Power Detect Indicator - Iridium EDGE User Manual

Iridium Edge's network status. If the Network Indicator function is not required, this pin should be left
disconnected.
Network Available is not a guarantee that a message can be successfully sent; instead it reports if it can
see an Iridium satellite by measuring the level of the incoming satellite channel. The Network Available
state is evaluated every time the satellite channel is received or missed. If the satellite channel is visible,
then the update interval is typically every 4 seconds. If the satellite is not currently visible, then the
update period can be as long as 2 minutes, depending on how long the lack of satellite visibility existed.
The duration increases during lack of satellite visibility as the SBD modem backs off its attempts to
conserve power by increasing the satellite channel search interval. Every time a satellite search fails, the
time to wait is increased and eventually limits at 120 seconds.
The specifications for the Network Indicator are listed in the table below. The Network Indicator is an
output and should not be driven by an external source.
Complete details on the Network Indicator behavior can be found in the documents listed in Section 2.3
Reference Documentation

3.5 Power Detect Indicator

The Iridium Edge's Power Detect (pin #8) indicator is RS232 compliant signal. The output specifications
for the Power Detect indicator are given in the table below.
Table 3-14 Network Available Output Specifications
Parameter
Active (Satellite in view)
Inactive ( No Satellites in view)
ESD Protection
Table 3-15 Power Detect Specifications
Parameter
Maximum Output Level
( when powered and ready)
Minimum Output level
( when powered but not ready)
ESD Discharge
Value
> 2.4 V
<0.5 V
15 kV
Value
6V +/- 0.5V
-6V +/- 0.5V
15 kV
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