GSM (HR, FR EFR) , . . . .
(AMR) . . , .
. , (AMR) , . . .
(AMR) BSC . , BSS BSS. MSC , " BSS BSS".
3.1.12 : GSM
. , . . 3.2 .
CDA ( ) | 300 / 9600 / |
PAD | 300 / 9600 / |
CDS ( ) | 1200 / 9600 / |
/ CDA | |
CDA |
3.2 .
, " " (, BS20, BS30, BS40). BS20 GSM BS21 BS26. (300-9600 /).
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V.42 ITU-T BS2, BS4 BS61/BS81 (. " D900/D1800", " ", " ").
MSC (IWF), D900/D1800. GSM, () . D900/D1800 GSM :
3,1 ,
64 /, .
(IWE) MSC, , , 1, .
CDA (BS21, 22, 23, 24, 25, 26)/(BS20)
, (PSTN) , D900/D1800 "" . (IWE) MSC. "3,1 , ".
, , "" (MS). / (), , /.
" ", .
. 3.13 GSM (CDA ) (3,1 , ), D900/D1800.
IWE . , 64 /, .
3.13 GSM ( CDA) ( 3,1 , ).
GSM . - GSM, . , , , ( ).
(RLP) ( ) MS MSC 2 . (ARQ).
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. , "". "" , RLP.
(RA) GSM ( TRAU BSS MSC) 64 / -. . (ISDN) " 64 /" RA MSC (. 3.14). (. " SSS", 2, " ", " "; " SSS", 1, "", " 23").
3.14 GSM ( CDA) ( 64 /, ).
CDS (BS31, 32, 33, 34)/(BS30)
GSM PSDN, X.32 (. 3.15) (PH) (. 3.16). X.32 PH CDS, .
X.32 PSDN X.32. (PH) PSDN X.31, " " (X.31 ) " " (X.31 ). X.31 , PLMN. X.31 MSC , .31 MSC . (. " SSS", 1, "", " 3, NT").
3.15 GSM ( CDS) .32.
3.16 GSM ( CDS) () .31.
/ PAD (BS41, 42, 44, 45, 46)/ (BS40)
GSM PSDN / (PAD). PAD CDA, , . , GSM ( .25).
MSC " PAD", . MSC, /, MSC, PSDN, , PSDN, PABX, MSC. " PAD" D900/D1800.
( GSM PAD), MSC PAD. " 64 /" " 3,1 , " (. 3.17). (. " SSS", 1, "", " PAD, 41, 42, 44, 45, 46").
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3.17 GSM ( PAD).
/ (BS61) (BS81)
GSM . " (ICM)". ICM MSC-IWF MS MSC. " 3,1 ". , . (. " SSS", 1, "", " 61/81").