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 **ON A/C 001-049, 051-099, 101-105, 201-299,
 (d) PA Announcements from Attendant Handsets (Ref. Fig. 038) An attendant handset is mounted at each attendant station. An AIP is installed near to each handset for display of PA-use information. When the handset is lifted a 440 Hz tone is heard. The top line of the AIP displays a number symbol. When the 'PA ALL' key is pressed a confirmation message is displayed on the AIP. If the PA call is impossible due to the priority of a call already in progress, then the word BUSY appears on the AIP display. To press the keypad RESET key always clears any handset operation and lets you make a new key selection.
 **ON A/C 151-199,
 (d) PA Announcements from Attendant Handsets (Ref. Fig. 038) An attendant handset is mounted at each attendant station. An AIP is installed near to each handset for display of PA-use information. When the handset is lifted a 400 Hz tone is heard. The top line of the AIP displays a number symbol. When the PTT key is pressed (direct PA function) or the 'PA' and 'ALL' pushbutton and PTT keys are pressed a confirmation message is displayed on the AIP. If the PA call is impossible due to the priority of a call already in progress, then the word BUSY appears on the AIP display. To press the keypad RESET key always clears any handset operation and new key selection.
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 The numbers of all selectable PA zones, for example 3, and the respective keypad keys, are stored in the CAM. The CAM also contains a priority list which is divided into priority levels. It starts with:
 -
the flight compartment as the highest priority,

 -
the attendant stations,

 -
the prerecorded announcement system,

 -
the entertainment PA sources.

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 Attendant Indication Panel - PA Selection Messages
 Figure 038

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 Once a PA call is established, the bottom line of all AIPs displays the respective PA IN USE message. Flight compartment PA IN USE indicator is provided as an option. Pressing the PTT switch keys the PA system. Sidetone audio is fed to the handset earpiece. When the PA announcement is over, you can disconnect the handset from the PA system as follows:
 -put the handset into the cradle or
 -press the RESET button.
 C. Cabin and Flight Crew Interphone System
 (1) Interphone System Architecture (Ref. Fig. 039) The components, interfaces and signal sources of the CIDS which are related to the interphone are as follows:
 (a)
 Flight Compartment
 The main interphone components are:

 -
the audio control panels,

 -
the flight compartment boomset,

 -
the oxygen mask microphones,

 -
the call panel with the call-buttons and integrated emergency call indicator,

 -
the crew call buzzer for audible call indications (through FWC),

 -
the flight compartment handset. The audio control panels, the flight compartment boomset and the oxygen mask microphones interface with the director through the Audio Management Unit (AMU). The call panel is connected directly to the directors. The crew call buzzer has an interface with the directors through the Flight Warning Computer (FWC).

 (b)
 Avionics Compartment
 The main interphone components are:

 -
the audio management unit,

 -
the link to CFDS,

 -
the two CIDS directors.
 Additional signal sources are:

 -
the oil pressure switch,

 -
the cabin pressure switch.

 (c)
 Cabin Each attendant station is connected to one DEU B. It interfaces with the CIDS director through one of two middle line data buses. The loudspeakers are connected to the DEUs A.

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 Interphone System Architecture .
 Figure 039

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 (2)
 System Description The CIDS director accepts audio signals from the various interphone sources in the aircraft and assigns priorities to each source. The director performs telephone exchange switching and call functions from flight compartment call switch settings or the attendant handset keypad entries. All this is done with reference to the parameters defined in the CAM. Chimes are transmitted via the top line data bus and the PA loudspeakers. In the flight compartment, integral lamps in the call switches annunciate interphone calls. In the cabin, the ACPs and AIPs are used for annunciation.
　
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