Technical data

88 Theoretical and general applications www.westermo.com
A limitation in bandwidth has resulted in the use of techniques so that a maximum
number of simultaneous users can be supported. This is achieved through a combina-
tion of TDM, Time Division Multiplexing and FDM, Frequency Division Multiplexing.
Frequency division (FDM) means the available 25 MHz band is divided into
200 KHz bands. In the above description of frequency utilisation between cells,
A1, B2, B3, etc are examples of frequency division.
Compilation
Frequency for transmitting from ME 880-915 MHz
to the base station
Frequency for transmitting from 925-960 MHz
the base station
Bandwidth 35+35 MHz
Access method TDMA/FDMA
Frequency per radio channel 200 KHz
Distance in frequency between 45 MHz
the downlink/uplink
Maximal radius for a cell 30 km
Minimum radius for a cell (microcell) 30 m
Maximal output power from 2 W @ 900 MHz
the mobile terminal
Frequency division
Time division multiplexing
MHz
Channel 1
Frequency 1
Channel 2
Frequency 2
Channel 3
Frequency 3
Call 1 Call 2
Time
Call 3
B A C K