NIU2U
Rugged Embedded Multifunction I/O System with 2 Expansion COSA® Module Slots
The NIU2U is a compact, rugged, low-power, self-contained multifunction I/O system that can be configured with two smart Configurable Open Systems Architecture™ (COSA®) function modules. It incorporates a dual-core or quad-core ARM® Cortex®-A53 processor to support customer applications, as well as I/O and communications management.
The NIU2U supports two 10/100/1000BASE-T (GbE) Ethernet ports with an option for Fiber optic ports, one USB 2.0 interface and an RS-232 interface for maintenance, diagnostics, or configuration. Designed for rugged military and aerospace applications, the NIU2U provides a COTS-based solution that supports rapid deployment of SWaP-optimized systems across air, land, and sea platforms.
The NIU2U multifunction I/O and communications platform enables scalable system-level architectures for network-centric operations. One module slot supports PCIe-capable COSA modules, including options for single-channel, tri-redundant TTEthernet/AFDX (ARINC 664 Part 7)/best-effort Ethernet, dual 10/100/1000BASE-T Ethernet, or dual-node, three-port FireWire (IEEE 1394).
docs.naii.com Link
9/15/2026 3:21:44 PM
9/21/2026 2:44:29 PM
9/21/2026 2:44:47 PM
NAI’s Configurable Open Systems Architecture™ (COSA®) offers a choice of over 100 smart I/O, communication, and Ethernet switch functions, providing the highest package density and greatest flexibility of any multifunction I/O board in the industry. Preexisting, fully-tested functions can be combined quickly and easily in an unlimited number of ways. Choose the ideal platform for your application below. Each I/O function has dedicated processing, unburdening the system Single Board Computer (SBC) from unnecessary data management overhead.
Related COSA® Products
Need more or less configurations than the NIU2U? Choose from NAI's standard COTS configurable systems that you can populate with pre-integrated boards, smart function modules, power supplies and software libraries of your choice.
| Model |
Dimensions w/
Connectors (w x h x d) |
Weight / lbs. | Function Module Slots |
Board Slots |
Board Formats | SOSA™-Aligned |
|---|---|---|---|---|---|---|
| CIU3/CIU3P | 9.5" x 8.25" x 1.125" (CC*) | < 4.5 lbs. (CC*) (fully populated) | 3 | N/A | Integrated System | N/A |
| NIU1A | 6.8" x 1.5" x 2.5" (CC*) | < 1.2 lbs. (CC*) (fully populated) | 1 | N/A | Integrated System | N/A |
| NIU1U | 7.4" x 2.2" x 2.8" (CC*) | < 1.75 lbs. (CC*) (fully populated) | 1 | N/A | Integrated System | N/A |
| NIU2A | 7.3" x 3.1" x 2.7" (CC*) | < 2.7 lbs. (CC*) (fully populated) | 2 | N/A | Integrated System | N/A |
| NIU3A | 7.2" x 5.5" x 3.2" (CC*) | < 5.4 lbs. (CC*) (fully populated) | 3 | N/A | Integrated System | N/A |
| NIU3E | 7.2" x 7.1" x 3.2" (CC*) | < 7.7 lbs. (CC*) (fully populated) | 1 | N/A | Integrated System | N/A |
| NIU3R | 6.2" x 5.82" x 1.62" (CC*) | < 3.0 lbs. (CC*) (fully populated) | N/A | N/A | Integrated System | N/A |
| SIU31 | 4.7"x 2.4" x 8.7" (CC*) | < 3.15 lbs. (CC*) (unpopulated**) | 3 | 1 | cPCI | N/A |
| SIU33 | 4.7" x 4.8" x 8.7" (CC*) | < 5.5 lbs. (CC*) (unpopulated**) | 9 | 3 | cPCI | N/A |
| SIU35 | 7.1" x 4.8" x 8.7" (CC*) | < 7.5 lbs. (CC*) (unpopulated**) | 15 | 5 | cPCI | N/A |
| SIU34 | 5.7" x 5.9" x 9.4" (CC*) | < 9.7 lbs. (CC*) (unpopulated**) | 12 | 4 | OpenVPX | N/A |
| SIU36 | 9.0" x 5.0" x 9.5" (CC*) 9.0" x 6.4" x 9.5" (AC*) |
< 13.2 lbs. (CC*) (unpopulated**) < 14.4 lbs. (AC*) (unpopulated**) |
18 | 6 | OpenVPX | N/A |
| SIU32S | 6.0" x 4.6" x 9.5" (CC*) 6.2" x 4.8" x 9.5" (AC*) |
< 6.6 lbs. (CC*) (unpopulated**) < 6.9 lbs. (AC*) (unpopulated**) |
6 | 2 | OpenVPX | Yes |
| SIU34S | 7.8” x 5.1” x 9.5” (CC*) 6.0" x 7.2" x 9.5" (AC*) |
< 9.2 lbs. (CC*) (unpopulated**) < 9.7 lbs. (AC*) (unpopulated**) |
12 | 4 | OpenVPX | Yes |
| SIU36S | 10.0" x 5.1" x 9.5" (CC*) 6.1" x 9.5" x 9.5" (AC*) |
< 13.2 lbs. (CC*) (unpopulated**) < 14.4 lbs. (AC*) (unpopulated**) |
18 | 6 | OpenVPX | Yes |
NOTE*: (CC) = Conduction-Cooled, (AC) = Air/Convection-Cooled
NOTE**: To get fully populated chassis weight, add 1.35 lbs. for each SBC or I/O CCA and 2.2lbs. for PSU.
North Atlantic's resource center is where you will find information on warranty and repairs, details of our Product Lifecycle Management and Configuration Management programs – and much more.
Visit Resource Center