(g)
 DEU Addressing The coding switch in the DEU mount gives each DEU a different address. This method lets you remove, interchange and replace DEUs without the need to consider the address.

 1EFF : 001-049, 051-099, 101-105, 151-199, 1 23-73-00Page 79 1201-299, 1Config-1 Aug 01/05R 1 1 1CES 1

 C. Forward Attendant Panel
 (1) Description
 (Ref. Fig. 025)

 (a)
 General The forward attendant panel 120RH is installed in the forward entrance area of the aircraft. The attendant controls the different cabin systems from the attendant panel.

 (b)
 The Forward Attendant Panel performs these functions:

 -adaption of signals received on the ARINC data bus links from each CIDS director,
 -
processing of addressed commands and controls,

 -
processing of inputs from cabin systems,

 -
processing of inputs from the membrane switches on the front face of the FWD ATTND panel,

 -transmission of data at assigned intervals via the ARINC data bus between the panel and both directors,
 -fail-passive for data bus transmission and reception in the event of FWD ATTND panel failure,
 -short-circuit protection of all discrete outputs,
 -BITE functions for detection and location of faults which occur in the panel.

 (c)
 Architecture The FWD ATTND panel is in modular form with a master circuit board and sub-panels which connect to the master board. The visible part of the panel consists of colored membrane switches and indicator lights in a common grid pattern. Blank face-plates replace unused sub-panels.

 (d)
 Master Board The master board contains all parts which are common to all configurations of the FWD ATTND panel. This includes the power supply, ARINC 429 transmitter and ARINC 429 receiver.

 (e)
 Light Module

 **ON A/C 001-049, 101-105,
 (Ref. Fig. 026)
 1EFF : 001-049, 051-099, 101-105, 151-199, 1 23-73-00Page 80 1201-299, 1Config-1 Aug 01/05R 1 1 1CES 1

 Connections to the Forward Attendant Panel.
 Figure 025

 1EFF : 001-049, 051-099, 101-105, 151-199, 1 23-73-00Page 81 1201-299, 1Config-1 Aug 01/05R 1 1 1CES 1

 Light Module Figure 026 
R 1EFF : 1 1 1CES  001-049, 101-105,  1 111 Page 8223-73-00 Config-1 May 01/05

 **ON A/C 051-099,
 (Ref. Fig. 026A) **ON A/C 151-199,
 (Ref. Fig. 026B) **ON A/C 201-210,
 (Ref. Fig. 026C) **ON A/C 211-299,
 (Ref. Fig. 026D) **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 1_ MAIN OFF
 The MAIN OFF membrane switch, switches off the following
 systems:
 - general illumination in the cabin and the entrance areas,
 - reading lights,
 - attendant work light,
 - lavatory light,
 The function MAIN OFF is disabled in flight.
 2_ MAIN ON
 The MAIN ON membrane switch, switches on the general
 illumination in the cabin and entrance areas with a brightness
 of 100%. The integral light in the membrane switches BRT, WDO,
 and CLG comes on. If a membrane switch for the cabin or entry
 area is already pressed the MAIN ON membrane switch has no
 effect for the respective area. 

R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 23-73-00Page 83 1201-299, 1Config-1 Aug 01/05 1 1 1CES 1

 Light Module
 Figure 026A 
R 1EFF :  051-099,  1  23-73-00 Page 84 
1  1  Config-1 Aug 01/05
 1  1
 1CES  1

 Light Module
 Figure 026B 
R 1EFF :  151-199,  1  23-73-00 Page 85 
1  1  Config-1 Aug 01/05
 1  1
 1CES  1

 Light Module
 Figure 026C 
R 1EFF :  201-210,  1  23-73-00 Page 86 
1  1  Config-1 Aug 01/05
 1  1
 1CES  1

 Light Module
 Figure 026D 
R 1EFF :  211-299,  1  23-73-00 Page 87 
1  1  Config-1 Aug 01/05
 1  1
 1CES  1

 **ON A/C 001-049, 101-105, 201-210,

 3_ ENTRY BRT
 The ENTRY BRT membrane switch, switches on the general
 illumination in all entrance areas with a brightness of 100%.
 The integral light in the membrane switch comes on. Pushing
 the membrane switch a second time, switches off the general
　
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