Perle Systems NOVACOM Wireless Modem GNS-30CR - Manual (Page 13)

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7.2 SIM card holder
The connector is intended for 1.8V or 3V SIM cards in accordance with GSM
11.12 phase 2 to operate the Modem.
The SIM card must be inserted in the card holder to put the Modem into
operation.
1) Make sure that there is no voltage applied to the Modem.
2) Operate the eject mechanism (yellow pin next to the card holder) to open the
card holder by pressing it down with a pen, for example
3) Insert the SIM card holder and push it back into the housing. Note: The
SIM card only be replaced when no voltage applied to the Modem. SIM
card pin assignments:
Signal Pin No. Input/Output Description Parameter
GND 1 X Gnd
VPP 2 X N.C
I/O 3
Input/Output Input/Output
interface
Input: Ri≥1MΩ
Output: Rо=220Ω
CLK 4
Output Clk Ro=220Ω
RST 5
Output Reset signal R0=220Ω
VCC 6 X Power 1.8V: (VCC=1.8V±2%)
3V: (VCC=3V±2%)