Product Info

XMI F an T r a y Assembly Chapter 7: XMI R eplacement Procedures
XMI Fan Tray Assembly
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XMI Fan Tray Assembly Description
The XMI fan tray assembly consists of five 27 V DC fans mounted in a housing. This housing is
the removable rear panel of the XMI. (See Figure 7 -4 and Figure 7 -5 .)
The fan tray assembly mounted on the rear of the XMI draws cooling air in from air vents on the
XMI front panel through the XMI and exhausts air out the XMI rear panel.
The XMI fan housing contains five fan mounting locations. Each fan mounting location has the
following:
• built -in fan grille/finger -guard
• four vibration isolator fan mounting posts
• fan connector bracket
Each individual fan has a electrical wiring and connector . The connector mounts in the
corresponding fan connector bracket.
The XMI fan tray assembly is attached to the rear of the XMI and secured with four screws.
When the XMI fan tray assembly is attached to the rear of the XMI, the five fan connectors mate
with connectors on the XMI F an Interconnect Board (FIB).
The XMI FIB provides a DC voltage connection to each fan in the fan tray assembly and is a
conduit for fan speed information and control.
The XMI P A Controller (XP AC) provides central control of the three LP A sections. In addition,
the XP AC gathers LP A alarms and provides XMI fan speed control.
System Impact/Considerations
Typically the XMI fan tray assembly replacement requires that the affected XMI be physically
removed from the UBS Macro BTS frame. However , if the rear of the frame is accessible, the XMI
fan tray assembly can be replaced without physically removing the affected XMI from the frame.
P erforming this replacement procedure on a frame with only one XMI will cause BTS
downtime and suspend call processing.
If the frame is equipped with only one XMI, BTS service will be interrupted during the XMI fan
tray assembly replacement. If the frame is equipped with more than one XMI, only the affected
XMI will be out -of -service and the BTS will remain in service.
Alarms will be reported during the replacement procedure.
7 -22 68P09283A64 -3
FOA SEP 2007