Juniper mx240 Hardware Manual page 480

MX240 3D Universal Edge Router Hardware Guide
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metallically connected to interfaces that connect to the OSP or its wiring.
These interfaces are designed for use as intrabuilding interfaces only (Type
2 or Type 4 ports as described in GR-1089-CORE, Issue 4) and require isolation
from the exposed OSP cabling. The addition of primary protectors is not
sufficient protection to connect these interfaces metallically to OSP wiring.
General Safety Guidelines for Juniper Networks Devices on page 413
General Safety Warnings for Juniper Networks Devices on page 414
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