TDMA is the access method used by the
Electronics Industry Alliance
Telecommunications Industry Association
Interim Standard 54
Interim Standard 136
(IS-136). Using TDMA, a
that is 30 kHz wide and 6.7 milliseconds long is split time-wise into
three time slots.
Narrow band means "channels" in the traditional sense. Each conversation
gets the radio for one-third of the time. This is possible because voice
data that has been converted to digital information is compressed so
that it takes up significantly less transmission space. Therefore, TDMA
three times the capacity
of an analog system using the same number of channels. TDMA systems
operate in either the
(IS-136) frequency bands.
TDMA splits a frequency into time slots.
To read about any of the technologies click on the blue links
2G cell-phone networks
for transmitting information (we'll discuss
3G technologies in the 3G section):
Frequency division multiple access
Time division multiple access
Code division multiple access