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Cisco MGX 8950 Hardware Installation Guide
Release 3, Part Number 78-14147-02 Rev. A0, November 2002
Appendix C Earthing and Bonding Recommendations
EC [3] Definitions
Figure C-1 shows examples of star and mesh topologies.
Mesh-IBN A type of IBN in which the components of the IBN (equipment
frames) are interconnected to form a mesh-like structure. This
may, for example, be achieved by multiple interconnections
between cabinet rows or by connecting all equipment frames to
a metallic grid (bonding mat) that extends away from beneath the
equipment. The bonding mat is, of course, insulated from the
adjacent CBN. If necessary the bonding mat could include
vertical extensions that result in an approximation to a
Faraday-cage. The spacing of the grid depends upon the
frequency range of the electromagnetic environment.
Star IBN A type of IBN comprising clustered or nested IBNs sharing a
common SPC.
System block All the equipment whose frames and associated conductive parts
form a defined BN.
Isolated DC return (DC-I) A DC power system in which the return conductor has a single
point connection to a BN. More complex configurations are
possible. (See the “
Bonding Networks” section in this
appendix.)
Common DC return (DC-C) A DC power system in which the return conductor is connected
to the surrounding BN at many locations. This BN could be
either a mesh-BN (resulting in a DC-C-MBN system) or an IBN
(resulting in a DC-C-IBN system). More complex configurations
are possible. (See the “
Bonding Networks” section in this
appendix.)