H3C Technologies H3C MSR 20-2X[40] - Manual (Page 24)

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Figure 10 Installing ears on the rear panel of the MSR 20-40 Router
Installing Generic Modules
Installing generic modules includes installing the memory, ESM cards, and FICs. For more information
about the memory and ESM cards and their installation, refer to Chapter 6 “Hardware Maintenance” in
this manual. For more information about FICs and their installation, refer to MSR Series Routers Interface
Module Manual.
Connecting the PGND Cable
WARNING!
The correct connection of the protection ground (PGND) cable on the router chassis is an essential
safeguard against lightning strokes and EMI. You need to correctly connect the PGND cable when
installing or using the router.
The power input end of MSR 20 router 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 MSR 20 Router, 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: