Chapter 4 – Non-Electrical Interfaces
Multi-Tech Systems, Inc. MMCModem GPRS Developer’s Guide (S000445D)
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Chapter 4 – Non-Electrical Interfaces
This chapter describes the non-electrical interfaces.
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Flashing LED non-electrical interface
•
SIM non-electrical interface
•
RF non-electrical interface
•
DTE/DCE Rates non-electrical interface
Flashing LED
The flashing LED signal is used to indicate the working mode of the MMCModem.
LEDs and the MMCModem Status
LED Indication
MMCModem Status
OFF
Download mode or switched OFF.
ON
Permanent:
Switched ON, not registered on the network.
Flashing:
Switched ON, registered on the network.
SIM Interface
The internal SIM interface supports 3V SIMs only.
Note:
This interface is fully compliant with GSM 11.11 recommendations concerning the SIM
functionality.
Five Signals Are Available
SIMVCC: SIM power supply.
SIMRST: reset.
SIMCLK: clock.
SIMDATA: I/O port.
SIMPRES1 SIM card detect.
