Sierra Wireless AirPrime SL808 Series Product Technical Specification & Customer Design Manuallines page 67

Rev 1 Dec.10 Proprietary and Confidential - Specifications subject to change
2. Wait at least 50 ms, then assert POWER_ON_N (active low) for at least
400 ms to turn on the module.
3. Release the POWER_ON_N signal (module has internal pull-up to 2.6 V).
Module is now in the 'on' (normal) power state.
To power off the modem, the host must:
1. Drive the signal low for at least 500 ms in order to initiate the power-down
sequence, and then release it. (The modem continually monitors
POWER_ON_N.)
The module should now be in the 'off' power state.
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