Evolution(Developing Steps) of Personal Communications

Analog

Cellular

AMPS

TACS

NMT

Analog

Cordless

CT0

CT1/CT1+

JCT

Digital

Cellular

GSM

PDC

IS-95

IS-54

Digital

Cordless

CT2/CT2+

DECT

PHS

1st Generation

2nd Generation

3rd Generation

PCN

• cordless telephone

• islands of service

• low mobility

• high density of users

• low cost

• mobile telephone

• ubiquitous service

• high mobility

• low density of users

• high cost

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