University of Kansas
The call drop pattern
Increased number of call drops in Iridium-Iridium mode
The average time interval between call drops reduced from 100 minutes in case of 4 Iridium-4 PSTN system to 60 minutes in case of 8 Iridium – 8 Iridium DAV system.
Varies with time and weather
Increased call drops in presence of strong radio interference
Modem firmware failures
random modem lock ups due to bug in firmware.
Newer firmware upgrades reduced the number of such lock ups
Primary modem failure
No longer drops all the modems
Just the one modem is lost
System operates with remaining 7 modems