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 15
Revision 1 Jan 19, 2009
The APD Configuration controls which of the 3 ARINC 429 busses are GLS or GPS busses; at least one
bus must be configured as GLS bus to comply with the requirements in TSO-C145b Class Beta-3 and
TSO-C146b Class Delta-4, although the GLS busses may be unused actually.
Refer to Appendix A and C for detailed GLSSU interface information and the data formats. Refer to
Appendix E for APD impact on ARINC 743-4 compatibility.
Notes: The label set on the ARINC 429 GPS busses conforms to the data format in ARINC 743A-4
unless otherwise stated in Appendix C.
A GPS bus may transmit extra labels not defined in ARINC 743A-4 if enabled by the APD
Configuration; refer to Appendix E.
An ARINC 429 GLS bus contains additional labels and operates at faster transmission rates.
The presence and data format of some of these labels is controlled by the APD Configuration;
refer to Appendix E.
A GLS bus cannot be configured by the APD Configuration to comply with ARINC 743A-4; this
requires using a GPS bus.
The following diagram shows a typical ARINC 743A-4 retrofit installation using the GLSSU that
implements only Class Beta-1 functions. Note that in this case only the Navigation connector J1 and the
RF connector J2 are used; the Approach connector J3 is unused and its cap remains fixed permanently
for preventing damage and corrosion. The APD parameters of the GLSSU must still be set correctly
and thus the proper APD File and APD Configuration must be chosen. When the Approach connector
J3 is unused, APD Configuration 0 is selected; refer to Appendix E for details.
The document reference is online, please check the correspondence between the online documentation and the printed version.
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