H3C MSR 20-20, Руководство по установке

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24 C
HAPTER
3: I
NSTALLATION
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
“Hardware Maintenance” on page 63 in this manual. For more information about
FICs and their installation, refer to
H3C MSR 20/30/50 Series Routers Interface
Card and Interface Module Manual .
Connecting the PGND
Wire
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WARNING: 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.
The power input end of H3C MSR 20 Series 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 H3C MSR 20 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:
Figure 10 Grounding terminal of the router
Use a PGND wire to connect the screw to the earth ground, and the grounding
resistance should not be greater than 5-ohm. Likewise, if the router is installed in a
19-inch standard rack, this rack is required to be grounded too.
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WARNING: When the router is in normal operation, it is required to be well
grounded. Otherwise, the router cannot reliably avoid lightning, which may
damage the router itself and even the peer device.