------------------------------------------------------------------------------| | SPEED | WIRED | PROCES| PROCES-| | | | (HIGH | TO | SED BY| SED BY | | | INPUT BUS | SPEED | DMC | DMC | DMC 3 | | | | LOW | No. | No. | WHEN | | | | SPEED) | | | TRANSFER | | | | | 1 2 3 | 1 2 3 | 3/1 3/2 | | |----------------------------------------------------------------------------| | FCDC 1| LS | X X X | X X X | X X | | | 2| " | X X X | X X X | X X | | |------------------|--------|-------|-------|----------|---------------------| | LGCIU 1| LS | X X X | X X X | X X | | | 2| " | X X X | X X X | X X | | |------------------|--------|-------|-------|----------|---------------------| | TCAS 1-1| HS | X X | X X | X X | | | 1-2| " | X | X | | |
TABLE 3
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C. Reconfiguration Possibilities in the EIS System Itself R (Ref. Fig. 052, 053)
(1) Link between the DMCs and the DUs: DSDL The PFD, ND, ECAM processing channels drive their associated DUs through a switching stage first, and then via dedicated links called DSDL (Dedicated Serial Data Link), Master and Feedback. In normal operation, the DMC1 drives the CAPT PFD, the CAPT ND and the upper ECAM DU through their normal input N, and the DMC2 drives the F/O PFD, the F/O ND and the lower ECAM DU also through their normal input N (the DMC 3 is in standby, ready to take over the DMC 1 or 2 in case of failure). In fact, each DU has two inputs for receiving the digital signals from the DMC dedicated buses (master DSDL), one normal input, N and one alternate input A. (This alternate input is used in some reconfiguration cases, following transfer controls as explained in the paragraphs 6.C.(2)(b) and (c) concerning DU failures). In turn, each DU sends back to its driving DMC digital signals through a dedicated bus which is called feedback DSDL. Through this feedback link, the DUs acknowledge proper reception of the DSDL master signals, and also inform the DMC of their detected failures, so that the DMC can make the proper action (for instance, automatic transfer of a PFD image on an ND in case of detected failure of the PFD).
NOTE : The connections between the DMC3 and the DUs are cross-wired
____ for the PFD and ND, in order to cope with a possible wire cut-off concerning the connection which delivers the PFD information. In this case, when the DMC3 supplies the PFD and the ND one side, CAPT or F/O, the DMC3 signals enter the PFD and the ND via their alternate inputs. The activation of the DU alternate inputs and the de-activation of the normal inputs is made by grounding a discrete input on the DU connector. This is achieved by an A/C circuitry which takes into account all the conditions leading to the change of inputs (normal or alternate).
(2) Switching and reconfiguration capabilities There are no cross-talk links between the 3 DMCs, in order to ensure complete segregation of CAPT and F/O displays. Inside the DMCs, downstream of the PFD, ND, ECAM channels, there are switching devices for the DSDLs.
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EFIS - ECAM Reconfiguration Capability R Figure 052
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ECAM Reconfiguration Between DMC's and Between DUs R Figure 053
R 1EFF : 001-049, 051-099, 101-105, 151-199, 1 31-60-00Page A7 1201-299, 301-302, 1Config-1 May 01/05 1 1 1CES 1 These switching devices provide 2 levels of switching, which will enable the crew to cope with the operational transfer requirements below in case of failure of a DMC or a DU (or possibly , some failures of EFIS or ECAM controls, FCU and ECAM CP):
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