18-170
Chapter 18
Appendix J – Lightning &
Grounding Guidelines
The WinLink™ Lightning protection system consists of the following
components, as described below:
•
Individual Grounding for each Indoor/Outdoor unit
•
External Primary Surge Suppressor unit for the CAT-5 Outdoor
cable
•
Internal ESD protection circuits over the Power/Telecom lines
Grounding for Indoor/Outdoor Units
ODU (Out Door Unit) Grounding
WinLink™ uses a Shielded CAT-5 cable to interconnect the Outdoor
(ODU) and Indoor (IDU) units.
However, this shielding does not provide a good Lightning Discharge
path, since it can not tolerate the high Lightning Current surges.
In order to provide an alternate Lightning Discharge path, the
ODU/Antenna Grounding posts should be connected to Ground point
by a 10 AWG short Copper wire, as per NEC 810-21.
IDU (Indoor Unit) Grounding
The IDU’s grounding post should be connected to the internal Ground
point, merely for Safety and ESD protection reasons.
External Lightning Surge Suppressors
To minimize direct Lightning damages, an external well grounded CAT-5
Lightning Protector should be mounted outside the building, located as
near as possible to the entrance of the CAT-5 ODU-IDU interconnection
cable. 3
rd
pary protectors may be used such as Motorola’s 300SS,
Hyperlink’s HGLN-CAT5, or Sixnet’s SP-ETH-2
