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Guidelines for DC-Powered Systems
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.
Guidelines for AC-Powered Systems
Basic guidelines for AC-powered systems include the following:
• Each chassis power supply should have its own dedicated branch circuit.
• The circuit breaker should be sized according to the power supply input rating and local or national code
• The AC power receptacles used to plug in the chassis must be the grounding type. The grounding
Installing the DC Power Supply
The following sections describe how to install a DC power supply in the Cisco ASR 907 Router:
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
Perform the following procedure to install the power supply module:
Cisco ASR 907 Router Hardware Installation Guide
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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.
requirements.
conductors that connect to the receptacles should connect to protective earth ground at the service
equipment.
Installing the Cisco ASR 907 Router
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