User's Guide

DRAFT
Page 4-9
17 Mar 2016
23-15-87
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ARINC 781-500 SDU and SCM
© Honeywell International Inc. Do not copy without express permission of Honeywell.
B. SATCOM System Bus
The SATCOM SYSTEM BUS menu provides information about the bus status of equipment outside
the A781-500 system. SATCOM services are not available if the equipment does not operate or
communicate properly.
To check the bus status, on the SATCOM BITE menu, press the button next to SYS BUS.
Figure 4-3 illustrates the SATCOM System Bus menu.
Table 4-10 SATCOM Subsystem Health Menu
Label Description Action
LNA Reports the status of the LNA as OK, NO DATA (if
golden label 350 from the antenna is missing or
HGA is disconnected), TEST, or FAULT. The LNA
status matches the HDA status.
If the status is NO DATA, check
the bus connections from the
Antenna and check the speed of
bus.
If the status is FAULT, test or
troubleshoot the LNA equipment.
ANT Reports the status of the HGA as OK, FAULT,
TEST, or NO DATA.
If the status is FAULT, test or
troubleshoot the HGA equipment.
If the status is NO DATA check the
ARINC 429 bus from the Antenna.
FMPA Reports the status of the FMPA as OK, FAULT, NO
DATA, or NONE. If there is no FMPA configured,
the reported status is NONE.
If the status is FAULT, return the
FMPA to RC, the equipment
supplier. If the status is NO DATA
check the cable to the FMPA.
CONFIG
PARITY
Reports the status of the rear connector
configuration parity as OK (parity is odd) or FAULT
(parity is not odd). This status can be different from
the setting of Bit 25 in Label 350 to the CMC, which
is also set if the secure ORT is missing or invalid.
If the status is FAULT, check
strapping—a non-supported
configuration may be strapped.
DRAFT as of
4 Mar 2016