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Proprietary Information: Not for use or disclosure except by written agreement with Calix.
May, 2023.
Sealing Cable Entry Locations
Depending on the power and network uplink options you selected, each installed u4hm unit
may terminate from one to three cables.
You must seal the cable entry location(s) to protect the interior electronics against moisture,
dust, pests, and other contaminants. Use a silicon-based sealant or comparable compound.
Note: Seal all cable entry ports immediately after installation to prevent moisture from
condensing inside the access compartment, which may cause damage. This practice is
critically important in humid regions.
To seal the cable entry port(s)
1. Verify that the access compartment cover has been re-attached to the bottom of the
u4hm chassis. See Replacing the Access Cover (on page 38) for details.
2. Very gently pull on the cable(s) to eliminate excess slack inside the entry port(s), assuring
a snug fit inside the port cutouts.
3. Apply silicone sealant to space around the cable in each entry port. If necessary, use a
finger to spread the caulk around the rubber entry hole to assure a complete air-tight seal.
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