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SUBJECT The LX325 phone has been designed to operate on the latest digital mobile communication
technology, Code Division Multiple Access (CDMA). This CDMA digital technology has greatly
enhanced voice clarity and can provide a variety of advanced features. Currently, CDMA mobile
communication technology has been commercially used in Cellular(DCN) and Personal
Communication Service (PCS). The difference between them is the operating frequency
spectrum. Cellular uses 800MHz and PCS uses 1.9GHz. The LX325 can operate on both
frequency, we usually call it Dual-band phone. Also, LX325 works on Advanced Mobile Phone
Service (AMPS). We call it Tri-mode phone. If one of the DCN, PCS and AMPS base stations is
located nearby, Call fail rate of Tri-mode phone is less than dual-mode phone or single-mode
phone.
The CDMA technology adopts DSSS (Direct Sequence Spread Spectrum). This feature of
DSSS enables the phone to keep communication from being crossed and to use one frequency
channel by multiple users in the same specific area, resulting that it increases the capacity 10
times more compared with that in the analog mode currently used. Soft/Softer Handoff, Hard
Handoff, and Dynamic RF power Control technologies are combined into this phone to reduce
the call being interrupted in a middle of talking over the phone.
Cellular and PCS CDMA network consists 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.
CDMA Standard Designator Description
Basic air interface TIA/EIA/IS-95-A
ANSI J-STD-008 Protocol between MS and BTS for Cellular & AMPS
Protocol between MS and BTS for PCS
Network TIA/EIA/IS-634
TIA/EIA/IS/651
TIA/EIA/IS-41-C
TIA/EIA/IS-124
MAS-BS
PCSC-RS
Intersystem operations
Nom-signaling data comm.
Service TIA/EIA/IS-96-B
TIA/EIA/IS-99
TIA/EIA/IS-637
TIA/EIA/IS-657
Speech CODEC
Assign data and fax
Short message service
Packet data
Performance TIA/EIA/IS-97
TIA/EIA/IS-98
ANSI J-STD-018
ANSI J-STD-019
TIA/EIA/IS-125
Cellular base station
Cellular mobile station
PCS personal station
PCS base station
Speech CODEC