VITA 93 addresses a persistent challenge in rugged embedded systems: sustaining long-lived platforms while accommodating rapid advances in I/O, networking, and processing technologies under strict SWaP-constraints. In this context, QMC is not simply a new mezzanine format, but a mechanism for enabling adaptable architectures within increasingly space-and power-limited environments. 

In the near term, adoption introduces familiar considerations. Defense programs must evaluate qualification paths, configuration control, and long-term availability when introducing a new mezzanine standard. The compact mechanical envelope of QMC also places greater demands on signal integrity, thermal management, and mechanical robustness, particularly in conduction cooled and environmentally sealed systems. As with any emerging standard, ecosystem maturity and interoperability confidence will build progressively.  

The longer-term opportunity is substantial. VITA 93 enables higher functional density in minimal space, allowing multiple mission-specific capabilities to be integrated or reconfigured without expanding the platform footprint. This flexibility supports incremental technology insertion while preserving certified host platforms, reducing redesign cycles and lifecycle risk. 

 From a modular open systems perspective, QMC strengthens the separation between platform infrastructure and rapidly evolving functions. Its PCIe-centric approach allows system architects to scale bandwidth, reassign functions, or introduce new capabilities as mission requirements evolve, all within constrained SWaP-envelopes. 

 Over the full system lifecycle, this approach promotes reuse across programs, improves sustainment predictability, and enables controlled evolution rather than disruptive refresh. By combining modularity with density, VITA 93 provides a foundation for defense systems that are not only rugged and reliable, but adaptable to changing operational demands throughout extended service lives. 

Mark Littlefield, Director, System Products, Elma Electronic 

The latest VITA architecture, VITA 90, known as VNX+, needed a standards-based I/O module that would fit its small form factor. XMC would not work because it was too large for VNX+, while other standards-based I/O modules like M.2 and PCI Express Mini (mPCIe) do not offer a standard-based I/O connectivity like found on XMC. Therefore, a new standard I/O mezzanine card form factor was created: VITA 93, known as QMC.  

The QMC mezzanine card standard (VITA 93.0) form factor is small enough to fit inside a 19mm VNX+ (VITA 90) module.  Beyond its small size and standards-based I/O connector, QMC offers a number of other features not found in other standards: 

• High-performance host and I/O connector – providing up to PCIe Gen5 speeds (higher than XMC and mPCIe) 
• Size and connectivity (host and I/O) scaling by using double, triple, or quad-wide modules (not offered by M.2 or mPCIe) 
• Provides stand cooling structures (not found in XMC, M.2, or mPCIe) 
• QTM (VITA 93.1 QMC transition module) offers conversion to standard commercial connectors, giving vendors a way to easily offer such a conversion (not found in XMC, M.2, or mini-PCIe). 

 Jing Kwok, Technical Director, VITA 

QMC has applicability well beyond VNX+.  The standard was drafted with other existing open architectures in mind, such as OpenVPX, VME, CompactPCI/CPCI-Serial, and PCI Express edge cards. It can also be utilized on any carrier card requiring high performance I/O and conduction cooling such as industrial motherboards or even potentially laptops. 

As rugged embedded systems continue to demand higher capability within shrinking SWaP limits, the size of traditional mezzanine cards such as XMC has become a significant constraint. Their larger footprint limits how many independent functions can be integrated on a single carrier. VITA 93 addresses this challenge directly. The QMC form factor is substantially smaller than XMC, allowing multiple modules to fit in the same area that previously held only one. This increase in functional density gives system developers far more flexibility when assembling mission‑specific capability sets. 

Along with its compact size, VITA 93 leverages a modern electrical architecture. QMC uses a high‑speed PCIe host interface that supports the bandwidth requirements of today’s rugged embedded systems, while still providing user I/O for application‑specific connectivity. By combining a small mechanical envelope with high‑performance PCIe and flexible I/O, VITA 93 enables higher integration, better scalability, and more efficient use of limited board space in rugged embedded platforms.