7705 SAR-A Overview
7705 SAR-A Chassis Installation Guide 43
DC power can be supplied by a DC circuit or from an AC source using a separately provided
external AC-to-DC power converter. When only one power feed is used, the system does not
have power supply redundancy. Monitoring and alarms on the unused power feed can be
suppressed using the no power-feed-monitoring command; refer to the
7705 SAR OS Basic System Configuration Guide, “System Command Reference”, for
information. The power system has no field-replaceable parts.
One LED, indicating the DC power supply and alarms, is located on the front of the router.
Refer to 7705 SAR-A Connectors and LEDs for a description of the power LED operation.
Refer to DC Power Connections for requirements and information regarding preparing DC
power cables. Refer to 100W High Voltage Power Supply Connections for requirements and
information regarding AC power cables and AC power converters.
Chassis Cooling
The 7705 SAR-A chassis is equipped with fins for heat dissipation.
Maintain the following clearances around the unit:
• at least 2.5 in. (6.4 cm) at the front of the chassis for cable management
• at least 2 in. (5.1 cm) on each side of the chassis for proper airflow
• at least 1.75 in. (4.4 cm) clearance above and below the chassis for proper airflow
Warning:
• The 7705 SAR-A is designed and built to operate at a local ambient temperature
(measured within 1 in. (2.54 cm) around the unit) up to 149°F (65°C) in a vented
environment (minimum air movement of 0.5 m/s).
• The 7705 SAR-A can also operate at a local ambient temperature up to 140°F (60°C)
in a sealed environment (no air movement).
• An Overheat alarm is raised if the chassis internal temperature exceeds 203°F (95°C).
Immediate action should be taken to cool the operating environment if this occurs. If the
chassis internal temperature continues to exceed 203°F (95°C), the 7705 SAR-A
functionality can be impacted and the unit can shut down. The Overheat alarm is
cleared once the chassis internal temperature drops below 203°F (95°C).
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