, ( ) .
AMPS , . - , . 1992 . D-AMPS, IS-54 (IS - Intermediate Standard - , Intermediate Svstem - , - - In-Service - ). 1993. . GSM: GSM 900 - 900,0.
GSM 900 124 , , , , , - ISDN .
GSM 900 1991.
, D-AMPS, 1993 .; JDC, 1994 . - PDC - Personal Digital Cellular - " ".
D-AMPS (). AMPS: D-AMPS AMPS, .
EDGE (GSM/EDGE), IS-136, 1996. IS-136 AMPS D-AMPS (IS-54), .
GSM 1800 1800,0 : .
GSM 1800 GSM 900 , :
- () , , MS.
DCS1800 - Digital Cellular System - . PCN - Personal Communications Network, " ". PCN 1993 ., 1996 . GSM 1800.
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1800,0 , 1900,0, - PCS - Personal Communications Systems, 1800,0, (cellular).
PCS IS-136 1995.
D-AMPS (IS-136). AMPS 1900,0 .
MS:
MS :
- - Mobile Equipment - ().
- (-) - SIM - Subscriber Identity Module - (), .
- , - IMEI - International Mobile Equipment Identity - , .
- SIM, , IMSI - International Mobile Subscriber Identity - () ().
IMEI IMSI:
- IMEI - MS ().
- IMSI - ( ).