12
When installing 2 x 11 ½-inch motherboards in a 4100U 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
expansion power supply (XPS), 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 the figure below, 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.
No Boards
Allowed
in
This Slot
PDI
4x5 Module
Expansion Power
Supply
(XPS)
4x5 Module
I/O W iring
I/O W iring
I/O W iring
4100 Option
4100 Option
4100 Option
Slot 1 Slot 2 Slot 3 Slot 4
Position
5
Position
6
Position
7 & 8
Figure 7. Installing the Motherboard in a 4100U Expansion Bay
Continued on next page
Installing Motherboards into 2975-94xx Back Boxes (4100U),
Continued
Installing into a
2975-94
xx
Expansion Bay
Block E Block G
Block F Block H
This slot cannot contain
a motherboard.
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