User's Manual

Table Of Contents
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
T
3
CAS/Part No.9005000
Table 4-2: T
3
CAS Computer Unit Interface Description
(Applicable to Part No. 9005000-11801 and -55801)
Connector
Pin
Designation
Functional Description
LBP-9
Fan 115 V ac Power Output (C)
See LBP-5.
LBP-10
28 VDC Power Input (+)
LBP-11
Chassis Ground
Connect to aircraft frame. The T
3
CAS Chassis and signal ground pins should use
the same AWG as the power connections (See LBP-1 and LBP-10).
LBP-12
Mutual Suppression Pulse Bus Input A
The T
3
CAS computer unit joins the mutual suppression bus daisy chained through
TCAS and other RF-transmitting equipment onboard the aircraft. The TCAS function
receives suppression pulses from other LRUs on this bus, which is used to
suppress the TCAS receivers during such transmissions. This prevents the TCAS
function from interpreting these transmissions as valid replies from an intruder
aircraft. When not suppressed, the TCAS function transmits its own suppression
pulses on the same bus in order to suppress the receivers in other L-band systems
on the aircraft. The L-Band suppression coax must be RG142, RG400, or
equivalent coaxial cable which meets the operational characteristics required by
ARINC 735A.
LBP-13
Mutual Suppression Pulse Bus Input B
See LBP-12.
The Interface descriptions that follow are for the 53-pin connector J1 mounted on the front
panel of the T
3
CAS computer unit. These descriptions are used to make up the cable that is
used to interface between the T
3
CAS computer unit and an ARINC 615A Ethernet, a RS-232
PC Serial Port, or an ARINC 429 Maintenance Display.
J1-1, 2
ARINC 429 PDL Bus Input: [J1-1 (A), J1-2 (B)]
Reserved.
J1-3, 4
Spare Pins
J1-5
Output Bus Shields
The shields from the output bus (J1-8, 9) should be connected to this pin.
J1-6, 7
A615A Data Loader Ethernet Output [J1-6 (TD+), J1-7 (TD-)]
TAWS Ethernet 10 Base-T.
J1-8, 9
ARINC 429 Data Loader/PDL Recorder Bus Output: [J1-8 (A), J1-9 (B)]
Reserved.
J1-10
Thru
J1-15
Spare Pins
Pub. No. 8600200-001, Revision 004
34-45-29
4-67
04 Nov 2014
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