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SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
4. SCDU for Dual SATCOM
A. General
(1) The SDU supports SCDU page displays for dual systems. All pages are as specified
in paragraph 2.D. (SCDU pages) with the following exceptions.
B. SATCOM Logical Channels
(1) The SATCOM channels for HEADSET calls in a dual system can be supplied by
several combinations of physical channels within both SDUs. These combinations are
determined by the configuration strap settings for cockpit wiring and ORT items
regarding the use of SDU channel resources (items vi, vii, and xlviii). The display of
channel status and selections as reported on menus MAIN, DIRECTORY, and
CATEGORY-n reflect the logical channel status.
C. SATCOM (Cross-Talk Bus Failed)
(1) The SDU designated as the slave unit in a dual system must receive most of the
system status information from the master over the SDU cross-talk bus. If full
communication is not established, the slave unit cannot receive the necessary data
for the display pages. The default SATCOM MAIN MENU display page THIS UNIT
UNAVAILABLE is displayed in this case.
D. SATCOM
(1) The channel status page reflects the physical channels within the SDU that is
providing the display page.
E. SATCOM Menus
(1) The maintenance menus reflect the maintenance data for the SATCOM system that
is providing the display page.
5. Maintenance Panel Assembly
A. General
(1) The maintenance panel assembly interface diagram (Figure 5-17) supplies remote
monitoring of MCS system operation. The maintenance panel assembly is made up
of two parts: the cabin telecommunications (CTM) panel and the Commissioning and
Maintenance Terminal (CMT) panel. The CTM panel is used for monitoring the cabin
telecommunications equipment. The panel contains six lamps to indicate the
availability of the telephone handsets. A keyed on/off switch arms the system when
the key is turned to the ON position.
(2) The CMT panel is used primarily to debug, detect, isolate software and/or hardware
integration, LRU and system integration, formal testing, and system access approval,
as well as general performance analysis. The CMT data connector supplies an
access port for a commissioning and maintenance terminal that can be a personal
computer, a dumb terminal, or a modem. The SDU interface connector on the panel
supplies a remote access port for testing the SDU. The panel also contains lamps to
indicate the status of the MCS system. These lamps are defined in Table 6-22.
Honeywell International Inc. Do not copy without express permission of Honeywell.
MCS--4200/7200 Multi--Channel SATCOM System
23- -20- -35
Page 6--121
15 Jul 2006
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