FTM-2
l Overview
l Features
l Ethernet Cables
l USB Cables
FTM-2
Overview 51
Features 53
Overview
The SH12 has three redundant fan modules (FTM-2s) installed at the top of the shelf
providing the necessary cooling to keep the modules within acceptable operating
temperatures. The FTM-2s pull air through the shelf — cooling the modules — and
exhaust the hot air out at the top rear. The air is vented out at the back and sides for the
ETSI application and at the rear for NEBS application of the shelf.
Figure 15: FTM-2 Faceplate
The internal air temperature in the shelf controls the rotational speed of the fans. The
internal temperature is collected by the ECM-2 from temperature probes mounted on the
different modules.
Under normal ambient conditions, the FTM-2s operate at a low rotational speed. The fan
control integrated in the CEM-2 continually monitors the status of each fan and reports
each fan status to the ECM-2. The status of a fan can also be read from the fan LED
indicator on its faceplate.
If a single FTM-2 does not work properly (such as lower speed than expected), its LED
becomes yellow and a fan abnormal alarm is raised. If an FTM-2, its LED becomes red
and a fan fault alarm is raised. In this case, one minute after fan failure, the intact fans
FSP3000 C Hardware Guide - R1.1 - Issue:A (12/09/2016) 51
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