-The Operating Diagram shows the control logic.
-
When this circuit is connected to the ground or supplied with a voltage of +3.5 V a logic 0 is obtained. This corresponds to circuit operation.
-
When the circuit is open or has a resistance greater than 50000 ohms a logic 1 is obtained. This corresponds to non operation of the circuit.
-The letter-frequency assignment table gives the letter-frequency
assignments.
Letter Frequency Assignment Table
-------------------------------------------------------------------------------| DESIGNATION | FREQUENCY | BCD CODE | -------------------------------------------------------------------------------| | | 8 4 2 1 | | A | 312.6 | 0 0 0 1 | | B | 346.7 | 0 0 1 0 | | C | 384.6 | 0 0 1 1 | | D | 426.6 | 0 1 0 0 | | E | 473.2 | 0 1 0 1 | | F | 524.8 | 0 1 1 0 | | G | 582.1 | 0 1 1 1 | | H | 645.7 | 1 0 0 0 |
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SELCAL Code Panel - FRONT Face Figure 012
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SELCAL Code Panel - Operation of Knurled Knobs Figure 013
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SELCAL Code Panel - Operating Diagram Figure 014
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-------------------------------------------------------------------------------| DESIGNATION | FREQUENCY | BCD CODE | -------------------------------------------------------------------------------| J | 716.1 | 1 0 0 1 | | K | 794.3 | 1 0 1 0 | | L | 881 | 1 0 1 1 | | M | 977.2 | 1 1 0 0 | | P | 1083.9 | 1 1 0 1 | | Q | 1202.3 | 1 1 1 0 | | R | 1333.5 | 1 1 1 1 | | S | 1479.1 | 0 0 0 0 | -------------------------------------------------------------------------------The SELCAL code panel does not require an electrical power supply.
C. Audio Management Unit
(1)
Purpose The Audio Management Unit (AMU) ensures the interface between the user (jack panel and ACP) and the various radio communication and radio navigation systems. The AMU ensures the following functions:
-Transmission
-Reception
-SELCAL and display of ground crew and Cabin Attendant calls
-Flight interphone
-Emergency function for the Captain and First Officer stations It also serves to record communications and is equipped with a TEST circuit (BITE). This TEST circuit enables the AMU to be connected to the CFDIU.
(2)
Mechanical description
R **ON A/C 106-149, 221-299, 301-399, 401-499,
(Ref. Fig. 015)
**ON A/C ALL
The AMU is in the form of a 4MCU size box in compliance with ARINC 600 Specifications.
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Audio Management Unit - External Unit
Figure 015
R 1EFF : 106-149, 221-299, 301-399, 401-499, 1 23-51-00Page 46 1 1 Aug 01/05 1 1 1CES 1
6. Operation
_________
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
(Ref. Fig. 016)
R **ON A/C 106-149, 221-299, 301-399, 401-499,
(Ref. Fig. 016A)
**ON A/C 001-049, 051-099, 101-105, 151-199, 201-220,
The AMU comprises 3 independent channels associated with the 3 ACPs. Each channel comprises :
-
Its reception function
-
Its transmission function
-
Its logic processing function
-
Its power supply.
The SELCAL, BITE and Flight Interphone sections are connected to the
different channels.
R **ON A/C 106-149, 221-299, 301-399, 401-499,
The basic AMU comprises 4 channels: CAPT, F/O, 3rd OCCPNT and avionics bay station (requires activation of a dedicated pin-programming). It can receive one additional channel for a 4th cockpit occupant.
**ON A/C ALL
A. Transmission Function
(1) General
The transmission function:
-Sets into service and supplies the various microphones used (boomset, hand microphone, oxygen mask microphone)
-Selects the transmitter selected by the operator by means of the ACP
-Ensures the emergency function (for transmission section)
1EFF : ALL 1 23-51-00Page 47 1 1 Aug 01/05 1 1 1CES 1
Audio Management Unit - Block Diagram
Figure 016
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 23-51-00Page 48 1201-220, 1May 01/05 1 1 1CES 1
Audio Management Unit - Block Diagram
Figure 016A
R 1EFF : 106-149, 221-299, 301-399, 401-499, 1 23-51-00Page 49 1 1 Aug 01/05 1 1 1CES 1R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-220, 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM Communications 通讯2(114)
