R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 46-24-00Page 55 1401-499, 1Aug 01/05 1 1 1CES 1 NOTE : The ATSU router monitors the value of the remote port select

____ discrete sent by the RMPs for switching request detection.
 (3) Switching to Voice mode
 (Ref. Fig. 011)

 (a)
 When the switching is initiated from one RMP The vocal frequency to be used is sent directly by the RMP to the digital input port B of the VDR3.

 (b)
 When the switching is initiated from one MCDU The frequency selected on VHF3 VOICE DIRECTORY page, is sent by the ATSU to the digital input port A of the VDR3. The specific voice frequency can be:

 -selected from the list of 6 frequencies predefined and customizable by the AOCs (1L to 3L and 1R to 3R)
 -entered manually (in this case, the validity of the frequency is checked during the MCDU data entry) (5L)
 -specified in the last received COMPANY CALL message (label 54 uplink) (4L)
 NOTE : On reception of a COMPANY CALL message, the ATSU checks
____ the validity of the frequency proposed in the message.
 (c) If the VDR3 is in Data mode When the switching request is received, the ATSU router checks that VDR3 has switched to Voice mode after five seconds.
 NOTE : If the VDR3 has not switched to Voice mode, the 'VDR
____ switch impossible' message is displayed on the MCDU scratchpad.
 (d) If the VDR3 is already in Voice mode The ATSU router determines which equipment will control the VDR3 in Voice mode according to the origin of the switching request.
 NOTE : In both cases, the ATSU sends, to the VDR3, the order to
____ switch to Voice mode and to operate with the frequency transmitted by the system which requires the switching.
 **ON A/C 151-152, 201-203,
 (Ref. Fig. 005)
R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 46-24-00Page 56 1401-499, 1Aug 01/05 1 1 1CES 1

 ATIMS - RMP Switching from Data to Voice Mode
 Figure 011

R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 46-24-00Page 57 1401-499, 1Aug 01/05 1 1 1CES 1R **ON A/C 106-149, 151-156, 159-199, 201-299, 301-399, 401-499,

 Post SB 46-1009 For A/C 151-152,201-203,
 Post SB 46-1013 For A/C 151-156,201-209,
 (Ref. Fig. 005A)
 **ON A/C 151-158, 201-209,
 Post SB 46-1009 For A/C 151-152,201-203,
 (Ref. Fig. 005B)

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 (4) Switching to DATA mode
 (Ref. Fig. 012)

 (a)
 When the switching is initiated from one RMP The data frequency corresponds to the last frequency used in DATA mode.

 (b)
 When the switching is initiated from one MCDU The data frequency corresponds to the last frequency used in DATA mode if no new Service Provider has been selected on VHF3 DATA MODE page. The VHF3 DATA MODE page displays a menu of various regions which can be selected by the crew. Each region is associated with a DSP and a frequency. Only the DSPs entered in the scan mask are displayed on this page.

 **ON A/C 151-152, 201-203,
 (Ref. Fig. 005)

R **ON A/C 106-149, 151-156, 159-199, 201-299, 301-399, 401-499,
 Post SB 46-1009 For A/C 151-152,201-203,
 Post SB 46-1013 For A/C 151-156,201-209,

 (Ref. Fig. 005A)
R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 46-24-00Page 58 1401-499, 1Aug 01/05 1 1 1CES 1

 ATIMS - RMP Switching from Voice to Data Mode
 Figure 012

R 1EFF : 106-149, 151-199, 201-299, 301-399, 1 46-24-00Page 59 1401-499, 1Aug 01/05 1 1 1CES 1 **ON A/C 151-158, 201-209,

 Post SB 46-1009 For A/C 151-152,201-203,
 (Ref. Fig. 005B)

R **ON A/C 106-149, 151-199, 201-299, 301-399, 401-499,
 NOTE : In both cases, the ATSU router sends to the VDR3 the order
____ to switch to DATA mode and to use the frequency on the digital input port A. The ATSU router checks that the VDR3 has switched to DATA mode after five seconds. If not, the ATSU router displays the "VDR3 switch impossible" message in the MCDU scratchpad.
 **ON A/C 151-152, 201-203,
 (5) VHF frequency control (Ref. Fig. 009) The airline and the ATC ground centers can exchange data with the aircraft through ground networks called Service Providers. Since all the networks are interconnected, the data can be transferred over any network.
 (a)
 ARINC 618 acquisition methods

 -Manual: a service provider region is selected on VHF3 DATA MODE page
 -Scan mode: when no communication with the ground is established using the current service provider, the ATSU starts scanning the list of service providers selected in the VHF3 scan mask and displayed in the VHF3 DATA MODE page
　
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