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903-0623-00 Rev. A
Model 903 User's Guide, FMB-X-2.5 Version
2.1
Rack Configuration
Various rack widths are available, supporting different numbers of slots for card installation. Typically a
903 rack has 2 slots for video cards, 1 slot for the FMB-X-2.5, 3-4 slots for data cards, and 1 slot for a
Eurocassette PSU. Many remote racks substitute a DC-DC module on the back cover in place of the
Eurocassette PSU to reduce the width of the rack by 8 HP (4 HP = 0.8" or 20.3 mm). The remote rack
usually has a wire pigtail for applying AC or DC power; the console rack generally has a front panel
switch and an IEC-320 jack on the rear cover to support a variety of plug cables. Console modules can be
provided in full 19" racks or as reduced width sub-racks with add-on flanges for installation in 19" racks.
Slots in each rack are referenced by letter, per the installation drawings. Slots A and B are 4 HP wide and
are intended for video cards, slot C is an 8 HP slot for the FMB-X-2.5, slot D and above are typically 4 HP
wide data slots with the exception of the last slot, which is usually 8HP for the power supply module. The
console module usually includes an additional panel for the power switch.
Some racks include one or two slots dedicated for media converter cards. These slots provide only power
at the backplane connectors, since the media converters do not require any backplane data lines. Media
converters may also be installed in data slots, which in this case the backplane data lines are unused.
Optical expansion cards, such as CWDMs may be installed in any video, data or media converter slot.
Refer to installation drawings 903-8XXX-XX for the actual as-built rack configuration.
Focal Technologies Corp.
Page 2-2
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