System  Concept for HIQuad X 
HI 803 211 E Rev. 1.01.00  Page 19 of 110 
  System bus interfaces on the rear side of the base rack 
Figure 5:  Example of H51X Redundancy System 
The rack IDs do not necessarily have to be arranged as described above, but they must be 
unique. 
To ensure a clearer overview, HIMA recommends the following: 
  Arrange the rack IDs in accordance with Figure 5. 
  Between the base rack and the first F-IOP module, use red patch cables for system bus A. 
  Between the base rack and the first F-IOP module, use green patch cables for system bus B.