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CDMA technology uses a feature called DSSS (Direct Sequence Spread Spectrum) that enables the phone to keep communication from being crossed and to use one frequency channel by multiple users in the same specific area. This results in a 10-fold capacity increase when compared with analog mode. In addition, features such as soft / softer handoff, hard Handoff, and dynamic RF power control technologies combine to reduce call interruptions.

The Cellular and PCS CDMA networks consist of MSO (Mobile Switching Office), BSC (Base Station Controller), BTS (Base Station Transmission System), and MS (Mobile Station). The following table lists some major CDMA standards.

*TSB-74: Protocol between an IS-95A system and ANSI J- STD-008

1xRTT system receives twice as many subscribers in the wireless section as IS-95. Its battery life is twice as long as IS-95. High-speed data transmission is also possible.

CDMA

Designator

Description

Standard

 

 

 

TIA/EIA-95A

CDMA Tri-Mode Air Interface

 

TSB-74

14.4kbps radio link protocol and

Basic Air

ANSI J-STD-008

inter-band operations

Interface

IS-95 adapted for PCS frequency

 

 

band

 

TIA/EIA-IS2000

cdma2000 1xRTT AirInterface

 

ANSI TIA/EIA 553A

Advanced Mobile Phone Service

 

 

 

 

TIA/EIA/IS-634

MAS-BS

Network

TIA/EIA/IS/651

PCSC-RS

TIA/EIA/IS-41-C

Intersystem operations

 

 

TIA/EIA/IS-124

Nom-signaling data comm.

 

 

 

 

TIA/EIA/IS-96-B

Speech CODEC

 

TIA/EIA/IS-99

Async Data and Fax

 

TIA/EIA/IS-637

Short message service

Service

TIA/EIA/IS-657

Packet Data

 

IS-801

Position Determination

 

 

Service (gpsOne)

 

TIA/EIA/IS-707-A

High Speed Packet Data

 

 

 

 

TIA/EIA/IS-97

Cellular base station

Performance

TIA/EIA/IS-98

Cellular mobile station

ANSI J-STD-018

PCS personal station

 

ANSI J-STD-019

PCS base station

 

TIA/EIA/IS-125

Speech CODEC

 

 

 

8AX5000

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