INSTALLATION MANUAL
CMA-5024 GLSSU
This document includes Proprietary Information and shall not be reproduced or communicated to third party
without prior written permission by CMC Electronics Inc.
Page A.6
November 21, 2008
The SDI field identifies the source or destination of the data. Discrete Inputs define the SDI of each
GLSSU in the aircraft installation; refer to Appendix A section 1. A. (1) above for encoding. Re-
transmitted labels retain their original SDI.
The SDI field is not present in all labels. Hence N=11 (18 bits word) when SDI data bits are present,
N=9 (20 bits words) when SDI bits are absent.
The SSM field definition varies as indicated in Figure A-1.
SIGNAL FORMAT
SSM BCD
(Binary-Coded Decimal
Data)
BNR
(Binary Data)
DISC & BLOCK
(Logic Data)
ARINC 419
00 Plus, North, East, Right, To,
Above
Failure Warning Normal
Operation
Plus, North, East,
Right, To, Above
01 No Computed Data (NCD) NCD NCD Failure Warning
10 Functional Test Functional Test Functional Test NCD
11 Minus, South, West, Left,
From, Below
Normal Operation Failure Warning Minus, South, West,
Left, From, Below
Figure A-1. SSM Bits Setting
The received data will be rejected when the SSM value is Failure Warning, No Computed Data, or
Functional Test. Some BCD labels define the value SSM = 11 as unused in both this document and
ARINC 743A-4. In this case the GLSSU will interpret SSM = 11 as a Failure Warning and will reject the
received data.
1.2.2 ARINC 429 INPUTS
1.2.3 ARINC 429 DATA INPUTS CONFIGURATION
The GLSSU accepts data from sixteen ARINC 429 input busses, (one of which can be ARINC 419 per
the DADS 419/429 Select discrete input) via connector J1 as follows; unless said otherwise, the input
busses operate at high or low speed:
- Two Digital Air Data System (DADS) or Flight Management System (FMS) inputs
- Two Inertial Reference System (IRS) or FMS inputs
- The On-board Maintenance System (OMS) input
- Two General Purpose / Differential correction (GP/DIFF) inputs
- The ARINC 615 input bus, intended for connecting a Data Loader Unit (DLU) and operating at high
speed only
- Two Freq/Function Data Source inputs from a Controller Unit (optional)
- Two Distance Measuring Equipment (DME) inputs, operating only at low speed
- Two Instrument Landing System (ILS) receiver inputs, operating only at low speed
- Two GLS X-Talk inputs, operating only at high speed.
CAUTION: All FMS shall be wired exclusively to either the IRS/FMS input busses or to the
FMS/DADS input busses.
CAUTION: If implemented, X-Talk connections between GLSSUs must be made as follows:
For X-Talk connections in a dual installation (Left/Right units), interconnect the Left &
Right units using the opposite X-Talk #1 inputs.
The document reference is online, please check the correspondence between the online documentation and the printed version.
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