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SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
2
For certain failures detected during continuous monitoring, the appropriate
discrete failure bits and the SSM FW state are set within the maintenance
and status words as long as the failure persists.
(3) HSU Failure Reporting
(a) General
1
The HSU reports its functional test/CM failure status by lighting its front
panel LEDs, and through communication to the SDU.
(b) HSU Front Panel Indicators and Controls
1
The HSU indicators and controls are given in Table 6-3.
Indicator/Control
PASS LED
FAIL LED
PUSH--TO--TEST (PTT)
(c) HSU Front Panel LEDs
1
Functional testing effectively controls the on/off state of the front panel LEDs
during the period beginning with initiation of the functional testing
(POST/PAST), through execution of the functional test sequences (including
LED testing), and up to and including the indication of the test results on the
LEDs. Continuous monitoring exclusively controls the LEDs at all other
times.
The green LED (PASS) lights for 30 ± 5 seconds at the conclusion of the
2
functional test sequences if both of the following are true:
• The HSU determines there are no currently active CM failures having its
• No functional test failures have been detected with its own Level I code.
3
There must be no known failures in order to light the green LED as the
functional test indication.
4
The red LED (FAIL) lights continuously during the functional test indication
phase and through the transition to the CM indication phase, if the HSU
detects at least one currently active CM failure with its own Level I code. If
the HSU detects only functional test failures (i.e., no CM failures are
currently active), the red LED lights for 30 ± 5 seconds and is then turned
off.
Honeywell International Inc. Do not copy without express permission of Honeywell.
MCS--4200/7200 Multi--Channel SATCOM System
Table 6-3. HSU Indicators/Controls
Shows green after a test, if no failures are detected in the HSU
Shows red after a test, if failures are detected in the HSU
Push this button to start a test of the HSU
own Level I code (i.e., 03)
Description
23- -20- -35
Page 6--10
15 Jul 2006
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