User's Manual Part 3

LIGHTNING ROD
EARTH LINE
ODU
FG
EARTH LINE*
COAXIAL CABLE
INDOOR EARTH
GROUND
LEVEL
IDU
(Grounding-resistance:
less than 10 ohms)
Notes:* NEC recommends that frame ground of ODU should be connected to earth line as NEC’s
standard installation.
EP : Earth Ground Point of tower
FG : Frame Ground terminal of the IDU (5 mm square cable (means more than 2.5 mm
diameter cable (AWG #10) is recommended to apply for the earth grounding. The proper
press fix terminal tool shall be used.)
This connection is an exam
p
le.
ISOLATED FROM
TOWER
(Grounding-resistance:
less than 10 ohms)
(Grounding-resistance
of tower: less than
Grounding cable for ODU should be
connected to the nearest EP of the tower.
EP
LINE
It lets through the center of the steel
tower as much as possible.
The coaxial cable lets through the inside of the steel tower.
The earth between ODU-IDU lets through the inside of the
steel tower.
COAXIAL CABLE
EARTH LINE
This is the buried earth wire.
This type of wire is not an in-
sulated winding wire and
recommends to make a na-
ked wire.
10 ohms)
Use a copper grounding conductor to ground the rack.
The grounding conductor to the CO GND be connected to the rack.
TOWER
INSTALLATION ROI-S05750
2-112
Fig. 2-11 Connection for Frame Grounding (2/2)