H3C SR6608/6604 Routers Installation Manual
Chapter 5 Installing the Router
5-8
5.5 PGND Cable Connection
5.5.1 Importance of the PGND Cable
Caution:
The correct connection of the protection ground (PGND) cable on the router chassis is
an essential safeguard against the lightning strokes and electromagnetic interference
(EMI). You need to correctly connect the PGND cable when installing or using the
router.
The power input end of the device is equipped with a noise filter. The neutral ground of
the power input end is directly connected to the chassis and is called PGND (also
known as chassis ground). You need to securely connect the PGND cable to the earth
ground to safely lead induced current and leakage current to the ground and reduce the
electromagnetic susceptibility (EMS) of the router. The PGND cable can also protect
the router against high lightning voltage resulting from external network lines such as
E1 line.
5.5.2 Connecting the PGND Cable
The grounding screw of the device is located on the lower right corner of the rear
chassis panel and is marked with a grounding sign, as shown in Figure 5-10.