ARINC 708

ARINC 708

ARINC 708 is a specification for airborne pulse doppler weather radar systems primarily found on commercial aircraft. ARINC 708 and the Honeywell Picture bus are the predominant avionics data bus for most aircraft today superseding ARINC 453.

Technical Description

ARINC 708 uses a transformer-coupled Manchester encoded signal, like the MIL-STD-1553 protocol. Termination of the bus is essential for good signal quality. Furthermore, the bitstream is continuous, requiring good re-synchronization to the bit stream. Data frames are 1600 bits long with the header portion of the frame consisting of parameters such as range, tilt, gain, status, etc. The data portion is organized into 512 range-bins per scan angle value. Each range bin contains a color value to indicate the intensity at that position. Settings for the ARINC 708 system is typically controlled using an ARINC 429 interface.

Avionics Weather Radar Systems

Commercial Weather Radar Systems consist of the following items:
*Antenna
*T-R Unit (Transmit-Receive Unit)
*CDU (Control-Display Unit)
*Display

Variations

Variations from the standard specification include variable word length and non-standard amplitude values. Some implementations also require non-standard re-synchronization.

See also

*ARINC 429 protocol used to control radar.
*MIL-STD-1553 protocol is electrically similar to ARINC 708.

External links

* [http://www.arinc.com ARINC Website]
* [http://www.mil-1553.com/Templates/showpage.asp?DBID=1&TMID=86&FID=216 ARINC 708 Interface Products (Excalibur Systems, Inc.)]
* [http://www.maxt.com/products/ipm-708.html ARINC 708 Industry Standard IPack Module (Max Technologies)]
* [http://www.ballardtech.com/products.aspx/dir/protocol/ARINC_708/?link=Wikipedia ARINC 708 Interface and Analyzer Products (Ballard Technology, Inc.)]


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