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: http://www.naic.edu/~phil/rfi/cellphone/cellphoneInfo.html
Дата изменения: Tue Sep 20 22:42:33 2005 Дата индексирования: Sat Dec 22 15:11:44 2007 Кодировка: Поисковые слова: п п п п п п п |
Service | gen | Frequency
U-uplink D-downlink |
chn spacing | format | who | notes |
AMPS (analog)
advanced mobile phone service |
1g
1983 |
824-849U
869-894D |
30 khz
416 U total 416 D total |
fdma
each cell used a different freq analog |
||
D-AMPS
digital amps IS-54 original IS-136-msging |
2g
1990 |
824-849U
869-894D |
30khz | tdma each amps chan split into 3 time slots and digital compression applied | us
canada cingular usCellular |
end of life, moving to gsm |
GSM | 2g
1991 |
850:
824-849U 869-894D 1900 1850-1900U 1930-1990D |
200 Khz
14.4kbps |
fdma for chan
tdma within chan (gaussian min shift keying) (more info) |
in pr
cingular |
|
cdmaOne
IS-95 (qualcom) us |
2g | Each carrier
1.25Mhz |
spread spectrum | |||
gprs
General Packet Radio Service |
2.5 | 200Khz
30/70kbs |
Uses unused tdma chan of gsm
packet switched Used for text, msging |
extension to gsm | ||
cdma20001xrtt | 3g | 2*1.25Mhz
144kbit/s |
spread spectrum
extension of cdmaOne |
verizon | not compatible with w-cdma | |
UMTS
Universal Mobile telecom |
3g
2004 |
850:
824-849U 869-894D 1900 1850-1900U 1930-1990D |
5Mhz Chnspc
1920kbps |
w-cdma | cingular to deploy in Us 2005 | suceeds gsm |