The Software Communication Architecture (SCA) is a set of underlying infrastructure specifications developed by the US DoD Joint Tactical Radio System (JTRS) for radio communication. The SCA describes the interaction between the software and hardware components of a radio and provides a set of software commands that control those components.

The SCA promotes the segregation of the RF, digital signal processing hardware and software and provides a mechanism to tie them all together. The international Software Defined Radio Forum (SDRF) has also adopted the SCA architecture.

Harris' SDRs are SCA-compliant and have a core framework that adheres to the SCA.

Harris-Implemented SCA Versions

Examples:

• SCA 1.0/1.1 (12/00)
• VxWorks / Pentium / ORBexpress GT 2.1.4
• VxWorks / PowerPC / ORBexpress GT 2.1.4
• VxWorks / StrongARM / ORBexpress RT 2.3.1A-ß
• LynxOS / PowerPC / ORBexpress GT 2.1.4B-ß
• SCA 2.2 (06/02)
• Windows / Pentium / ORBexpress RT 2.3.5 (09/02)
• Windows / Pentium / ACE-TAO (10/02)
• VxWorks / PowerPC / ACE-TAO (11/02)
• Linux / Intel / ACE-TAO (09/03)
• Familiar Linux / ACE-TAO / Compaq iPAQ (Preliminary)
• SCA 2.2.1 (11/04)
• Current 2.2 versions and
• Windows / Pentium / eORB (12/04)
• SCA 3.0 (Early 2005)
• Primarily validation effort. Impact is primarily in the FPGA and DSP waveform code implementation.
• Others provided per customer request