Installing Mim Modules; Connecting The Pgnd Wire - 3Com 5000 Series Installation Manual

3Com Router 5000 Family
Installation Guide
1) Mounting ear
Figure 4-2 Installing the router in a rack

4.3 Installing MIM Modules

4.4 Connecting the 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 3Com 5000 Routers 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 3Com 5000 Routers, which is marked with grounding label, is
located near the AC power socket and its switch on the rear pannel of the chassis, as
shown in the following figure:
2) Guide
3Com Corporation
4-3
Chapter 4 Installation of the Router