:
1/1;
20 40 CDMA ( , );
.
.
2
:
;
;
;
. , , .
CDMA,
CDMA . 3.
3
(CRC, CDMA Radio Complex). , , . 1 1. CRC :
(CSU, Channel Service Unit). CSU, 1/1 . CSU 1/1.
Ethernet-. CRC Ethernet-, . 10BaseT (10 /, ), RJ45.
. CRC ( ). , , T1/E1 DS0, .
1/1. CRC , DS1 . , CRC , () .
1/1, .
CDMA. CRC CDMA, - (TFU), , . : 19,6608 MHz, , .
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. CRC , :
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4 ( 1/1) .
CDMA (CCU, CDMA Control Unit). CCU. . CCU, . CCU , , . CCU , CCU CDMA (CBR).
CCU .
CCU-20. CDMA (CCU-20), 20 (). -20 40 . 38 (18 CCU), (// ). (ASIC, Application Specific Integrated Circuit), ( ). CRC 5ESS 1/1. , , , , CRC.
CCU-32 , , 2G 3G-1X. CCU-32. 64 . , , , 62 . CCU-32 186 3- . (// ) . .
CCU . CCU, CCU .
(). , CDMA, . CDMA. CDMA, ( ) .
CDMA (CBR, CDMA Baseband Radio) : CDMA , , , () .
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CBR .
CBR :
( ) ;
30 0,5 ;
;
.
CBR 19,6608 CCU :
CCU , CCU;
CCU ( CBR) , CCU.
. , CBR, CCU. , CBR CCU. CCU , CCU.
. CBR, . , .
. CBR. , . .
CDMA. :
, , , CBR ;
(LNA, Low Noise Amplifier) -.
CDMA . -, CBR , . .
. ( Tx0, Rx0 Rx1), ( Tx/Rx0 Rx1). , , ( ) . . . 30 ( ) ( ). , - , , -.
- (TFU, Time Frequency Unit). CDMA, CBR CCU, GPS CDMA . TFU , CDMA. CDMA , . , Navstar (GPS). , .
TFU (OM, Oscillator Module) 15 .
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TFU .
TFU :
GPS, GPS, TFU;
(OM), 15 .
TFU .
(EvenSecTic), , (CST, CDMA System Time). 19,6608 .
(CST) ASCII-, , , 00:00:00 UTC 6 1980 . EvenSecTic.
10 , 15 , .
(OM, Oscillator Module). TFU. 15 . , .
, .
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25 ;
7 , , . ( , GPS.)
. TFU. , , .
CDMA (CTRM, CDMA Test Radio Module). , - . CDMA , . CTRM . CTRM, - .
(PCU, Power Converter Unit). . . . 1 , . .
. , . .