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3.1
MODES OF OPERATION
3.1.1
Power Up
At power up, the unit does a quick checksum test on the EEPROM. If the test passes, the unit
then initializes various devices and configures itself according to the EEPROM settings. It then
waits for the receiver board to complete its power up tests, which takes about 10 seconds. If the
receiver board passes its test, the IRD sends a tune request to the receiver board and the
Welcome Banner to the serial port. The IRD then enters alarm mode until all of the alarm
conditions are cleared.
Also, while in power up mode, each of the Unity 4000's LED's will FLASH (See Table 3-1,
page 3-2.).
3.1.2
Boot Fail
If any of the boot fail conditions occur, the unit will enter "boot fail" mode. While in this mode,
the unit is essentially dead. All audio and video is muted, the alarm relay is closed, the general
purpose relays are all open, and the unit does not attempt carrier acquisitions, etc.
3.1.3
Alarm, Warning, & Normal
See Sections 3.2.7 and 3.2.8 for a complete list of alarm/warning conditions and for information
on the LED's during these modes. The overall behavior of the IRD is very similar for any of
these modes, and the following is a list of their differences:
• Alarm and User Relays. See sections 3.2 and 3.3 for details.
•
Video is alarm frozen if No MPEG Data for less than 5 seconds, No Video for less than 5
seconds, or in fade mode for less than 10 seconds.
• Video is muted for all alarm conditions except Alarming Eb/No.
• Audio is muted for all alarm conditions except Alarming Eb/No and No Video Data.
• LED's are unique for each of these modes.
3.2
LED & ALARM / WARNING CONDITIONS
The following definitions apply throughout this section:
SECTION 3
OPERATION
3-1
UTY4000-003
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