Power Source Interruptions - Cisco Catalyst 9200CX Compact Series Hardware Installation Manual

Power Source Interruptions

Note
If you use twisted-pair cable in your plant wiring with a good distribution of grounding conductors, the plant
wiring is unlikely to emit radio interference. If you exceed the recommended distances, use a high-quality
twisted-pair cable with one ground conductor for each data signal when applicable.
If the wires exceed the recommended distances, or if wires pass between buildings, give special consideration
to the effect of a lightning strike in your vicinity. The electromagnetic pulse caused by lightning or other
high-energy phenomena can easily couple enough energy into unshielded conductors to destroy electronic
devices. If you have had problems of this sort in the past, you may want to consult experts in electrical surge
suppression and shielding.
Warning
Power Source Interruptions
Systems are especially sensitive to variations in voltage supplied by the AC power source. Overvoltage,
undervoltage, and transients (or spikes) can erase data from memory or even cause components to fail. To
protect against these types of problems, power cables should always be properly grounded. Also, place the
system on a dedicated power circuit (rather than sharing a circuit with other heavy electrical equipment). In
general, do not allow the system to share a circuit with any of the following:
• Copy machines
• Air conditioners
• Vacuum cleaners
• Space heaters
• Power tools
• Teletype machines
• Laser printers
• Facsimile machines
• Any other motorized equipment
Besides these appliances, the greatest threats to a system's power supply are surges or blackouts that are caused
by electrical storms. Whenever possible, turn off the system and peripherals, if any, and unplug them from
their power sources during thunderstorms. If a blackout occurs—even a temporary one—while the system is
turned on, turn off the system immediately and disconnect it from the electrical outlet. Leaving the system on
Cisco Catalyst 9200CX Compact Series Switches Hardware Installation Guide
16
To predict and provide a remedy for strong EMI, consult experts in RFI.
The intra-building ports (Copper Based Ethernet Ports) of the equipment or subassembly is suitable for
connection to intra-building or unexposed wiring or cabling only. The intra-building ports of the
equipment or subassembly MUST NOT be metallically connected to interfaces that connect to the Out
Side Plant (OSP) or its wiring for more than 6 meters (approximately 20 feet). These interfaces are
designed for use as intra-building interfaces only (Type 2, 4, or 4a ports as described in GR-1089) and
require isolation from the exposed OSP cabling. The addition of Primary Protectors is not sufficient
protection in order to connect these interfaces metallically to an OSP wiring system.
Preparing for Installation