User's Manual

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Check the power at your site before router installation (and periodically after installation) to ensure clean
power (free of spikes and noise) is being received.
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Always disconnect the power source and unplug the power cable before working on the router.
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Install proper grounding for the site to avoid damage from lightning and power surges.
To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to telephone-network
voltage (TNV) circuits. LAN ports contain SELV circuits, and WAN ports contain TNV circuits. Some
LAN and WAN ports both use RJ-45 connectors. Use caution when connecting cables. Statement 1021
Warning
There is the danger of explosion if the battery is replaced incorrectly. Replace the battery only with the
same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the
manufacturer's instructions. Statement 1015
Warning
Environmental Monitoring Temperature Sensor
The Cisco ASR 901S Series Aggregation Services Routers has a temperature sensor to detect over temperature
conditions inside the chassis. The over temperature detection trips at 158°F (70°C). This condition is reported
to the processor as an interrupt, where the software generates the appropriate alarms. If the router reaches a
temperature of 181.4°F (83°C), the power supply cycles itself to prevent the router from exceeding the
maximum temperature while being powered up.
The following table provides the over temperature alert settings.
WarningThresholdDescription
Enabled181.4 to -40°F (83 to -40°C)Board temperature
Enabled181.4 to -40°F (83 to -40°C)Inlet temperature
Enabled181.4 to -40°F (83 to -40°C)CPU temperature
For environmental specifications, see table 8 in
Product Specifications, on page 72.
External Connections and Chassis Cable Ports
When connecting the router internal ports to external cables or exterior devices, the router cables must be
threaded through the chassis cable ports designated for this purpose. Some chassis ports are reserved for
specific cables and remaining ports can be used based on the network configuration and cabling requirements.
For details about the interfaces, see
Cisco ASR 901S Series Aggregation Services Router: Top and Bottom
View, on page 5.
The cable connectivity can be provided as follows:
Cisco ASR 901S Series Aggregation Services Router Hardware Installation Guide
10 OL-29732-01
Introduction
Environmental Monitoring Temperature Sensor
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