Installation Manual

Mounting the IFU Bracket
28 GHz 100 Mbps Internet IFU Installation - R1.0 3-11
Figure 3-4. Typical IFU Power Termination Wiring Schematic
IFU Power Cable Test
To ensure proper wiring, perform the input power test on both IFU power
cables prior to connecting to the IFU. This test ensures that the input power to
the IFU is between – 46 Vdc and – 56 Vdc.
To test the power cable:
WH (PA-2)
C
IFU
Alpha
Power
Cable
WH/BK (PA-4)
D
WH/BN (PA-3)
A
WH/RD (PA-1)
B
Suppressor
GND
Shield
IFU
Beta
Power
Cable
GND
Shield
F1 Conn
+
+
-
Power
Source
F1
Common Bar
F2
Common Bar
F2 Conn
Shield to
Chassis Ground
Site Equipment
Cabinet
S
u
r
g
e
S
u
r
g
e
+
+
+
+
-
-
-
-
-
-
-
White (PB-2)
Brown (PB-3)
Black (PA-4)
Red (PA-1)
White
Red
Brown
Black
++
C
D
A
B
WH (PB-2)
WH/BK (PB-4)
WH/BN (PB-3)
WH/RD (PB-1)
Chassis to
Earth Ground
Panel to
Earth Ground
- 48 Vdc
RTN
- 48 Vdc
RTN
P
r
o
t
e
c
t
e
d
P
r
o
t
e
c
t
e
d
DANGER – HIGH VOLTAGE HAZARD: Do not work
on the system or connect or disconnect cables during
periods of lightning activity, rainy weather, or both.
DANGER – L’HASARD DU TENSION ÉLEVÉ : Ne
pas travailler sur le système ni brancher ni débrancher les
câbles durant l’activité de la foudre, par de temps
pluvieux, ou tous le deux.