User Manual

MicroMAX Hardware Installation User Guide 
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Page 83 Commercial in Confidence UWB-D00068 Rev J
Note: The Grounding system must be maintained and checked periodically in
accordance with local regulations.
The Interconnecting cables shall be acceptable for external use and shall be
rated for proper application with respect to voltage, current, anticipated
temperature, flammability, and mechanical serviceability.
Hazardous network voltages are present in LAN ports regardless of whether
power to the unit is ON or OFF. To avoid electric shock , use caution when
near LAN ports. When detaching the cables, detach the end away from the
device first.
Do not work on the system or connect or disconnect cables during period of
lightning activity.
17.1.3 Surge Suppression
Surge suppression devices (LPS’s aka TVSS) all function either by absorbing the transient as
heat or forcing the transient to ground (or some combination thereof). Data line building entry
points for critical electronic equipment. Included here is Catting 5 lines, and twin lead and other
copper wire circuits.
The Lightning Protection architecture is considered, as follows:
¾ Subscriber Indoor Units connected to outdoor antennas. System, where Indoor/Outdoor
connections are via shielded CAT-5e cables that carry the baseband signals and a DC
supply voltage.
¾ The Lightning Protection System comprises grounding methods and Transient
suppression techniques (TVS).
Airspan products contain embedded Lightning Protectors at all their input ports. If additional
protection is required, for example, in high lightning activity areas, external Lightning Protectors
should be installed at strategic points at the site.
The CAT-5e shielded outdoor cable consists of twisted pair wires for Ethernet data, pair of wires
for the DC supply and pair of wires for sync. The Cable connects to the indoor unit via a grounded
Lightning Protection Box. The Lightning Protection Box is connected to an Earth Termination via a
Down-Conductor.
General Installation