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 VDL mode A function is present on an important number of aircraft using
 datalink communications. This function allows a 2400 bit/s throughput thanks
 to a MSK modulation.
 Once the dialogue between the VDR and the ATSU established (exchange
 protocol Williamsburg V3 initialized), the data exchanges between these two
 systems become possible in mode A.

 1EFF : ALL 1 23-12-00Page 1 1 1 Aug 01/05 1 1 1CES 1 **ON A/C ALL

 2. Component Location
__________________
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 001)

R **ON A/C 151-199, 401-499,
 (Ref. Fig. 001A)
 **ON A/C 301-399,
 (Ref. Fig. 001B)

R **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399, 401-499,
 (Ref. Fig. 002)
 **ON A/C 151-199,
 (Ref. Fig. 002A)
 **ON A/C ALL
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------1RC1 XCVR-VHF, 1 81VU 127 824 23-12-33 1RC2 XCVR-VHF, 2 82VU 128 824 23-12-33 1RC3 XCVR-VHF, 3 81VU 127 824 23-12-33 4RC1 ANTENNA-VHF, 1 224 23-12-11 4RC2 ANTENNA-VHF, 2 154 23-12-11 4RC3 ANTENNA-VHF, 3 254 23-12-11 3CA1 MCDU-1 11VU 211 831 22-82-12 3CA2 MCDU-2 11VU 211 831 22-82-12 1RG1 RMP-COM/NAV FREQ SEL, 1 11VU 211 831 23-13-13 1RG2 RMP-COM/NAV FREQ SEL, 2 11VU 211 831 23-13-13
 1EFF : ALL 1 23-12-00Page 2 1 1 Aug 01/05 1 1 1CES 1

 VHF System - Component Location - A320 A/C
 Figure 001

R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 23-12-00Page 3 1 1 May 01/05 1 1 1CES 1

 VHF System - Component Location
 Figure 001A

R 1EFF : 151-199, 401-499, 1 23-12-00Page 4 1 1 Aug 01/05 1 1 1CES 1

R  VHF System - Component Location 
R  Figure 001B 
R 1EFF :  301-399,  1  23-12-00 Page 5 
1  1  May 01/04
 1  1
 1CES  1

 

 VHF System - Component Location
 Figure 002

R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 23-12-00Page 6 1301-399, 401-499, 1Aug 01/05 1 1 1CES 1

 VHF System - Component Location
 Figure 002A 
R 1EFF :  151-199,  1  23-12-00 Page 7 
1  1  May 01/04
 1  1
 1CES  1

 

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------1RG3 RMP-COM FREQ SEL, 3 20VU 211 831 23-13-13
R 1EFF : ALL 1 23-12-00Page 8 1 1 May 01/04 1 1 1CES 1

 3. System Description
__________________
 **ON A/C 001-049, 051-061, 101-105,
 (Ref. Fig. 003)

R **ON A/C 062-099, 106-149, 151-199, 201-299, 301-399, 401-499,
 (Ref. Fig. 003A)

R **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399, 401-499,
 Each VHF system is composed of:
 -
A transceiver

 -
A blade antenna.
 The VHF system is associated with:

 

 -
The Radio Management Panels (RMP). These are centralized systems which enable the frequency display of the VHF system (Ref. 23-13).

 -
The Audio Management Unit (AMU) for connections to the audio integrating and SELCAL systems (Ref. 23-51)

 -
The Centralized Fault Display Interface Unit (CFDIU) (by the MCDU) which is a centralized maintenance system (Ref. 31-32)

 -
The Landing Gear Control and Interface Unit (LGCIU) which indicates the aircraft status (flight or ground) (Ref. 32-31)

 -
The System Data Acquisition Concentrator (SDAC) which collects
 transmission data from the VHF system (Ref. 31-54).

 

 **ON A/C 151-199,
 Each VHF system is composed of:
 -
A transceiver

 -
A blade antenna.
 Each system is associated with the following systems and components:

 

 -
The Radio Management Panels (RMP). These are centralized systems which enable the frequency/channel selection and display of the VHF system and provide voice/data switching function (Ref. 23-13).

 -
The Audio Management Unit (AMU) serves for connection to the audio integrating and SELCAL systems (Ref. 23-51). The ACPs through the AMU allow audio controls.

 -
The Centralized Fault Display Interface Unit (CFDIU) is a centralized maintenance system (Ref. 31-32).

　
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