• 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
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.
Note
Installing the DC Power Supply Module
Perform the following procedure to install the power supply module:
Step 1 Ensure that the system (earth) ground connection has been made. For ground connection installation instructions, see
Installing the Chassis Ground Connection.
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.
Step 4 Grasp the power supply handle with one hand. Place your other hand underneath the power supply, as shown in the figure
below . Slide the power supply into the power supply bay. Make sure that the power supply is fully seated in the bay.
Figure 74: Installing the DC Power Supply
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
98
Installing the Cisco ASR 903 Router
Installing the DC Power Supply
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