Nebs Supplemental Unit Bonding And Grounding Guidelines - Cisco ASR 9001 Hardware Installation Manual

NEBS Supplemental Unit Bonding and Grounding Guidelines

DC power modules contain reverse voltage protection circuitry to prevent damage to the power module
Caution
if it detects a reverse polarity condition. No damage should occur from reverse polarity, but you should
correct a reverse polarity condition immediately.
For a list of the nominal and acceptable value ranges for source DC power, see
Levels, on page
NEBS Supplemental Unit Bonding and Grounding Guidelines
You must permanently connect the central office ground system or interior equipment grounding system to
the supplemental bonding and grounding connection on the side of the router chassis to meet network equipment
building system (NEBS) requirements as well as safety compliance requirements. These grounding points are
referred to as the NEBS bonding and grounding points.
The following figure shows the NEBS grounding locations for the Cisco ASR 9001 Router.
These bonding and grounding connections satisfy the Telcordia NEBS requirements for supplemental
Note
bonding and grounding connections. For an AC powered router, if you are not installing the router in a
NEBS environment, you can choose to bypass these guidelines and rely on the safety earth ground
connections to the AC power modules.
Figure 22: NEBS Bonding and Grounding Points on the Cisco ASR 9001 Router
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Cisco ASR 9001 and Cisco ASR 9001-S Routers Hardware Installation Guide
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123.
Power System DC Output
NEBS grounding point on side of chassis
Preparing for Installation