3-29
Cisco ASR-920-24SZ-IM, ASR-920-24SZ-M, ASR-920-24TZ-M Aggregation Services Router Hardware Installation Guide
Chapter 3 Installing
Installing the Power Supply
• The circuit breaker should be sized according to the power supply input rating and local or national
code requirements.
• The AC power receptacles used to plug in the chassis must be the grounding type. The grounding
conductors that connect to the receptacles should connect to protective earth ground at the service
equipment.
Installing a DC Power Supply
The following sections describe how to install a DC power supply in the Cisco ASR 920-24SZ-IM,
ASR-920-24SZ-M, ASR-920-24TZ-M Router:
• “Installing a DC Power Supply Module” section on page 3-29
• “Attaching Cables to the DC Power Supply” section on page 3-30
• “Removing and Replacing a DC Power Supply” section on page 3-32
Note This equipment is suitable for installation in Network Telecommunications Facilities and locations
where the NEC applies. The equipment is suitable for installation as part of the Common Bonding
Network (CBN).
Caution 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. Minimal steady state DC
operating voltage is 19.2 VDC.
Installing a DC Power Supply Module
Perform the following procedure to install a power supply module:
Step 1 Ensure that the system (earth) ground connection has been made. For ground connection installation
instructions, see the “Installing the Chassis Ground Connection” section on page 3-44.
Step 2 If present, 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.
Step 4 Grasp the power supply metal tab with one hand. Place your other hand underneath the power supply.
Slide the power supply into the power supply bay as shown in Figure 3-20. Make sure that the power
supply is fully seated in the bay.
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