User's Manual

Table Of Contents

Installation_________________________________________________ Boomer II User Manual & Integrator’s Guide

Power Down Diagram Callouts

1 HOSTPWR_ON is de-asserted from the host/terminal to the

modem.

Important: The power rail must be present for up to ten seconds

(typically two seconds) after HOSTPWR_ON is de-asserted for the

deregistration process to complete orderly.

2 The modem starts the soft shutdown process. The battery status

indicator pulses quickly until the shutdown steps are complete.

The modem initiates the deregistration process from the network

and upon completion de-asserts DSR and DCD. DCD signifies

network detachment, and DSR shows the modem’s readiness state.

3 After deregistration, the internal modem CPU power-on signal is de-

asserted. This deactivates the internal modem power rail to the

radio.

4 At this point you can optionally de-asset HOSTPWR_ON signal to

the modem and assert the HCRESET line to the modem.