Technical Manual

3. ELECTRICAL DESCRIPTION
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LZT 123 7607 R1B
3.5 SIM Card Reader
The module is fitted with a SIM card reader designed for 3 V and 5 V SIM
cards. It is the flip-up type which is lockable in the horizontal position and
is accessed through a removable panel as shown below.
The SIM card reader incorporates a SIM presence switch which detects
whether a SIM card is inserted. The full operation of the GT47 relies on a
SIM card being inserted.
Caution! Some GT47 functionality may be lost if you try to operate the control
terminal without a SIM card.
The SIM presence switch also ensures that when a SIM card is inserted or
removed the unit is reset, as long as the GT47 is switched ON.
3.6 Real Time Clock
The module contains a real time clock (RTC) to maintain accurate
timekeeping and to enable “timestamping” of messages.
The RTC is powered all the time that the GT47 is turned on. When the
GT47 is powered off, a storage energy device within the module provides
back-up power to maintain the RTC for several hours - please contact Sony
Ericsson Customer Support for more information.