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Proprietary Information: Not for use or disclosure except by written agreement with Calix.
May, 2023.
Grounding the Unit
The u4hm must be connected to a ground system prior to putting the unit into service. The
u4hm chassis can be connected to a Common Bonding Network (CBN), Isolated Bonding
Network (IBN), or an earth ground.
A 20 AWG grounding wire (not provided) is needed to ground the unit. In the gift box, a
ring lug and phillips pan-head screw with pawl washer is provided for attaching the ring lug
to the ground post on the u4hm.
ALERT! Beware of electrostatic discharge. Follow standard ESD
precautions. Always wear a grounded ESD wrist strap to avoid damaging
the electronic equipment.
To ground the u4hm chassis
1. Cut your ground wire to the required length. Leave enough slack to account for routing
back to the earth ground. Crimp the ring lug onto the ground wire end using an
appropriately sized crimper to achieve a tight connection.
2. Connect the ground cable to the u4hm chassis as follows:
a. Position the ground cable's lug against the chassis rear panel at the ground terminal
location. Ensure metal-to-metal contact between the lug and the metal of the chassis.
b. Insert the provided ground screw with pawl washer into the chassis ground stud.
Turn the screw until fully seated. Tighten the screw to 27 in-lbs. of torque.
u4hm Ground Lug Location
3. Connect the chassis ground cable to the main ground system (best practice) or other
suitable grounding system as follows:
a. Route the ground cable to the grounding termination location. If the cable is too
long, cut the cable to length.
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