Installation Manual Part 7

FCC ill: CDG-ARTU EXHIBff C
MAGNASTAR C-2000 DIGITAL AIRBORNE TELEPHONE SYSTEM
9.4 Handset Text Messages
The MagnaStar system provides infonnation screens that display text messages on the digital handset LCD
display if the radio detects certain types of operational problems. These text messages are intended to help
the user determine why a call may not be placed or why a call may have been interrupted and what possible
action to take to correct the problem
There are several handset text message that may be displayed indicating that the ARTU has
detected an abnonnal condition and has taken some type of corrective action. Typically the
corrective action taken is that the ARTU will reload software. These types of handset text
messages normally indicate that the ARTU is not broken and does not need to be replaced. If the
problem reoccurs and cannot be cleared, then reboot the ARTU. This can be accomplished by
pulling the circuit breaker an removing power for greater than IS seconds. This infonnation
applies to the following three handset text message screens:
Channel -
Limited
To One
Call
Mode
switchover
Failure
Service
Recovery
Failure
Hang Up
All Calls
And Redial
To Acquire
Another
C~~J,--
h-Dial
Re-Dial
Two handset text messages are shown below that may be displayed if a telephone connection is
abnonnally tenninated. These messages do not nonnally indicated an aircraft system fault unless
repeated occurrence of this type of condition exists.
There are several reasons hand-off failures or abnormal call tenninations can occur. They may be
caused by poor radio link conditions, antenna blockage, radio frequency interference, base station
coverage problems because operation is below 18,000 feet, or ground network proble~. If an
aircraft is experiencing excessive call hand-off failures, then it is suggested to first check the RF
cabling and antenna installation on the aircraft. Check for damaged coaxial cables shields or loose
coaxial cable connectors, especially the SMA connectors on the duplexer.
Radio
Signal
Lost
Call
Handoff
Failure
Re-Dial
Re-Dial
RevB
9-32