7705 SAR-8 Overview
7705 SAR-8 Installation Guide Page 49
The 7705 SAR-8 can also be used for +24 VDC operation. This requires that +24 VDC
variants of the Fan module, CSM, T1/E1 ASAP Adapter card, and Ethernet Adapter card be
installed in the chassis. The +24 VDC variants are identified by a yellow label located on the
faceplate.
The Fan module and all cards in the chassis must have the same voltage type.
The DC power LEDs are located on the Fan module (see Figure 9). Refer to Fan Module
Connectors and LEDs on page 130 for a description of the Fan module LEDs.
Refer to DC Power Connections on page 89 for requirements and information regarding
preparing DC power cables.
Fan Module
Figure 9 shows the Fan module. The Fan module provides cooling for the system, as well as
alarm indicators (LEDs), an external alarm I/O connector, and an Audible Alarm
Cutoff/Lamp Test (ACO/LT) pushbutton.
Warning: The Fan module is hot-swappable and field-replaceable by qualified personnel. It
must always be installed and fully operational while the 7705 SAR-8 is powered up. During
routine maintenance and Fan module replacement, the system can operate safely for up to
4 minutes.
Figure 9: Fan Module
FAN
Batt A
Batt B
FAN
Critical
Alarms
7705 SAR-8
ACO/LT
External
Alarms
Major
Minor
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