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application from power saving state.
In IDLE mode, the RING_N is high. It is only indicating a type of event at a time:
a)
When a voice call comes in, the RING_N line goes low for 1 second and high for
another 4 seconds. Every 5 seconds as a cycle.
b)
When a FAX call comes in, the RING_N line low for 1s and high for another 4s. Every
5 seconds as a cycle.
c)
When a Short massage comes in, the RING_N line to low for 150 mS, and always
high.
3.7.2 DCD indicate
The DCD_N signal serves to indicate CSD call or GPRS data mode. The detail definition refers
to AT&C command.
3.8 SIM Interface
The G610 incorporates a SIM interface, which conforms to the GSM 11.11 and GSM 11.12
standards, which are based on the ISO/IEC 7816 standard. These standards define the electrical,
signaling and protocol specifications of a GSM SIM card.
The G610 does not incorporate an on-board SIM card tray for SIM placement. The SIM must be
located on the user application board, external to the G610. The G610 SIM interface includes all the
necessary signals, which are routed to the interface connector, for a direct and complete connection
to an external SIM.
G610 GPRS Module Hardware User Manual
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