User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
Depending on the transponder in use by the T
3
CAS system, COMM-D
may be supported.
(b) ADLP Interface and ADLP Function
The initial implementation of the T
3
CAS Transponder function is a Level
3 transponder according to the definitions in DO-181A and ICAO Annex
10. It can process COMM-A/B/C Data Link messages and it interfaces to
an external Mode S Airborne Data Link Processor (ADLP), which is
defined functionally by RTCA DO-218. The T
3
CAS Transponder function
contains four high-speed ARINC 429 data busses, a COMM-A/B Input
and Output Bus, and a COMM-C Input and Output Bus. COMM-A Data
received by the transponder in an interrogation are transferred to the
ADLP on the COMM-A/B data bus; COMM-B data received from the
ADLP are transmitted in replies to interrogations. In a similar manner,
COMM-C data received by the transponder in an UELM interrogation are
transferred to the ADLP on the COMM-C data bus.
There are certain XS-950 part numbers that support Level-4 functions.
These can process COMM-A/B Data Link messages and interface to an
external Mode S ADLP to process COMM-C/D Data Link messages,
which is defined functionally by RTCA DO-218. The XS-950 transponder
contains four high-speed ARINC 428 Data Busses, a COMM-A/B Input
and Output Bus, and a COMM-C/D Input and Output Bus. COMM-A Data
received by the transponder in an interrogation is transferred to the
ADLP on the CMM-A/B data bus; COMM-B data received from the ADLP
is transmitted in replies to interrogations. In a similar manner, COMM-C
Data received by the transponder in an UELM interrogation is transferred
to the ADLP on the COMM-C/D data bus; COMM-D data received from
the ADLP is transmitted in a DELM reply to an interrogation.
NOTE:
COMM-D functionality is not supported by Level 3
transponders.
NOTE:
XS-950 transponders which are DO-181E-compatible are
Level 3 transponders per the definitions in DO-181E and
ICAO Annex 10.
(c) Altimeter Interface
The T
3
CAS Transponder function can accept non-corrected pressure
altitude inputs from air data systems. The transponder has an interface
for ARINC 429 Air Data and ARINC 575 Air Data Systems. The
transponder contains two independent inputs for each source and a
discrete input for source selection.
(d) Controller Interface
The T
3
CAS Transponder function is controlled from a standard Mode S
or Mode S/TCAS control panel through an ARINC 429 input data bus
and discrete inputs and outputs. The control panel interface is defined in
ARINC 718. However, several variations exist for different customers
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04 Nov 2014
34-45-29
Pub. No. 8600200-001, Revision 004
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