Technical Details - LG TM250 User Manual

Technical Details

The TM250 is a dual-band phone that operates on both
Code Division Multiple Access (CDMA) frequencies:
cellular services at 800 MHz,
Communication Services (PCS) at 1.9 Ghz.
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.
26
LG-TM250
CDMA Standard
and Personal Basic Air Interface
Network
Service
Performance
* 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. High-speed data transmission is also possible.
LG-TM250
Designator Description
TIA/EIA-95A CDMA Dual-Mode Air Interface
14.4kbps radio link protocol and
TSB-74
inter-band operations
ANSI J-STD-008
IS-95 adapted for PCS frequency
TIA/EIA-IS2000
band cdma2000 1xRTT Air Interface
TIA/EIA/IS-634
MAS-BS
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
Assign data and fax
TIA/EIA/IS-99
Short message service
TIA/EIA/IS-637
Packet data
TIA/EIA/IS-657
Position Determination Service
(gpsOne)
IS-801
Cellular base station
TIA/EIA/IS-97
Cellular mobile station
TIA/EIA/IS-98
PCS personal station
ANSI J-STD-018
PCS base station
ANSI J-STD-019
TIA/EIA/IS-125
Speech CODEC
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