A second group within DIN Signal is an extension of the range, which offers expanded functionality. With the arrival of VME64x architecture processing speeds and data transmission rates were increased. Therefore, the three row connectors had to evolve. The har-bus® 64 range grew from the roots of DIN Signal three row connectors, with the addition of two outer rows. A key feature in the design of har-bus® 64 is backwards compatibility between the five row configuration and more conventional three row versions. Here the user can mate three and five row connectors together, thereby allowing gradual upgrade of existing Eurocard based systems without the cost of a complete system redesign. HARTING’s unique offering encompasses the entire range of daughter card, backplane/midplane, extender and crimp connectors for the complete VME64x system.