Main Multiplexer (MM)
Figure 015
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AUDIO REPRODUCER Figure 016
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(2) Control Elements
The CD A/R itself has the subsequent operation controls:
-
a monitor jacks (monaural headset) for sound check,
-
a channel up and down pushbutton for channel selection,
-
a volume up and down pushbutton for volume selection,
-
a two-digit channel number display,
-four disk drive diaplays.
C. Wall Disconnect Box (Ref. Fig. 009A, 010A)
(1)
General The function of the Wall disconnect Box (WDB) 50MK is to provide interface, power and communication, between the MM and Seat Electronics Boxes (SEB) 100MK.
(2)
Functionality
WDB provides the following functionality:
-pass through of PCM data from an upstream WDB or MM to a downstream WDB,
-distribution of PCM data from an upstream WDB or MM to locally connected SEB chain,
-
passive interconnection of adress token signals to locally connected SEB as well as upstream and downstream WDB,
-
passive interconnection of uplink data from local SEB chains to upstream WDB,
-distribution of 115V power to downstream WDB and locally connected SEB. The last WDB in a column is connected at its downstream output with a termination plug.
D. Seat Electronic Box (Ref. Fig. 011A, 012A)
(1)
General The SEB only changes the digital signals of the passenger selected channel back to the original analog form. These signals are transmitted to the PCU. Each SEB supplies up to 3 PCU.
(2)
Transmission from/to SEB
The SEB transmits:
-
the 3,3VDC to the PCU,
-
the 20V to the WDB,
-
the music signal to the PCU,
-
the video sound signal to the PCU.,
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E. Passenger Control Unit
(Ref. Fig. 013A)
(1)
General The Passenger Control Units (PCU) 200MK and 201MK are the primary interfaces between the passengers and the MPES. They are installed in the armrest of each passenger seat.
(2)
Control Elements
Each PCU has:
-a LED display (2 digit LED indicates the channel select),
-
Up/Down pushbutton switch (channel select),
-
Up/Down pushbutton switch (volume control),
-an electrical headset jack.
**ON A/C 301-399,
A. Main Multiplexer
(Ref. Fig. 007A, 015)
(1)
General The Main Multiplexer (MM) 8MK is installed in the avionic compartment. The MM has 25 total audio inputs. These inputs are:
-Sixteen audio inputs channels from the Audio Reproducer
-Six audio inputs channels from the PES Video System
-Three audio inputs channels from the Passenger Adress.
(2)
Function
The MM provides the following general functions:
-Multiplex of analog audio sources into a single PCM data stream that is distributed to SEB throughout the aircraft
-Decode and processing of 7 input keylines (3 Video/3 PA/1 PES test) for a maxium of 3 Video zones and 3 PA zones
-BITE processing and reporting via the CICS data bus
-Processing of the system configuration layout data from the CICS data bus. The MM supports followings methods of loading channel configuration and mapping tables:
-Encoded A/R audio disks
-PCU manual entry
-Serial maintenance port
-ARINC 485 interface to Sony PSCU.
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(3) Control Elements
The MM has these control elements:
-
A momentary switch to initiate Download and Bite
-
A green contol-LED to indicate the Power on
-An amber control-LED to indicate the status of the unit.
B. Compact Disk Audio Reproducer (Ref. Fig. 016)
(1)
General The CD Audio Reproducer (A/R) 10MK is installed in the avionic compartment. The CD A/R contains four identical CD decks, and are numbered "No.A" thru "No.D". Each deck drives one CD. Up to two stereophonic channels or four monophonic channels provides each CD drive. The CD A/R gives up to 16 different music programs, from CDs, to the Main Multiplexer.
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