(5)
 ARINC 429 Input Data Port (Ref. Fig. 006) This port receives the CIDS data for the electrical location of seats (PA override and movie/video audio). All the necessary data is stored in the Cabin Assignment Module (CAM). The CAM is included in the PTP.

 (6)
 MPES Data Lines (Ref. Fig. 007) The MM controls two columns of seats on the aircraft. There are two data busses in each column. When one is used for the multiplexed digital audio, the other is used for service data.

 (7)
 Main Multiplexer Power Supply The aircraft electrical system supplies 115VAC (400 Hz) power to the Main Multiplexer (MM) 8MK. The transformer in the MM changes this voltage into DC voltage for the MM digital and analog circuits.

 (8)
 Audio Processing Each audio input has an input circuitry with a Low Pass Filter (LPF) and an analog switch. This circuitry is used to modify the audio signals and prepare it for the analog-to-digital conversion process. A timing base Large Scale Intergrated (LSI) circuit controls this process in the MM. This circuit establishes the system timing (controlled with a crystal controlled clock) and the multiplex channel timing for the insertion of digitalized audio signals into the correct channel.

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 C. Wall Disconnect Box (Ref. Fig. 009, 010) The Wall Disconnect Box (WDB) 50MK gives a disconnect point for the data busses of the MPES. It supplies line amplification for the data busses. The busses from the MM are fed to the WDBs on each side of the aircraft. A WDB termination last plug is connected to the J1/J4 connector. Two other connectors on the WDB (J2 and J3) are used to supply the data busses to the seat groups (forward and aft of the WDB location).
 D. Seat Electronic Box (Ref. Fig. 011, 012) The Seat Electronic Box (SEB) 100MK is installed on the seat-leg mounting bracket with nylatch fasteners. Electrical connections to the SEB from the MM are made through the WDB. J1 and J2 are the databus input/output connectors. Seat to seat cables (or the WDB to the SEB cables) are connected to these inputs/outputs. Interface connections from the SEB to the PCUs are made through J3. All the connectors on the SEB are 'D' subminiature types. The SEB 100MK supplies 5VDC power to the PCUs 200MK and 201MK in the seat group it controls.
 (1) Multiplex Passenger Entertainment System Audio Processing The input line receiver processes the PES data then supplies it through a decoder to the timing base Large Scale Integrated (LSI) circuit. The microprocessor processes the digital data and reassembles the analog audio signal with the digital-to-analog converter. When a passenger selects a channel, the SEB 100MK receives the digital number from the PCU and the digital audio signal from the MM. The SEB 100MK converts this into an analog audio signal. The analog signal is then put through a filter to the PCU acoustic transducer or the electrical jacks. For each transducer, a seperate digital-to-analog converter, a volume control circuit and a filter are provided in the PCU.
 E. Passenger Control Unit
R **ON A/C 051-099,
 (Ref. Fig. 013)
R **ON A/C 201-210,
R (Ref. Fig. 013B)
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 Wall Disconnect Box (WDB)
 Figure 009

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 Wall Disconnect Box (WDB)
 Figure 009A

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 Wall Disconnect Box (WDB) Block Diagram
 Figure 010

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 Wall Disconnect Box Electrical Interface
 Figure 010A

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 Seat Electronic Box (SEB)
 Figure 011

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 Seat Electronic Box Figure 011A 
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 Seat Electronic Box (SEB) Electrical Interface
 Figure 012

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1

 Seat Electronic Box Electrical Interface
 Figure 012A

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R  Passenger Control Unit (PCU) 
R  Figure 013 
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 Passenger Control Unit (PCU)
 Figure 013A
　
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