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3.1
MODES OF OPERATION
This UNITY4000 has the capability of operating as an Audio-Only Integrated Receiver Decoder.
It can also receive and process video signals, but is not normally used this way. The Audio-Only
capability is accomplished by setting a software flag at the factory. This being the case, unit
specifications are not changed from one mode to the other, but menus and displays are presented
differently from those in an Audio-Visual UNITY4000 to accommodate this duality.
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 boot up. When the receiver board completes its boot
up, 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. All of this takes
about 25 seconds.
Also, while in power up mode, each of the Unity 4000Õs LEDÕs will FLASH (See Table 13,
Page 30.).
3.1.2
Boot Fail
If any of the boot fail conditions occur, the unit will enter Òboot failÓ 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
(Page 31) and
and for information on the LEDÕs 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
•
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.
SECTION 3
OPERATION
3.2.8
(Page 32) for a complete list of alarm/warning conditions
3.2
(Page 30) and
Page 29 of 77
3.3
(Page 32) for details.
UTY4000-003
Page 29
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