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C-10
Cisco MGX 8800/8900 Series Hardware Installation Guide
Releases 2 - 5.2, Part Number OL-4545-01, Rev. H0, May 2006
Appendix
Bonding and Grounding the Cisco MGX System
Figure C-2 Mixed Grounding System
Table C-1 Ground Point Descriptions for Mixed Grounding
Connection Description
Z1 –48 VDC return.
Z2 Protective earth or safety ground (green/yellow).
Z3 Equipment ground for non-isolated equipment.
Z4 Equipment ground for isolated equipment.
Z5 Equalizing frame ground. This ground creates low-impedance equalization
between frames.
B Battery ground.
1, 2, 3, 4 Connection points to the building’s ground system: a potential can exist
between these points within the ground system.
T Common-mode EMI filters.
Battery A
Nonisolated equipment
– 48V-A
T
– 48V-A
– 48V-A
logic power
+–
– 48V-B
1
1
B
2
B
T
T
Safety ground
Safety ground
Safety ground
– 48V-A RTN
– 48V-A
– 48V-A RTN
– 48V-B
– 48V-B RTN
– 48V-B
– 48V-B RTN
Safety ground
Battery B
– 48V-B
+–
Isolated equipment
– 48V-A logic power
– 48V-B
2
4
T
Z1
Z1
Z1
Z1
Z2
Z2
Z2
Z2
Z3
3
Z4
Z5
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