信号处理单元具有一总线板（10）具有用于机架的连接标准化的数据总线和狭槽（11，12）和用于提供具有所述背板的一个集成的特殊的布线和在狭槽的多个（12）的辅助电路板（13）的附加传输性能 （10）可以插入的，间隔开排列的连接器条带（14）。 用于成形附加电路板（13）的目的，使得其放置而没有损坏的风险与背板（10）和所述总线板（10）相对小的努力可以至少在边缘连接器（14），其位于部分之间再次除去，（15 的附加电路板（13）形成）是柔性的。 由此，通过在总线板（10）的附加电路板（13）可以是准轧制，和边缘连接器（14）可单独插入。

A signal processing unit includes a backplane (10) with standardized data and slots (11, 12) for attachment of subracks and for providing additional transfer capacity an additional board (13), the integrated special wiring and a plurality of in slots (12) of the Backplane (10) can be inserted, spaced apart arrayed connector strips (14). Purpose design of the auxiliary board (13) such that it can be detached plugged without risk of damage with relatively little effort on the backplane (10) and of the backplane (10) again, at least between the connector strips (14) is located portions (15 ) the accessory card (13) designed to be flexible. This can be virtually rolled the auxiliary board (13) via the bus board (10), and the plug connectors (14) can be inserted individually.