Sun Microsystems 6.0005E+11 - Manual (Page 39)

Product Overview 1-5
1
Figure 1-5 Enterprise 4000 System
1.2 Basic Definitions
Ultra Enterprise server systems use a centerplane. Electrical traces embedded
in the centerplane serve both the front and rear sides of the centerplane;
therefore, the orientation of the sockets on the rear of the centerplane is
opposite the orientation of sockets on the front of the centerplane.
Boards in the front of the card cage are installed component side down, and
boards in the rear of the card cage are installed component side up. Similarly,
the orientation of the power/cooling modules installed in the rear of the
system chassis is opposite the orientation of power/cooling modules in the
front of the system chassis.
Since boards, modules, and power/cooling modules may be located on either
side of the Enterprise server chassis centerplane, the terms “front,” “rear,”
“right,” and “left” are defined in Table 1-1.
Front Rear