrations

 (CEPT) in 1984 and deployed in eleven European countries.

CT1 Standard

System CT1 CT1+

Frequency Band 914 - 915 MHz / 959 - 960 MHz 885 – 887 MHz / 930 – 932 MHz

Access Method FDMA FDMA

Duplex Method FDD FDD

Number Of Carriers 40 80

Channel Per Carriers 1 1

Channel Spacing 25 KHz 25 KHz

Modulation FM FM

CT2

Second Generation of cordless telephones introduced in Great Britain in

1989.

CT2 offers good speech quality, is more resistance to interference, noise

and fading, and uses a compact handset with built-in antenna.

Digital transmission provides better security.

CT2 Standard

Parameter Specification

Frequency 864.10 MHz – 868.10 MHz

Multiple Access FDMA

Duplexing TDD

Number of Channels 40

Channel Spacing 100 kHz

Number of Channel/Carrier 1

Modulation Type 2 Level GMSK (BT = 0.3)

Channel Data Rate 72 Kbps

Spectral Efficiency 50 Erlangs//MHz

Bandwidth Efficiency 0.72 bps/Hz

Speech Coding 32 kbps ADPCM (G.721)

Max. Effective Radiated Power 10 mW

Receiver Sensitivity 40 dB V/m or better @ BER of 0.001

Frame Duration 2 ms

Channel Coding (63,48) Cyclic Block Code

To Mobile From Mobile

2 millisecond

G D 64 bits of end-user information D G

G ~ Guard Time = 8-bitsD ~ Data Channel (Control Information) = 4-bits

CT2 Standard

Structures Frame CT2

Digital Enhanced Cordless Telephone (DECT)

Universal cordless telephone standard developed by the European

Telecommunication Standards Institute (ETSI). It is first European

standard for cordless telephone and was finalized in July 1992.

DECT provides a cordless communication framework for high traffic

density, short range telecommunications and covers a broad range of

application. Offers excellent quality and services for voice and data

applications.

DECT Architecture

DECT Functional Concept Block Diagram

Parameter Specification

Frequency Band 1880 MHz – 1900 MHz

Number of Carriers 10

RF Channel Bandwidth 1.728 MHz

Multiplexing FDMA/TDMA 24 Slots per frame

Duplex TDD

Spectral Efficiency 500 Erlangs//MHz

Speech Coder 32 kbps ADPCM

Average Transmitted Power 10 mW

Frame Length 10 ms

Channel Bit Rate 1152 kbps

Data Rate 32 kbps Traffic Channel6.2 kbps Control Channel

Channel Coding CRC 16

Modulation GFSK (BT = 0.3)

Diversity Yes

DECT Standard

DECT Standard

DECT TDMA Frame Structure

DECT Standard

TERIMAKASIH