Viva Series, Instrument connections - All other connections, Cntrl.. Key 409
19 Instrument connections - All other connections, Cntrl.. Key
19.1 Digital Cellular Phones
19.1.1 Overview
Description For digital cellular phones, information such as
• the base stations that can be contacted
• the phone numbers of the base stations and
• the type of protocol to be used
can be defined.
Changing the base station to be dialled is of interest in two cases.
Technologies
Case 1: Two real-time base stations, each equipped with a digital cellular phone, are
set up at two locations belonging to different network providers.
When leaving the area of one base, the station can be changed and the
other base can be called.
Case 2: Set up as in case 1.
Two separate fixes from each base for each point can be obtained, providing
redundancy for future least squares adjustment operations.
CDMA Code Division Multiple Access is a high speed data transmission for effective
and flexible use of available resources such as bandwidth. Users of a cellular
phone network occupy the same frequency band. The signal is especially
coded for each user.
GSM Global System for Mobile Communications is a more efficient version of
CDMA technology that uses smaller time slots but faster data transfer rates.
It is the world’s most commonly used digital network.
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