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15.1 Before Maintaining a Crossbar Unit


15.1 Before Maintaining a Crossbar Unit
This chapter only has descriptions of the crossbar unit configuration and the work of removing and installing crossbar units.
Before removing a FRU, see "Chapter 7  Maintenance Flow" and perform the necessary work items.
For the types of maintenance on crossbar units, also see "Crossbar unit" in "Table 7-2  List of available maintenance types by FRU."