System Grounding Connection Guidelines; Site Wiring Guidelines - Cisco GSR12/60 - 12012 Router -AnyLAN, SONET/SDH Installation And Configuration Manual

System Grounding Connection Guidelines

Before you connect power or turn on your Cisco 12012, we strongly recommend that you
provide adequate system ground for your router. System grounding (earth) receptacles are
provided on the Cisco 12012. The grounding receptacles are located between the air filter
tray and the power supply bays, on the card cage assembly mounting flange. To ensure the
system grounding connection that you provide is adequate, you will need the following
parts:
•
Two grounding lugs—Must have two M6 screw holes that have 0.625–0.75-inch
(15.86–19.05-mm) spacing between them. The lug is similar to the type used for the
DC-input power supply leads. (See Figure 2-3.) This grounding lug is not available from
Cisco Systems; electrical-connector vendors, such as Panduit, provide this type of lug.
•
Four hex-head screws with locking washers—M6 (metric). These screws are not
available from Cisco Systems; they are available from any commercial hardware
vendor.
•
Two grounding wires—4 AWG recommended. The length of the wire depends on your
router location and site environment. This wire is not available from Cisco Systems; it
is available from any commercial cable vendor.

Site Wiring Guidelines

Following are guidelines for setting up the plant wiring and cabling at your site. When
planning the location of the new system, consider the distance limitations for signaling,
electromagnetic interference (EMI), and connector compatibility, as described in the
following sections.
When wires are run for any significant distance in an electromagnetic field, interference can
occur between the field and the signals on the wires. This fact has two implications for the
construction of plant wiring:
•
Bad wiring practice can result in radio interference emanating from the plant wiring.
•
Strong EMI, especially when it is caused by lightning or radio transmitters, can destroy
the signal drivers and receivers in the Cisco 12012, and can even create an electrical
hazard by conducting power surges through lines and into equipment.
Site Requirement Guidelines
Preparing for Installation 2-15