. 2004 1 300 .
1 G . , - .
2 G - .
3 G - . . 2,5G .
- 100 ! , 3G.
GSM
GSM . :
;
;
, .
, . :
(Callfor warding);
(Call barring);
(Call waiting);
(Call holding);
(Global roaming).
, , . . , .
/ , .
, - . - , .
, , ( ) .
, , GSM .
. GSM , :
- (Calling Line Identifica) (Calling Line Identification Restriction);
|
|
- (Multi party);
- (Closed User Group);
- ;
- (Advice of Charge);
- (Alternative Line Service);
- (Short Message Service);
- (Voice mail).
.
.
-, , .
( ) , . , .
, , . .
, .
, . , . .
(SMS) 160 , .
( ). , " ".
GSM :
SIM-;
EFR (Enhanced Full Rate);
GSM DECT;
GPRS (General Packet Radio Service) HSCSD (High Speed Circuit Switched Data).
GSM :
;
;
;
.
GSM , ( ) , :
SIM- ;
;
;
;
, ;
GSM ;
GSM DCS 1800, PCS 1900, DECT, (Globalstar, Inmarsat-P, Iridium).
|
|
GSM :
890-915 ;
935-960 - .
45 .