Fiber Optic Interfaces
The MAT communicates with the CMCF in the AIMS cabinets through two fiber optic interfaces. The fiber optics interfaces supply a dual connection to the avionics local area network (AVLAN). These interfaces and the AVLAN are part of the onboard local area network (OLAN). The MAT connects directly to the AVLAN. The PMAT and the PMAT receptacles connect to a brouter. The brouter performs a network bridging function.
Primary Display System Interface
The CMCF gets fault reports from systems and records this information in a fault history. The primary display system (PDS) shows failure conditions in the form of flight deck effects (FDEs). The primary display function in the AIMS cabinets sends FDEs to the CMCF. The CMCF correlates faults to PDS failure indications.
These are the types of FDEs:
*
EICAS messages

*
PFD flags

*
ND flags

*
EICAS snapshots

*
Scheduled maintenance tasks

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CMCS -GENERAL DESCRIPTION

* Other display features.

The CMCS lets the maintenance personnel look at faults and correlated FDEs based on flight phases and flight legs.
Ground Test Switch Interface

The GROUND TEST switch on the ground test panel permits certain CMCS ground tests, data loads and special functions. It also provides power to the PMAT in the MEC.
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CMCS -GENERAL DESCRIPTION

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CMCS -COMPONENT LOCATIONS

Flight Deck

The maintenance access terminal (MAT) is on the P18 panel. The MAT keyboard is on the P18 panel in front of the MAT. The portable maintenance access terminaL (PMAT) receptacle
is on the left side of the MAT on the P18 panel.
The GROUND TEST switch is on the P61 overhead maintenance
panel.

Main Equipment Center

The left AIMS cabinet is on the E3-1 shelf. The right AIMS
cabinet is on the E2-1 shelf.
The PMAT is on top of the E-4 rack.
The PMAT receptacle is between the E-3 and E-4 racks.

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CMCS -COMPONENT LOCATIONS

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CMCS -PMAT RECEPTACLE LOCATIONS -1

Flight Deck

A PMAT receptacle is on the left side of the MAT on the P18 MAT/second observer panel.
Nose Wheel Well

A PMAT receptacle is on the right side of the P40 service and APU shutdown panel.
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CMCS -PMAT RECEPTACLE LOCATIONS -1

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CMCS -PMAT RECEPTACLE LOCATIONS -2

Main Wheel Well

A PMAT receptacle is on the P56 main wheel well electrical service panel.
Stabilizer Jack Screw Access Door

A PMAT receptacle is inside of the stabilizer jack screw access door.
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CMCS -PMAT RECEPTACLE LOCATIONS -2

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CMCS -MAT INTERNAL INTERFACES

Power

The MAT cursor control power supply module receives 115v ac power from the R MAIN SEC 2 AC BUS. The MAT cursor control power supply module supplies 115v ac power to the:
*
MAT dual disk drive module

*
MAT display module.

Small Computer System Interface

The MAT display module supplies a small computer system interface (SCSI) connection to the:
*
MAT cursor control power supply module

*
MAT dual disk drive module.

Maintenance Terminal Function

The MAT display module contains the maintenance terminal function (MTF) software that operates the MAT. You can load the MTF software.
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CMCS -MAT INTERNAL INTERFACES

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