Figure 3-3 Mixed Grounding System; Table 3-1 Ground Point Descriptions For Mixed Grounding - Cisco MGX 8230 Installation And Configuration Manual

Chapter 3 Site Preparation
Figure 3-3
–
Battery A
–
Battery B
Table 3-1
Connection
Z1
Z2
Z3
Z4
Z5
B
1, 2, 3, 4
T
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Mixed Grounding System
– 48V-A
Z1
Z2
+
Z1
Z2
B
Z2
Z1
– 48V-B
+
Z1
Z2
B
Ground Point Descriptions for Mixed Grounding
Description
–48 VDC return.
Protective earth or safety ground (green/yellow).
Equipment ground for non isolated equipment.
Equipment ground for isolated equipment.
Equalizing frame ground. This ground creates low-impedance equalization
between frames.
Battery ground.
Connection points to the building's ground system: a potential can exist between
these points within the ground system.
Common-mode EMI filters.
– 48V-A
T
– 48V-A RTN
Safety Ground
– 48V-B
T
– 48V-B RTN
Safety Ground
Z3
3
– 48V-A
T
– 48V-A RTN
Safety Ground
– 48V-B
T
– 48V-B RTN
Safety Ground
Z4
4
Cisco MGX 8230 Edge Concentrator Installation and Configuration
Power and Grounding
Non-isolated equipment
– 48V-A logic power
– 48V-B
1
1
Isolated equipment
– 48V-A logic power
– 48V-B
2
2
Z5
3-19