• You must install the system ground connection with any other rack or system power ground connections
that you make. The system ground connection is required if FXS modules are installed or if this equipment
is installed in a U.S. or European Central Office.
• You must connect both the system ground connection and the power supply ground connection to an
earth ground. The system ground connection is required if FXS modules are installed or if this equipment
is installed in a U.S. or European Central Office.
• When using DC-input power supplies, you must install the system (ground before you attach the source
DC power cables to the DC PEM. Power down the chassis before attaching the system ground.
In all situations, grounding practices must comply with Section 250 of the National Electric Code (NEC)
requirements or local laws and regulations. We recommend a 6-AWG grounding wire from the chassis to the
rack ground or directly to the common bonding network (CBN). The equipment rack should also be connected
to the CBN with a 6-AWG grounding wire.
The system ground serves as the primary safety ground for chassis that is equipped with DC-input power
supplies. The DC-input power supplies for these chassis do not have a separate ground.
Note
Required Tools and Equipment
To connect the system ground, you need the following tools and materials:
• Grounding lug: When using the double-hole lug connector provided with the system, the ground wire
must be 6-AWG only. Otherwise, a supported closed-loop ring connector must be used for 8-AWG to
14-AWG wire.
• Grounding screws: One M4 x 8 mm (metric) pan-head screws. Supplied as part of the accessory kit.
• Grounding wire: Not supplied as part of the accessory kit. The grounding wire should be sized according
to local and national installation requirements. For U.S. installations, AC power supply systems require
a 14-AWG copper conductor. We recommend a commercially available 8-AWG to 14-AWG wire. The
length of the grounding wire depends on the proximity of the switch to proper grounding facilities.
• No. 1 Phillips screwdriver.
• Crimping tool to crimp the grounding wire to the grounding lug.
• Wire-stripping tool to remove the insulation from the grounding wire.
Connecting the System Ground
To establish an earth ground for the chassis, you must attach a grounding cable from the OLT grounding lug
to the rack.
Procedure
Step 1
Secure the grounding lug to the OLT with an M4 screw. Ensure that the grounding lug and the grounding
wire do not interfere with other hardware or rack equipment.
Cisco Catalyst PON Series Switches Hardware Installation Guide
26
Installation
Required Tools and Equipment
