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 service interphone jacks.
 If the link is not automatically made (e.g. A/C on jacks), you
 can set the link manually, when you press the service interphone
 override switch. In case of manual set of the link, the status is
 indicated by a service interphone indicator light in the cockpit.
 (c) Service interphone from interphone jacks
 When the link is made, the audio signals are transmitted from the
 interphone jacks to the director. The director sends the signals
 to the cockpit handset, to the AMU and through DEU type B to the
 cabin handsets. The AMU sends the signals to the cockpit boomset.
 (d) Service interphone from cockpit equipment
 The service interphone function from cockpit boomset is activated
 at the Audio Control Panel (ACP).
 The audio signals are transmitted from the cockpit boomset
 through AMU to the director. The director sends the signals to
 the interphone jacks, to the cockpit handset and through DEU type
 B to the cabin handsets.
 For a detailed description of the AMU and ACP handling see Audio
 Management (Ref. 23-51-00).
 (e) Service interphone from handsets
 After dialling the related code on the cabin handset, the audio 
R  signals are transmitted via DEU type B to the director. The 
R  director sends the signals to the service interphone jacks, via 
R  AMU to the cockpit boomset and via DEU type B to the cabin
 handsets.
 (f) Reset of service interphone link
 The link between ground-crew boomsets and handsets is cancelled 
R  when the handset is put back on the cradle.
 The link between ground-crew boomsets and director is cancelled
 when the service interphone system becomes inactive.
 (g) Service interphone indications 
R  As long as a ground-crew boomset is connected to the system, you 
R  see the message'SERVICE INTPH AVAIL' on all assigned AIPs. 

R 1EFF : 106-149, 301-399, 401-499, 1 23-73-00Page A7 1 1 Config-2 Aug 01/05 1 1 1CES 1

 **ON A/C 301-399,

 (5)
 Prerecorded Announcement and Boarding Music (PRAM) System (Ref. Fig. 035)

 (a)
 General The CIDS transmits the prerecorded announcements and the boarding music to all passenger related loudspeakers. (Ref. 23-32-00)

 (b)
 Selection of prerecorded announcement and boarding music (Ref. Fig. 036A) From the AUDIO page of the FAP the prerecorded announcement function and the boarding music function can be remotely controlled.

 (c)
 Sources and signal transmission The source for the prerecorded announcements and the boarding music is the PRAM. The audio signals are transmitted from the sources via the director to the DEU type A. The DEU type A sends the audio signal either directly or via PISA to the loudspeakers.

 (d)
 Gain adjustment In case of low cabin-pressure or engine on (high oil-pressure) the volume of prerecorded announcement is increased.

 

 (6)
 In-Flight Entertainment system (IFE) (Ref. Fig. 037)

 (a)
 General The CIDS director transmits system information and PA related announcements from and to the IFE system. (Ref. 23-33-00), (Ref. 23-36-00).

 (b)
 Signal transmission The IFE interface receives system information and PA related audio signals from the CIDS director. The IFE additionally sends system information to the director. CIDS transmits the following system information to the IFE:

 -
Activation/deactivation of PAX calls,

 -
Activation/deactivation of NS/PED, FSB and RTS signs,

 

 

 -Layout data,
 -Illumination data,
 -Landing gear down and compressed,
R 1EFF : 301-399, 1 23-73-00Page A8 1 1 Config-2 Aug 01/05 1 1 1CES 1

 Prerecorded Announcement and Boarding Music with external PRAM - Block Diagram

 Figure 035 
R 1EFF :  301-399,  1  23-73-00 Page A9 
1  1  Config-2 Aug 01/05
 1  1
 1CES  1

 

 FAP - Audio Page with integrated PRAM (only PRAM related buttons labeled) -
Example
 Figure 036 
R 1EFF :  106-149,  1  23-73-00 Page A10 
1  1  Config-2 Aug 01/05
 1  1
 1CES  1

 

 FAP - Audio Page with integrated PRAM (only PRAM related buttons labeled) -
Example
 Figure 036A
 1EFF :  301-399,  1  23-73-00 Page A11 
　
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