Grounding connections – Cisco XR 12406 User Manual
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Cisco XR 12406 Router Installation Guide
OL-13831-01
Chapter 2 Preparing for Installation
Installation Site Requirements
Grounding Connections
Before you connect power or turn on your Cisco XR 12406 Router, you must
provide an adequate system ground for the router. The equipment grounding
should be in accordance with local and national electrical codes.
For installations other than in a network equipment building system (NEBS)
environment, you may chose to rely on the safety earth ground connection
supplied via the International Electrotechnical Commission (IEC) 320 inlets for
AC-powered units and the main terminal block ground connection for
DC-powered units.
•
On Cisco XR 12406 Routers configured for AC-input operation, the AC PDU
is equipped with two three-wire electrical grounding-type connectors that
accept three-wire, grounding-type AC power cords such as the power cords
shipped with the router. This is a safety feature.
•
On Cisco XR 12406 Routers configured for DC-input operation, the DC PDU
is equipped with two DC power connector blocks, each with wire-connection
terminals for connecting the negative lead (top terminal), the positive lead
(middle terminal), and the ground lead (bottom terminal). This is a safety
feature.
Note
The Cisco XR 12404 Router grounding architecture conforms to the
DC-I (DC-isolated) method of grounding as described in Telcordia
GR-1089-CORE. A DC-I architecture means that there is no connection
between the DC return terminal and the frame ground. DC return and
frame ground are isolated from one another at the router.
If the router is installed in a NEBS environment, we strongly recommend that you
connect the central office ground system or interior equipment grounding system
to the supplemental bonding and grounding point on the router chassis. This
grounding point consists of three threaded inserts is located on the side of the
chassis near the back of the chassis (
). It is also referred to as the NEBS
bonding and grounding receptacle, and is intended to satisfy the Telcordia NEBS
requirements for supplemental bonding and grounding connections.