2.2 Radio Frequency Power Levels:
Between the DCS 1800 and both GSM Systems are differences regarding the power level. DCS 1800 basically needs lower power levels. If the performance of a MS for GSM system was certified of 2W (Power Class 4), then in the
Preferences
GSM 900
E-GSM
DCS 1800
Frequency band | MHz | MHz | MHz |
uplink: | 890 - 915 | 880 - 915 | 1710 |
downlink: | 935 - 960 | 925 - 960 | 1805 - 1880 |
Radio Channels | 124 | 174 | 374 |
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|
max. | 40 W (46 dBm) | 20W (43 dBm) | |
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|
max.
2 W (33 dBm)
1W (30 dBm)
2.3 Speech Codec
The
•Full Rate (FR) Codec
•Half Rate (HR) Codec
•Enhanced Full Rate (EFR) Codec
The speech codec forms the human voice into a digital signal, which is sent in the GSM network. The GSM system currently has three different speech codec standards.
At first, the Full Rate (FR) Codec was introduced. With new requirements concerning speech quality and availability of radio channel resources two further standards were introduced, the Half Rate (HR) Codec and the Enhanced Full Rate (EFR) Codec. The Half Rate (HR) Codec requires only half the channel capacity of a Full Rate (FR) Channel. The Enhanced Full Rate (EFR) Codec requires the same radio channel resources as a Full Rate
(FR) Codec but offers Fixed Line quality with superior vocal clarity.
2.4 Languages
The
Taiwan:
• | English | • | Chinese Simplified | • | Chinese Traditional |
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| (for Taiwan) |
Hong Kong: |
|
|
|
| |
• | English | • | Chinese Simplified | • | Chinese Traditional |
The
• | Bulgarian | • | German | • | Romanian |
• | Croatian | • | Greek | • | Russian |
• | Czech | • | Hungarian | • | Slovak |
• | Danish | • | Italian | • | Slovene |
• | Dutch | • | Norwegian | • | Spanish |
• | English | • | Polish | • | Swedish |
• | Finnish | • | Portuguese | • | Turkish |
•French
5