9 PDPs
Failure Indicator
The lightning protection module is equipped with a failure indicator LED. OFF
indicates normal status and solid red indicates failure.
Precautions for Replacing the Lightning Protection Module
Avoid replacing the module when it is powered as much as possible. However,
when you have to do so, use a screwdriver wrapped with insulating tapes.
9.4.6 PDP Power Cable
The PDP power cables are used to introduce an external -48 V power supply to the
PDP inside the cabinet. One end of the cables is connected to the power distribution
cabinet in the equipment room and the other end is connected to the PDP at the top
of the cabinet.
Structure
Table 9-10 shows the power cables for the PDP (3000068).
Table 9-10 Power Cables for the PDP (3000068)
Power Cable Type
Illustration
Mappings Between Cable Diameters
and Lengths
-48 V (16 mm
2
)
-48 V (25 mm
2
)
-48 V (35 mm
2
)
u For a power cable shorter than 20 m,
the one with a cross-sectional area of
16 mm
2
is recommended.
u For a power cable that is 20 m to 35
m long, the one with a cross-sectional
area of 25 mm
2
is recommended.
u For a power cable that is 35 m to 50
m long, the one with a cross-sectional
area of 35 mm
2
is recommended.
Note: The diameter of the PDP power
cable depends on the cable length and
the current actually carried by the PDP,
and hence should be determined
according to the project configuration.
0 V (16 mm
2
)
0 V (25 mm
2
)
0 V (35 mm
2
)
Version: B
129
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