User's Manual

Altai A8n (ac) Series Super WiFi Base Station

Installation Guide

The connection between the ground conductor and the earth must be

no higher than 5 ohms. This is achieved by grounding to special

grounding bars in the case of post mounting or to the steel

reinforcement bars at the concrete base of the tower in case of tower

mounting.

Grounding Plate

A grounding plate is a metal plate welded to the post or tower which

provides a common grounding connection placed at a short distance

from the equipment and ground conductor. The grounding plate is

connected to the ground conductor using a ground cable and clamp.

The A8n (ac) series base station grounding terminal is located at the

bottom of chassis compartment. This grounding terminal should be

connected to the grounding plate using a ground cable and lug. AWG

10 (around 5 mm

cross-sectional area) copper wire is recommended

for the ground cable. Only one grounding connection to the pole or

tower is allowed.

All antenna ports of A8n (ac) base station are grounded internally. For

shielded Ethernet cable (AC model) or shielded POE cable (DC model)

grounding, the ground wire of the Ethernet/ POE cable should be

connected to the screw port located at the inside bottom of lower

chassis compartment of A8n (ac) series base station. The other side of

the Ethernet/ POE cable will be 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.