General Instruction - Samsung SCH-A205 Service Manual

1. General Instruction

The SCH-A205 cellular phone functions as both analog cellular phone working in AMPS(Advanced
Mobile Phone Service) mode and Digital cellular phone working in CDMA(Code Division Multiple
Access) mode.
CDMA type digital mode applies DSSS(Direct Sequential Spread Spectrum) mode which first came
to be used in the military.
The DSSS reduces channel cross talk and allow to use one frequency channel by multiple users in
the same specific area, resulting in increase of channel capacity to about ten times compared to that
of analog mode currently used.
Soft/Sofer Handoff, Hard Handoff, and Dynamic RF Power Control technologies are combined into
this phone to reduce the call drop while usage.
CDMA digital cellular network consists of MSO(Mobile Switching Office), BSC(Base Station
Controller), BTS (Base Station Transmission System), and MS(Mobile Station). MS meets the specifi-
cations of the below :
¥ IS-95A : Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread
Spectrum Cellular System
¥ IS-96A : Speech Service Option 1 Standard for Dual-Mode Wideband Spread Spectrum Cellular
System
¥ IS-98A : Standards for Dual-Mode Wideband Spread Spectrum Cellular Mobile System
¥ IS-126 : Mobile Station Loopback Service Options Standard
SCH-A205 is composed of main handset, one battery(800mAh), ear-microphone, and rapid DTC.
Travel adaptor(or travel charger) and HFK is optional. Hands-Free Kit is designed to be operated in
full-duplex mode taking turn-around delay between the phone and the system into account.
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