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94 C120-H007-05EN
CHAPTER 7 Protection Against Lightning
7.2 Protection of Signal Lines
(1) External modem is in use
When modems are installed, damage to internal circuitry components in the modems
could result from indirect strike surges. Hence, it is recommended to install the
appropriate surge absorber.
Some modems are equipped with surge absorber within them. If modems are
installed, and the modem does not have surge absorber, installation of an external
surge absorber should be considered. Figure 7.3 lists recommended surge absorber.
Figure 7.3 Lighting control action when using external modem
Table 7.2 shows the recommended surge absorber.
(2) LAN connection
For the connection of outdoor LAN, optical cable should be applied as shown in
Figure 7.4 below.
Figure 7.4 Lightning control action for LAN cables
Table 7.2 Recommended surge absorber for external modem
Model Manufacture
FPZ-100-2 ⎯