Specifications

DXP Correspondence Manual
Installing The DXP
3.7
Ins falling
The
Boards
As part of your pre-installation work, you will have made sure that all
of your boards were fully functional. So you can now go ahead and
start installing them.
.
When you work with any of the boards, always wear a static discharge
wrist strap and work in a static-safe work area. Do not remove the
board from its static-protected bag until you are in a static-safe area
(for information on electro-static discharge, see IMIO1-005, Handling
of Electrostatically Sensitive Components). When installing any board
into the DXP, push only on the tabs on the outer edges of the board.
Board Locations
Labels appear under each slot on the front edge of the cabinets,
indicating which board should go in the slot, and the boards are
mechanically keyed to fit only in the correct slots.
When inserting circuit boards, orient them so that they line up with the
top and bottom guides on the card cage. Keep in mind that the boards
fit snugly into the slots. Slide the boards into the card cage until the
connector on the back edge of the board properly mates with the
connector on the backplane.
If you suddenly encounter resistance while inserting a board into the
card cage, do not try to force the board into place.
Keep in mind that Universal/Auxiliary 1 and Universal/Auxiliary 2 are
the only two slots in the entire system, including the expansion
cabinet, that hold an auxiliary board.
Using The Pre-power jack
The services, CPU, and auxiliary boards all have to be installed with
the power off; line and station boards have pre-power jacks that allow
you to install them while the system still has power. The pre-power
jack is typically for when you are adding board into an existing system
and you don’t want to disturb the customer’s service. If you’re
installing a new system, there’s no need to keep the power on.
If you ever insert a station, line, or interface board while the DXP
system is on, make sure to prepower the board first to prevent a power
surge to the board or to the system. You must prepower the system
before the board makes contact with the backplane.
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Use the standard telephone handset coil cord supplied with the
main cabinet and connect one end of the cord to the prepower
jack on the main cabinet’s power supply unit and the other end
to the prepower jack on the board. Simply making the
connection prepowers the board. The LED on the board will
flash to indicate that the board has been pre-powered.
Installing The DXP 3 - 7