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Intelligent Cross Line Unit (IXU)


The IXU serves as a telemetry node, transferring horizontal line data to a vertical trunk line. Data for the entire 3-D spread may be retrieved from any IXU on the trunk. There are five telemetry port connectors on an IXU, these are: A (Lo), B (Hi), T1 (Down), T2 (Up) and TRUCK. Note that IXUs are arranged so that the UP port of one IXU is connected to the DOWN port of the next IXU. An IXU will detect its own position in the spread relative to the command source (CRU) and rout the command clock and Ethernet traffic accordingly.


  • Communicates with the CRU
  • Real Time Ethernet Data buffering and routing
  • Distributes timing and control to multiple lines