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8
Welcome
Welcome
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
Standard
Basic Air
Interface
ANSI J-STD-008
TIA/EIA-IS2000
IS-95 adapted for
PCS frequency
band
cdma2000 1xRTT
AirInterface
MAS-BS
PCSC-RS
Intersystem
operations
Non-signaling
data comm.
Cellular base
station
Cellular mobile
station
PCS personal
station
PCS base station
Speech CODEC
TIA/EIA/IS-634
TIA/EIA/IS/651
TIA/EIA/IS-41-C
TIA/EIA/IS-124
TIA/EIA/IS-97
TIA/EIA/IS-98
ANSI J-STD-018
ANSI J-STD-019
TIA/EIA/IS-125
TIA/EIA/IS-96-B
TIA/EIA/IS-637
TIA/EIA/IS-657
IS-801
Speech CODEC
Short message
service
Packet Data
Position
Determination
Service (gpsOne)
Network
Service
Performance
Designator
Description
LX165_Virgin_Eng.qxd 1/22/08 5:26 PM Page 8
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