Elma Bustronic Announces 3U VPX Backplanes

FREMONT, California, Oct 26, 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

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. A full mesh topology over 3U VPX would
simply take up the vast majority of available pins.

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, Bustronic specializes in the design and manufacture of high-performance backplanes. Bustronic has a complete line of industry-standard backplanes, including CompactPCI, VME, VME64x, H.110 CT, VXI, VXS, and ATCA. 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, Bustronic is located in Fremont, California. Bustronic is a member of PICMG™, VITA, and the StarFabric Trade Association and can be found on the World Wide Web at www.ElmaBustronic.com.

Contact Information

Elma Electronic Inc.

44350 S. Grimmer Blvd.
Fremont, CA, 94538
United States

tele: 510-565-3400
fax: 510-656-3783

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