CIDS Bus Interface The CIDS bus interface handles all communication between the director and DEUs. Top-line data busses used for DEUs A, and middle-line data busses for DEUs B. Four top lines and two middle lines are provided. One bus protocol is defined for each line type, for example one protocol for the top lines and another for the middle lines. Each protocol allows the director to transmit data to the connected DEUs and to receive data from the DEUs. The respective bus protocol handles all digitized audio signals, control data and commands to the DEUs. Coded addresses are also included which permit the director to address the DEUs individually. The contents of data depends on the respective inputs and outputs and on a
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 zoning table stored in the director. The bus interfaces tests each connected bus line for breaks.
Power Supply The power unit derives all necessary internal supply voltages from the 28 V DC essential and service bus inputs.
Microcomputer and OBRM Under control of its high-performance microprocessor, the microcomputer performs these functions:
 -
the collection of discrete CIDS data bus information,

 -
the generation of discrete information to be transferred via the CIDS data bus,

 -
the monitoring of CIDS data bus connection,

 -
the c ontrol of chime, telephone tone and evacuation tone-generators,

 -
the collection and processing of discrete input information,

 -
the control of discrete output information,

 -
the communication with equipment connected via the serial interfaces,

 -
the built-in test function check,

 -
the BITE operation.
 Fundamental director control software and data tables,
 including back-up layout and system properties information,
 are permanently stored in the processing module. It allows a
 basic, limited operation of CIDS in the absence of the CAM.
 The Onboard Replaceable Module (OBRM) compliments this
 permanently stored data. The OBRM is a solid-state memory
 module and plugs into the front of the director.

 The software routines which makes the CIDS (and some parts of the director-control software) function, are stored in the OBRM. Installation of a different OBRM updates these software routines. The details of the aircraft cabin layout and of the system properties (chimes used, etc.) are permanently stored in the Cabin Assignment Module (CAM). This plugs into the front of the programming and test panel. The director copies the CAM data into a semi-permanent (electrically-erasable) memory during system initialization. It is termed the 'zoning table'. Once copied, the zoning table remains in the processing module memory until the next 'copy' from the CAM is loaded . A similar type of director memory is assigned as the CIDS 'BITE memory'. CIDS components and connected system faults are stored in the BITE memory for reporting to the aircraft CFDS when requested.
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 In addition to providing the regular CIDS system functions, the processing module implements monitoring of:
 -
the director operation,

 -
the operation of connected systems and components,

 -
the data bus performance,

 -
the BITE status of the other director.

 (2) Operation
 **ON A/C 001-049, 051-099, 101-105, 151-199,
 (Ref. Fig. 016)
 **ON A/C 201-299,
 (Ref. Fig. 016A)
 **ON A/C 001-049, 101-105, 151-199,
 (Ref. Fig. 017)
 **ON A/C 051-099,
 (Ref. Fig. 017A)
 **ON A/C 201-299,
 (Ref. Fig. 017B)
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-299,
 (a) Initialization Two identical directors 101RH and 102RH are installed in the avionics compartment. An identical OBRM, 101RH1 and 102RH1 respectively, plugs into each director. Each director has a dedicated ARINC transmission link to the other, for cross checking of each others BITE status. With the exception of the dedicated ARINC links, they are connected in parallel as shown below:
 -most of the ARINC 429 links,
 -the power supply lines,
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 -
all inputs and outputs of the two directors.
 The power connections are arranged such that director 1 is
 normally fully active and in control of the CIDS. Director 2 is
　
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