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C-5
Cisco MGX 8950 Hardware Installation Guide
Release 3, Part Number 78-14147-02 Rev. A0, November 2002
Appendix C Earthing and Bonding Recommendations
Bonding Networks
Figure C-1 Star and Mesh Topology Examples
Bonding Networks
Bonding and earthing are accomplished through the construction and maintenance of Bonding Networks
(BNs), which are connected and grounded to earth. In this appendix, BN refers to Common Bonding
Networks (CBNs), Mesh-BNs (MBNs), and Isolated Bonding Networks (IBNs) collectively. The
acronym BN implies that a connection to earth exists.
The purpose of a BN is to shield people and equipment from the adverse effects of electromagnetic
energy from DC to low RF range. Lightning and both AC and DC power faults are the energy sources
that cause the greatest concern. Of less concern are quasi-steady-state sources such as AC power
harmonics and function sources, such as clock signals from digital equipment.
Mesh configurationStar configuration
Not applicable
Rack, equipment, module, etc.
Bonding conductor
Nearby elements of CBN
Connection to CBN
BN Bonding network
CBN Common bonding network
IBN Isolated bonding network
SPCW Single point connection window
Mesh-IBNStar-IBN SPCW
Mesh-BN
SPCW
May be of
zero length
Integration of the BN into the CBN
Multiple point Single point
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