Installing into a 2975-94xx Expansion Bay
When installing 2 x 11 ½-inch motherboards in a 4100U/4100ES expansion bay, adhere to the following guidelines:
• Each expansion bay assembly includes a chassis, two end supports, one LED/switch frame, and a power distribution interface (PDI) board.
• An expansion bay holds up to eight 4" x 5" modules. A double-size module, such as the the ES-XPS/ES-PS or XPS in legacy systems, takes up
two blocks of space as shown below.
• Up to seven 2" x 11 ½" motherboards can be installed in an expansion bay if no 4" x 5" modules are installed in the bay. Motherboards
are mounted on top of the PDI in expansion bays. The data and power that would normally be bussed via the PDI is instead routed across the
boards via ribbon cable from one board to the next.
• As shown in Figure 8, motherboards can be installed alongside 4" x 5" cards, if necessary.
• The leftmost slot must not contain a motherboard.
• 4" x 5" cards must be added from right to left.
• Motherboards must be added from left to right.
Figure 8: Installing the Motherboard in a 4100U/4100ES Expansion Bay
page 8 579-205 Rev. H
4010ES and 4100 4120-Series Class A/Class B Zone Modules Installation Instructions
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