(7)
 Data loader A plug is installed next to the computer for the loading of the operational program and I/O configuration data into the TCAS computer via 2 ARINC 429 low speed buses, by means of a data loader.

 **ON A/C 201-207, 210-210,
 Post SB 34-1179 For A/C 201-207,
 Post SB 34-1238 For A/C 201-207,
 (4) DSP assembly (A4) A signal processor and CPU (Central Processing Unit) provide the control and data analysis necessary for the TCAS computer operation. The signal processor circuits serve as a preprocessor between the system software and the RF circuits.
R 1EFF : 106-149, 201-299, 301-399, 401-499, 1 34-43-00Page 37 1 1 Aug 01/05 1 1 1CES 1 The CPU is made of two microprocessors and their associated memories. This is the portion of the TCAS computer that contains the algorithms for analyzing data developed as a result of signals from transponders of other aircraft. The CPU generates the traffic and resolution advisories for output to the cockpit displays. It is software-controlled and communicates with the signal processor and input/output interface through the system bus. The input/output interface circuits are the A/D, D/A, ARINC, discrete and analog circuits required to communicate with external TCAS equipment. The interface has a CPU to control its operation.

 (5)
 I/O CPU assembly (A5) Three ARIES ARINC 429 unloader Application Specific Integrated Circuits (ASIC) are used to load/unload ARINC 429 data directly from/to the global memory space. Access to the global memory space is arbitrated between CPU A (AMP2) and CPU I (AMP5V) and the ARIES devices. CPU A is without peripherals in its local memory space. CPU A communicates with CPU I and the signal processor through the global memory space. CPU A local memory space contains only RAM, program memory (FLASH), memory mapped access to the global space, and an interrupt controller. CPU I memory space also contains RAM, program memory (FLASH), memory mapped access to the global space and an interrupt controller, plus several local peripherals, an analog-to-digital converter, a dual serial port, a speech device, and discrete I/O. The global memory space contains a 2-channel timer, RAM, the signal processor dual port, EEPROM (for fault logging), cross interrupts, discrete I/O, ARINC 429, display port, a memory card interface and discrete I/O. Data is passed directly to the memory card.

 (6)
 Input/output card (A2) The input/output interface circuits handle the A/D, D/A, ARINC, discrete and analog signal conversions required for communication with external TCAS equipment.

 (7)
 Data loader A plug is installed next to the computer for the loading of the operational program and I/O configuration data into the TCAS computer via 2 ARINC 429 low speed buses, by means of a data loader.

 **ON A/C ALL
 B. ATC/TCAS Control Unit
 For detailed description, Ref. 34-52-00, Para. 5.B.

 1EFF : ALL 1 34-43-00Page 38 1 1 Aug 01/05R 1 1 1CES 1

 **ON A/C 001-049, 101-105, 151-199,
 C. TCAS Antennas
 (Ref. Fig. 007) The directional antenna is composed of four passive vertically-polarized elements. This high-strength composite antenna is provided with a curved base (110 in), eight fuselage mounting screws and four color-coded connectors used to coaxially connect the four antenna elements to the TCAS computer. A teflon gasket is located between the fuselage and the base of the antenna, in order to facilitate the removal of the antenna. An O-ring is provided to seal the antenna to the fuselage. The antenna is used to receive and provide directional information for 1090 MHz Mode S squitters, Mode S and Air Traffic Control Radar Beacon System (ATCRBS) replies. Proper phasing of the four antenna elements enables omni or directional transmission of 1030 MHz broadcast or coordination messages and ATCRBS or Mode S interrogations.
 **ON A/C 051-099,
 C. TCAS Antennas
 (Ref. Fig. 007A)
 The TCAS directional antenna is a four-element, vertically polarized,
 monopole array which is capable of transmitting in four selected
 directions at 1030 MHz and receiving omnidirectionally with bearing at
 1090 MHz using amplitude monopulse techniques.
 Both directional antennas are curved base plates (77 in. Radius).
 A teflon gasket is located between the fuselage and the base of the
 antenna. One O-ring is used at the center connectors in order to
 withstand the max pressure differential.

R **ON A/C 106-149, 201-299, 301-399, 401-499,
 C. TCAS Antennas
 (Ref. Fig. 007B) The directional antenna is composed of four passive vertically-polarized elements. This high-strength composite antenna is provided with a curved base (110 in), eight fuselage mounting screws and four color-coded connectors used to coaxially connect the four antenna elements to the TCAS computer.
　
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