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26 Chapter 2: Installation
Power Cords,
Grounds and Cables
PGND Wire
WARNING: The normal connection of the PGND wire is an important
guard against the lightning and interference. Therefore, the user must
first correctly connect the PGND wire before installing and using the
device.
The power input end of the Router 5000 is connected to a noise filter.
The neutral point of the noise filter is directly connected to the chassis
and is called protection ground (PGND). The PGND wire must be well
grounded, so as to safely conduct the faradism and leaky electricity to the
earth ground, and thereby improve the capability of the whole device to
guard against the electromagnetic interference. This PGND wire can also
protect the router against the lightning caused by the connection with
the external network lines, such as E1/T1 line, ISDN/PSTN line.
The grounding screw of the Router 5000, which is marked with
grounding label, is located near the AC power socket and its switch on
the rear panel of the chassis, as shown in the following figure:
Figure 10 Grounding screw of the router
(1) Power switch (2) AC input (3) Grounding terminal