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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 DCS-1800 system it is only 1W (Power Class 1). There are also reduced BTS power levels due to microcell
applications, which means instead of the 40W (Power Class 4) in the GSM system DCS 1800 needs only 20W
(Power Class 1).
2.3 Speech Codec
The CMD-J16 supports the following speech codecs.
• 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 CMD-J16 supports the following languages:
Taiwan:
• English • Chinese Simplified • Chinese Traditional
(for Taiwan)
Hong Kong:
• English • Chinese Simplified • Chinese Traditional
The CMD-J5 supports the following languages:
• Bulgarian • German • Romanian
• Croatian • Greek • Russian
• Czech • Hungarian • Slovak
• Danish • Italian • Slovene
• Dutch • Norwegian • Spanish
• English • Polish • Swedish
• Finnish • Portuguese • Turkish
• French
Preferences GSM 900 E-GSM DCS 1800
Frequency band
uplink:
downlink:
MHz
890 - 915
935 - 960
MHz
880 - 915
925 - 960
MHz
1710 -1785
1805 - 1880
Radio Channels 124 174 374
max. BS-Power 40 W (46 dBm) 20W (43 dBm)
max. MS-Power 2 W (33 dBm) 1W (30 dBm)