(2) Cabin and flight crew interphone system
 (a)
 General The cabin and flight crew interphone system allows the telephone communication between all attendant stations and the cockpit. One or more links can be started at the same time. In conference mode the communication is possible between more than two interphone stations.

 (b)
 Interphone functions from cockpit From the cockpit an interphone communication is started with the handset, with the Cockpit Call Panel or with the equipment connected to the Audio Management Unit (boomset, microphone and oxygen mask). The audio signal is transmitted from the handset or from the Cockpit Call Panel directly to the director. The audio signal from the equipment connected to the AMU is transmitted through the AMU to the director. The audio signal is transmitted from the director to the handset of the selected attendant station through the related DEU type B. For a detailed description of the AMU handling see Audio Management (Ref. 23-51-00).

 **ON A/C 301-399,
 (3) Cabin and flight crew interphone system
 (Ref. Fig. 033)

 (a)
 General The cabin and flight crew interphone system allows the telephone communication between all attendant stations and the cockpit. One or more links can be started at the same time. In conference mode the communication is possible between more than two interphone stations.

 (b)
 Interphone functions from cockpit From the cockpit an interphone communication is started with the Cockpit Call Panel or with the equipment connected to the Audio Management Unit (boomset, microphone and oxygen mask). The audio signal is transmitted from the Cockpit Call Panel directly to the director. The audio signal from the equipment connected to the AMU is transmitted through the AMU to the director. The audio signal is transmitted from the director to the handset of the selected attendant station through the related DEU type B.

R 1EFF : 106-149, 301-399, 401-499, 1 23-73-00Page A0 1 1 Config-2 Aug 01/05 1 1 1CES 1

 Cabin and Flight Crew Interphone - Block Diagram
 Figure 033

R 1EFF : 301-399, 1 23-73-00Page A1 1 1 Config-2 Aug 01/05 1 1 1CES 1 For a detailed description of the AMU handling see Audio Management (Ref. 23-51-00).

R **ON A/C 106-149, 401-499,
 These functions are available on the call panel by function keys:
 -EMER call: If you push the EMER button, it starts an interphone connection between the cockpit and all attendant stations in the cabin.
 -ALL call: If you push the ALL button, it starts an interphone connection between the cockpit and all attendant stations in the cabin.
 -FWD attnd call: If you push the FWD button, it starts an interphone connection between the cockpit and the fwd attendant station in the cabin.
 -AFT attnd call: If you push the AFT button, it starts an interphone connection between the cockpit and the aft attendant station in the cabin.
 **ON A/C 301-399,
 These functions are available on the call panel by function keys:
 -EMER call: If you push the EMER button, it starts an interphone connection between the cockpit and all attendant stations in the cabin.
 -ALL call: If you push the ALL button, it starts an interphone connection between the cockpit and all attendant stations in the cabin.
 -FWD attnd call: If you push the FWD button, it starts an interphone connection between the cockpit and the fwd attendant station in the cabin.
 -MID attnd call: If you push the MID button, it starts an interphone connection between the cockpit and the mid attendant station in the cabin.
 -EXIT attnd call: If you push the EXIT button, it starts an interphone connection between the cockpit and the exit attendant station in the cabin.
 -AFT attnd call: If you push the AFT button, it starts an interphone connection between the cockpit and the aft attendant station in the cabin.
R 1EFF : 106-149, 301-399, 401-499, 1 23-73-00Page A2 1 1 Config-2 Aug 01/05 1 1 1CES 1R **ON A/C 106-149, 301-399, 401-499,

 (c) Interphone functions from cabin During an interphone connection the audio signals are transmitted from the cabin handset through the DEU type B to the director. The connection is started by the keypad on the handset.

R **ON A/C 106-149, 401-499,
 These functions are available on the cabin handset by function keys:
 -EMER CALL: If you push the EMER CALL button, it starts an interphone connection between the calling station and the cockpit.
 -Cockpit call: If you push the CAPT button, it starts an interphone connection between the calling station and the cockpit.
 -ALL attnd call: If you push the INTPH button followed by the ALL button, this starts an interphone connection between all attendant stations in the cabin.
　
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