Simplex VESDA 4100 Series Installation Instructions Manual page 11

Installing Motherboards into 2975-94xx Back Boxes (4100U/4100ES),
Continued
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
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 Figure 7, 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.
FigureTag FD4-050-03
Slot 1 Slot 2
PDI
No Boards
Allowed
in
This Slot
This slot cannot contain
a motherboard.
Figure 7. Installing the Motherboard in a 4100U/4100ES Expansion Bay
Position
Block E
Slot 3 Slot 4
I/O Wiring
4x5 Module
4x5 Module
I/O Wiring
Position
Block F
11
Position
Slots 7 + 8
5 7 & 8
I/O Wiring
Expansion Power
Supply
(XPS)
6
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