LG Electronics TM250 manual Technical Details, Designator Description

LG-TM250

Technical Details

The TM250 is a dual-band phone that operates on both Code Division Multiple Access (CDMA) frequencies: cellular services at 800 MHz, and Personal 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.

		LG-TM250
CDMA Standard	Designator	Description
	TIA/EIA-95A	CDMA Dual-Mode Air Interface
	TSB-74	14.4kbps radio link protocol and
Basic Air Interface		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
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	Assign data and fax
		Short message service
Service	TIA/EIA/IS-637
		Packet data
	TIA/EIA/IS-657
		Position Determination Service
	IS-801	(gpsOne)
	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

* 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.

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