Explaining MIL-STD 1275

Techaya’s complete line for military-grade Ethernet switches, routers and hubs are developed from the ground up to meet rigorous military standards for shock, vibration, temperature rating power requirements and other rigorous standards to ensure that a piece of equipment will hold up under the most toughest of mission, terrains and volatile situations. We often get questions as to what MIL-STD 1275 is when it comes to meeting power requirement.

MIL-STD-1275 covers the characteristics of 28-VDC (as opposed to 12 VDC) electrical systems in military vehicles and provides detailed requirements for military ground platform electrical systems, including electromagnetic compatibility (EMC), starting mode, normal operating mode, generator-only mode operation, and their associated spikes, surges and operating limits.

MIL-STD 1275 compliant power supply needs to withstand voltage transients as specified within the standard without causing component damage to itself or the electronics powered by it. In addition to withstanding the spikes and surges without damage, it also should continue to supply clean, well regulated power to its load(s) while “riding through” these spikes and surges.

Because computers in military environments must coexist with other equipment, such as powerful radio, radar, and microwave transmitters as well as highly sensitive receivers, the MIL-STD-1275 embeds requirements from the military EMI/EMC standard MIL-STD-461. This standard governs radiated and conducted emissions and susceptibility. In this way, electrical systems are limited to the amount of noise they can generate and what types and levels of interference they tolerate. As part of the meeting MIL-STD-461 susceptibility requirements, MIL-STD1275 dictates the amount of conducted RF energy the device must be able to withstand and still operate properly. For example, from 30 Hz to 5 kHz, the device must be able to withstand 126 dBµV (about 2 Vrms) added on top of the dc supply voltage.

Ethernet is rapidly becoming the standard for mobile military and other rugged applications due to proven interoperability, reliability, and speed. Historically, dedicated bus architectures have been used in military applications, resulting in heavy and somewhat inflexible systems. Ethernet has been shown as a viable alternative for a number of reasons including ubiqitousness, interoperability, wide availability of components.

In addition to Ethernet, other wired communications technologies will continue to be used including USB and serial communications. COTS solutions are not rugged enough, require AC power, are too large, and weigh too much for typical military applications. Where every square inch of space, every ounce of weight, and every watt of power is critical, Techaya delivers rugged, small, light, power-efficient solutions that support sophisticated switching applications.

We hope this information helps.  More information on MIL-STD can be located here. We’re happy to answer any questions that we can regarding military standards or how Techaya can help you reach those requirements for your project.