Smart Machine Smart Decision
6.5
LED indicator
A red led indicates the power status, when a valid power appears, the red led will lighten up. But a lighten up red
led does not mean that the terminal has been powered up.
A green led indicates the terminal status and GSM net status, after the terminal been powered up and registered to
the network, it will blink at a certain frequency.
Figure 16: Indicator LED
Table 13: Status of the NETLIGHT indicator (Green)
Status
T900 behavior
Off
T900 is not running
64ms On/ 800ms Off
T900 not registered the network
64ms On/ 3000ms Off
T900 registered to the network
64ms On/ 300ms Off
GPRS communication is established
6.6
SIM Card Interface
The SIM interface complies with the GSM Phase 1 specification and the new GSM Phase 2+ specification for
FAST 64 kbps SIM card. Both 1.8V and 3.0V SIM card are supported. The SIM interface is powered from an
internal regulator inside the terminal.
T900 supports SIM card “hot” plug, which means that the terminal can sense the SIM card inserted in or drawn
out when the module is on
AT command “AT+CSDT” is used to enable or disable SIM card detection function. For details of this AT
command, please refer to the following table.
Table 14: AT+CSDT Switch On or Off Detecting SIM Card
AT+CSDT Switch On or Off Detecting SIM Card
T900_User Guide_V1.02
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Summary of Contents for T900
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