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Cisco ASR 901 Series Aggregation Services Router Hardware Installation Guide
OL-23778-01
Chapter 1 Introduction
Power Supply
LEDs
The Cisco ASR 901 chassis and interface modules contain LEDs to assist in troubleshooting. For more
detailed description of the LEDs, see the “
Reading the LEDs, page A-4.
Power Supply
The Cisco ASR 901 router is equipped with an internal -27/-72 volts Direct Current (VDC).
Safety Precautions
Observe the following general safety precautions and recommendations in planning the source power
requirements for the Cisco
ASR 901 router (for additional safety information, see the “Safety
Guidelines” section on page 2-1:
• 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.
• Always disconnect the power source and unplug the power cable before working on the router.
• Install proper grounding for the site to avoid damage from lightning and power surges.
Warning
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
This unit might have more than one power supply connection. All connections must be removed to
de-energize the unit.
Statement 1028
Table 1-1 lists the DC power supply specifications for the Cisco ASR 901 router.
Table 1-1 Cisco ASR 901 Router Power Supply Specifications
Specification Value
DC power supply input voltage -24/-72 VDC
Maximum input current 3 A
Wire gauge for DC input power
connections
16 AWG
Power dissipation 60 Watts