Cisco ASR 914 Manual page 26

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Guidelines for DC-Powered Systems

Basic guidelines for DC-powered systems include the following:

• Each chassis power supply should have its own dedicated input power source. The source must comply

• The circuit must be protected by a dedicated two-pole circuit breaker. The circuit breaker should be sized

• The circuit breaker is considered the disconnect device and should be easily accessible.

• The system ground is the power supply and chassis ground.

• Do not connect the DC return wire to the system frame or to the system grounding equipment.

• Use the grounding lug to attach a wrist strap for ESD protection during servicing.

Installing the DC Power Supply

The sections describe how to install a DC power supply in the Cisco ASR 914 Router:

Note

If the voltage feed is less than 15 V then the system will report it as 0 V.

Note

This equipment is suitable for installation in Network Telecommunications Facilities and locations where the

NEC applies.

Note

This equipment is suitable for installations utilizing the Common Bonding Network (CBN).

Note

The grounding architecture of this product is DC-Isolated (DC-I) for DC-powered products. DC-powered

products have a nominal operating DC voltage of 48 VDC.

Installing the DC Power Supply Module (A900-PWR550-D)

Procedure

Step 1

Ensure that the system (earth) ground connection has been made. For ground connection installation instructions,

see the

Step 2

If necessary, remove the blank power supply filler plate from the chassis power supply bay opening by

loosening the captive installation screws.

Step 3

Verify that power to the DC circuit connected to the power supply you are installing is off. To ensure that

power has been removed from the DC circuits, locate the circuit breakers for the DC circuits, switch the circuit

breakers to the OFF position, and tape the circuit-breaker switches in the OFF position.

Installing the Cisco ASR 914 Router

with the safety extra-low voltage (SELV) requirements in the UL 60950, CSA 60950, EN 60950, and

IEC 60950 standards.

according to the power supply input rating and local or national code requirements.

Installing the Chassis Ground Connection

Installing the Cisco ASR 914 Router

section.

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