QSW-4700 Series Switches Hardware Installation and Reference Guide
Preparing for Installation
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2.2.6. Lightning Protection Requirements
The external lightning protection cable row shall be used on the AC power port to prevent the
switch from being struck by lightning when the AC power cord is introduced from the outdoor and
directly connected to the power port of the switch. The port surge arrestor can be fixed with cable
ties and screws on the rack, work bench or the wall on the equipment room. When a surge
arrestor is being used, alternating current flows through the surge arrestor before entering the
switch.
Note:
•
Surge arrestors are customer supplied.
•
For details of surge arrestors, see the related user guide.
2.2.7. EMI Requirements
All interference sources, either from outside or inside of the device or application system, affect
the device by capacitive coupling, inductive coupling, or electromagnetic waves.
Electromagnetic interference (EMI) occurs due to electromagnetic radiation or conduction,
depending on the transmission path.
When the energy, often RF energy, from a component arrives at a sensitive component via the
space, the energy is known as radiated interference. The interference source can be both a
part of the interfered system and a completely electrically isolated unit. Conduction interference
occurs when interference is transferred from one unit to another unit through cables, which are
usually electromagnetic wires or signal cables connected between the source and the victim.
Conducted interference often affects the power supply of the equipment, but can be controlled
by a filter. Radiated interference may affect any signal path in the equipment, and is difficult to
shield.
•
Take interference prevention measures for the power supply system.
•
Keep the switch far away from the lightening protection and grounding system of the
power device.
•
Keep the switch far away from high-frequency current devices such as high-power radio
transmitting station and radar launcher.
•
Take electromagnetic shielding measures when necessary.
2.3. Fiber-Optic Cable Connection Requirements
Make sure the model of the SFP module and fiber-optic cable matches the SFP port. The
transmit port on the local device should be connected to the receive port on the peer device
and vice versa.
2.4. Tools
Common Tools
Phillips screwdriver, slotted screwdriver, related copper and
fiber-optic cables, bolts, diagonal pliers, cable ties
Special Tools
ESD tools
Meter
Multimeter
Note:
•
No tool kit is delivered with the QTECH QSW-4700 series switches.
