User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
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Page 142
15 Dec 2005
G. XS950 Mode S Data Link Transponder
The XS950 Data Link Transponder provides surveillance functions to ground based and
airborne interrogators, and communication functions to various onboard systems. The
transponder contains data link functions that allow it to function as part of the Aircraft
Telecommunications Network (ATN). The data link functions allow communication with a
Communication Management Unit (CMU) through a Mode S Airborne Data Link
Processor (ADLP). The transponder also contains Mode S specific functions that are
dedicated links to onboard systems. The XS950 Transponder has the capability to be
upgraded to provide an internal airborne data link processor (ADLP) function.
The XS950 Transponder conforms to the ARINC 718A Mode S Transponder
Characteristic for form, fit and function, and is backward compatible with existing ARINC
718A installations. It is certified to ICAO level IV data link capability and can be
upgraded to level V data link capability.
The XS950 Data Link Transponder is packaged in a 4MCU (Modular Concept Unit)
outline as defined in ARINC Characteristic 6007. The unit is able to utilize ARINC 404
cooling air moving through the LRU in a downward direction as well as ARINC 600
cooling air moving through the LRU in an upward direction. The rear connector
receptacle is an ARINC 600 size 2 shell assembly with inserts and contacts as defined in
ARINC Characteristic 718A. The unit also features a fixed carrying handle and selftest
button with discrete LRU STATUS annunciators.
Figure 116 shows a graphical view of the XS950 Data Link Transponder and
Table 111 gives items and specifications that are particular to the transponder.
Figure 116. XS950 Data Link Transponder