Installation Manual Part 6

FCC ID: CDG-ARTU EXHIBIT C
MAGNASTAR C-2000 DIGITAL AIRBORNE TELEPHONE SYSTEM
9.1.3 START ARTU OPERATIONAL SOFTWARE
When the ARTU is powered up with an MMT connected, the ARTU software will not execute and will be
in what is termed a "boot" mode. When commanded by the MMT, the ARTU will start the operational
software. The first step in starting the operational is for the ARTU to run Built-In-Test (BIT). The normal
BIT process begins by turning "ON" the ARTU Fault indicator. The MMT will indicate that the ARTU has
started software execution which is displayed in the Radio Responses window. The ARTU then begins an
FEPROM test which takes approximately 15-20 seconds to complete. Owing this time there will be no new
messages displayed in the Radio Responses window. BIT test result information will be reported in the
Radio Responses window. Depending on how long the ARTU has been powered prior to executing power-
up BIT, the screen may pause in the middle of the tests. This pause is to allow the ARTU oscillator to
warm-up. This can take one to five minutes. After this pause, BIT will complete.
Symptom: Radio Responses window does not display test results.
If the Radio Responses window does not appear to change, the user should look to see if the red
Fault light is illuminated. If the red Fault light is not illuminated then press "R" to repeat the test.
Symptom: ARTU fails power-up BIT.
If the ARTU fails a BIT test, note which test has failed and replace the ARTU.
After power up BIT has completed, it is possible to review the BIT test data by sending the
following MMT commands:
Press "FI ", ; scrolls screen to commanded mode menus
press "2" and then press ENTER, ; selects Radio Test Menu
press "2" and then press ENTER, ; selects Commanded Bit Menu
press "0" and then press ENTER. ; selects view BIT results
Pressing "N" for next, or "P" for previous, will scroll the user through the BIT test results.
Symptom: ARTU appears to pause during BIT for longer than ten minutes.
BIT will begin testing and stop during the middle of the tests to wait for the OCXO frequency
reference to warm up. BIT testing will stop at the "QUERY AMX" test. Ifafter stopping at the
"QUERY AM)(" test, the MMT BIT test times out after ten minutes and the RED Fault indicator
is still illuminated, then the ARTU has faulted. Replace the ARTU and note that the ARTU has
failed for OCXO warm up.
Symptom: BIT test appears to repeat.
If the BIT test appears to be repeating over and over then one of two conditions is occurring. One,
the voltage at the ARTU is dropping below +20.5 volts DC during the power up BIT. Measure the
voltage at the radio interface with ARTU attached. If the voltage drops below +20.5 VDC, check
the gauge of wire used for the power cable to insure that it is of sufficient size to minimize the
voltage drop from the circuit breaker to the ARTU. The second condition is current limiting. If
the power system cannot support a 3-5 ampere current surge while maintaining a stable voltage
then the ARTU will repeat BIT.
9-3
RevB