NEC Express5800/120Rh-2 N8100-1061F User Manual page 82

3-8 Setting Up Your Server
Only the inner rails remain screwed to the server when the rail assemblies have been removed.
IMPORTANT:
inner rails later. To install each rail assembly on the correct inner rail,
make a mark on the assemblies. Similarly, when installing more than
one server, distinguish between the pairs of inner rails and rail
assemblies of the servers by making marks.
The removed rail assemblies are to be installed on the
Inner rails