8.0 Installation And Operation; Mounting; Figure 8-1: Example Model 907 Remote Stack View - Focal 907 User Manual

907-0601-00 Rev. C Model 907 Video/Data Multiplexer – User's Guide

8.0 Installation and Operation

8.1

Mounting

Model 907 cards use the standard PC/104 form factor of 3.55 × 3.775 inches (90 × 96 mm). The cards are
outfitted with a PC/104 keyed connector to provide backplane connectivity between multiple cards assembled
in a vertical stack. Note that this connector, as used by the Model 907 system, has a proprietary pin-out that is
not compatible with commercial PC/104 cards. Adaptor Card 907-PC104 (See Section 6.2) must be used if
directly connecting Focal cards to a standard PC/104 stack.
Cards stack one on top of the other, supported by standoffs fitted into mounting holes on the corners of the
card, and electrically connected via the PC/104 connector, as shown below in Figure 8-1. Model 907
motherboard cards have short-pin (female only) PC/104 connectors, and are typically mounted on the bottom
of the stack, whereas Model 907 expansion cards have both female and male PC/104 connector interfaces
that allow them to be stacked on top of the motherboard and each other. The standoff height between cards is
typically 0.625"; however, the 907-GBE card is an exception. Between this card and the card stacked just
above it, 0.75" standoffs are required. For information on other exceptions refer to the installation drawing.

Figure 8-1: Example Model 907 Remote Stack View

Some stack configurations require fiber pigtails to optically connect one card to another. When mounting,
disassembling, or reassembling the cards, ensure that no fibers are subjected to bends in excess of those
held by the natural routing of the fibers. The minimum bend radius of the fibers should generally be no less
than 25 mm, though single partial bends may be less than this – as low as 15 mm – without damaging the
fiber. Allowable long term values for bend radius are dependent on the fiber type and environment. Avoid
even temporary bends with a radius less than 15 mm, which may affect the long-term reliability of the fiber.
The system installer must account for fiber loops and connectors protruding from the edges of the PC/104
form-factor when considering the internal dimensions of any enclosure surrounding the stack. Space must
also be allowed for mating cables/connectors for video and data signals. Installation drawings typically show
recommended "keep out" areas to allow for optical and copper cabling.
Focal Technologies Corp. Page 8-1