Juniper PTX10008 Hardware Manual page 152

Table 50: Site Electrical Wiring Guidelines
Site Wiring Factor
Signaling limitations
Radio frequency interference
(RFI)
Electromagnetic compatibility
(EMC)
WARNING:
connection to intrabuilding or unexposed wiring or cabling only. The intrabuilding port(s)
of the equipment or subassembly MUST NOT be 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), 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
Guideline
To ensure that signaling functions optimally:
Install wires correctly.
Improperly installed wires can emit radio interference.
Do not exceed the recommended distances or pass wires between buildings.
The potential for damage from lightning strikes increases if wires exceed
recommended distances or if wires pass between buildings.
Shield all conductors.
The electromagnetic pulse (EMP) caused by lightning can damage unshielded
conductors and destroy electronic devices.
To reduce or eliminate the emission of RFI from your site wiring:
Use twisted-pair cable with a good distribution of grounding conductors.
Use a high-quality twisted-pair cable with one ground conductor for each data
signal when applicable, if you must exceed the recommended distances.
Provide a properly grounded and shielded environment and use electrical
surge-suppression devices.
Strong sources of electromagnetic interference (EMI) can cause the following
damage:
Destruction of the signal drivers and receivers in the device.
Electrical hazards as a result of power surges conducted over the lines into the
equipment.
TIP: If your site is susceptible to problems with EMC, particularly from lightning
or radio transmitters, you might want to seek expert advice.
The intrabuilding port(s) of the equipment or subassembly is suitable for
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