INSTALLATION MANUAL
CMA-5024 GLSSU
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without prior written permission by CMC Electronics Inc.
Page A.27
November 21, 2008
(l) The maximum transport delay for the navigation block and guidance data is 150 ms for a GLS bus and
200 ms for a GPS bus. For measurement blocks, a maximum transport delay of 200 ms applies only to
a high-speed output bus. When selecting a GLS source on the HIS, the maximum transport delay on the
DME look-alike bus is 250 ms from GLSSU generated data and 100 ms for pass-through data. When
selecting a GLS source on the HIS, the maximum transport delay on the ILS look-alike bus is 150 ms
from GLSSU generated data and 100 ms for pass-through data.
(m) Labels used by the ARINC IBIT with the SSM set to Functional Test.
(n) The data is limited by software to +/-90.
(o) The data is clamped when it reaches the limit of the label range while maintaining the correct sign and
therefore the SSM cannot become NCD due to a value that exceeds this range.
(p) Labels 045 and 046 are transmitted in block transfer format where label 045 is sent first followed by a
series of labels 046. Other labels may be interspersed within the series of labels 046 as required to
support their transmit intervals. Either the data block length specified in the initial label 045 or the
presence of a subsequent label 045 with the same station slot identifier and SDI can be used to
determine when all the series ends.
(q) Sent on request, in a 50ms rate burst of labels until the complete OMS configuration data message has
been transmitted once.
(r) The "range" and "resolution" columns have the same units as the "units" column unless otherwise
specified. The resolution column for the BNR signal format is "informative only" when the symbol ""is
used since then only the first 3 significant digits of the resolution are provided. In such cases, the exact
resolution is given by the Range over 2**(Significant bits).
(s) The GLSSU will output label 370 on the GPS bus only if the "GPS Height Output on GPS bus" APD is
enabled.
(t) Bit 11 encodes the state of the test Tune/Guidance Test Inhibit as 'Not Inhibited'.
(u) Deleted
(v) Deleted
(w) The data is limited by software to +300.
(x) When transmitted on the Look-Alike bus, the data rate will match (with a 50 msec resolution) that of the
same label received on the input bus up to 50 msec. If there is no activity on the Look-Alike input
busses, the pass-through labels can no longer be output, but the nominal data rate as per Table 4-3
applies to the sensor-generated labels
(y) Includes variable pass-through labels received on the ILS/DME inputs.
(z) Label 202 bit 11 is set to 0 to indicate memory mode off and bit 12 is set to 1 to indicate foreground
station data in frequency scan mode. Label 214 and 117 bits 12-11 are set to 11 = FA normal track.
Label 117 bits 16-13 are set to zero.
(aa) The encoded Equipment ID is set by the "GLS Bus Equipment ID" APD on the GLS Bus and by the
"GPS Bus Equipment ID" APD on the GPS Bus. Refer to Appendix E.
1.2.12 SELECTED SBAS APPROACH OUTPUTS
When a valid SBAS approach is selected, the GLSSU outputs the following approach descriptors with
the data indicated below:
(1) Label 033: Channel Number of the selected approach
(2) Label 017: BCD Runway Heading if available
(3) Label 105: BNR Runway Heading if available
(4) Label 232: GLS Airport Identifier characters #2-#4 extracted from the FAS Data Block
(5) Label 254: GBAS ID (always character NULL)
(6) Label 255: GLS Airport Identifier character #1 extracted from the FAS Data Block
(7) Label 243: GLS Runway Data (Number, Letter, and Route Indicator extracted from the FAS
Data Block)
(8) Label 264: GLS Approach Identifier (Ref. Path) extracted from the FAS Data Block
(9) Label 263: GLS Approach Identifier (Ref. Path) extracted from the FAS Data Block
The document reference is online, please check the correspondence between the online documentation and the printed version.
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