Installing Generic Modules; Connecting The Pgnd - 3Com MSR 50-40 ROUTER. Installation Manual

Figure 3-2 Installing MSR 50 Series Router in a rack
(1) Mounting ear

Installing Generic Modules

Installing generic modules includes installing the main control board, PSUs, the FAN module, and FICs.
For more information about the main control board, PSUs, FAN module and their installation, refer to
Chapter 6 "Hardware Maintenance" in this manual. For more information about FICs and their
installation, refer to MSR 20/30/50 Series Routers Interface Card and Interface Module Manual.

Connecting the PGND

The normal connection of the protection ground (PGND) on the router chassis is an essential safeguard
against the lightning shocks and interference. You must correctly connect the PGND when installing or
using the router.
As shown in the following figure, the router provides a protection ground (PGND) screw at the top
right-rear of the chassis. You must securely connect it to the earth ground to safely channel faradic
current and leakage electricity to the ground and have the device less susceptible to electromagnetic
interference (EMI).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 50 Series 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:
(1)
(2)
(2) Guide
3-3