TPS13-001_rev1_4_A8n_series_Installation_Guide_for_FCC.doc
Commercially Confidential
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connected to indoor units via a grounded external lightning protector box. The external lightning
protector box should be located outside the building as near as practicable to the entrance of the
cables to the building and it is connected to an earth termination via a ground cable.
Earth Termination
An earth termination is a metal grounding bar which is planted into the earth for conducting and
dispersing lightning current from the ground conductor to earth. The ground conductor is
connected to this grounding bar at one end. The mounting post or tower should have its own
grounding bar. The size of metal grounding bar should be designed such that the total resistance
from the lightning rod to the earth termination is less than 5 ohms.
External Lightning Protectors
Lightning protector (or surge arrestor) is a component which provides a lower resistance path to
conduct sufficient charge from the surge in order to lower the surge voltage to a safe level.
External lightning protectors can be used to provide additional protection to the Altai A8n series
base station embedded protectors. They can be put at strategic points such as the Ethernet port,
AC power or antenna ports close to the A8n series base station. External lightning protectors are
available in the market in the form of a protector box, which can be inserted simply in front of
the ports to be protected.
As the magnitude and speed of lightning varies in different places, the specifications of external
lightning protectors should be chosen appropriately according to local protection requirements.
While this section gives a general guideline on lightning protection, the detail specifications of a
lightning protection system must be provided by local electricians and must be maintained and
checked periodically in accordance with local regulations. Altai does not provide any warranties
as to the effectiveness of the suggested measures. The implementation of the suggested
measures is at the customer’s own discretion. Under no circumstances will Altai be liable for
any consequences resulting from the implementation or lack of implementation of the suggested
measures.
