Six-Slot 3U VPX Backplane utilizes twisted-ring topology.

Press Release Summary:

Compliant to VITA 46 specifications, 3U VPX backplane facilitates 2 channels at top of J1 connector, typically for Gigabit Ethernet traffic in fat pipe (4x bi-directional links). Remaining channels in J1, together with those in J2, leave 24 XAUI capable ports that can be utilized for rear-panel I/O. This lets remaining 24 thin pipe (one or 2 bi-directional links) channels be used by PMC or XMC mezzanine or interface with external equipment/networks/displays/storage systems.

Original Press Release:

Bustronic Announces 3U VPX Backplanes

FREMONT, California, Nov 1, 2007 - Elma Bustronic Corporation, an industry leading designer and manufacturer of high performance backplanes has developed new 3U VPX backplanes. The company now offers VPX backplanes in 3U, 6U, and 6U Hybrid (VPX/VME mix).

Continuing Bustronic's leadership in VPX backplanes, the company has developed a 6-slot 3U version. The 3U VPX features a twisted-ring topology and is compliant to the latest VITA 46 specifications. Utilizing a twisted-ring versus a mesh topology allows for more I/O pins and ability to use mezzanines like XMC.

The backplane facilitates two channels at the top of the J1 connector, typically for Gigabit Ethernet traffic in a fat pipe (4x bi-directional links). The remaining channels in J1 together with those in the J2 leave 24 XAUI capable ports that can be utilized entirely for rear panel IO. The 24 thin pipe (one or two bi-directional links) channels remaining can be used by a PMC or XMC mezzanine or simply allow the 3U VPX modules to interface with external equipment, networks, displays or storage systems.

The VPX backplane also incorporates the Gigabit Ethernet Control Plane per VITA 46.20. This sub-specification adds a GigE switch, providing a separate star or dual star network for out-of-band communication. This can be particularly important for system management, software and firmware upgrades, and initiating new processes on specific boards. The backplane was designed with a 12-layer controlled-impedance stripline design. To ensure optimal performance, signal integrity analysis was performed on the backplane.

Founded in 1989, Elma Bustronic specializes in the design and manufacture of high-performance backplanes. Elma Bustronic has a complete line of industry-standard backplanes, including CompactPCI, VME, VME64x, H.110 CT, VXI, VXS, and ATCA. Elma Bustronic's custom design service combines creative engineering, highly sophisticated computer simulation and modern design techniques to offer customized backplanes that meet the most specialized system requirements. A member of the ELMA Electronic group, Elma Bustronic is located in Fremont, California. Elma Bustronic is a member of PICMG, VITA, and the StarFabric Trade Association and can be found on the World Wide Web at

Company Contact: Justin Moll, Bustronic Corporation
510.490.7388 510.490.1853 fax e-mail:

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