Table of Contents
Advertisement
ABM bay grounding schemes
This chapter describes grounding schemes for an access bandwidth manager
(ABM) bay.
Note: For complete information about the grounding requirements of the
ABM bay, see "Power and ground distribution" in Site Installation
Planning and Engineering , 323-3001-200, in the Engineering,
Configuration, and Ordering Guide , Volume 1.
Grounding schemes
AccessNode equipment can be installed in a common bonding network
(CBN) or in an isolated bonding network (IBN). A CBN is the most common
grounding network used with transmission equipment.
With the use of line interface cards and external copper access lines, large
transient currents caused by certain events, such as lightning storms, and ac or
dc power line faults, can be expected to flow through the shared system
grounds. The resulting disturbances can affect AccessNode and any other
interconnected systems. Therefore, it is important that the shared grounding
scheme, involving battery leads, ac grounding, logic ground, and frame
ground, be installed correctly.
Note 1: On all external lines, first-order protection is required, as
provided by gas discharge tube or carbon block protection.
Note 2: Installation according to the NT Corporate Standard 4122.00,
"Grounding of Communication Systems," is mandatory.
The following grounding schemes are shown in this chapter:
•
Figure 2-1 on page 2-3 shows the use of CBN in central office locations
•
Figure 2-2 on page 2-5 shows the use of CBN in remote locations
•
Figure 2-3 on page 2-7 shows the use of IBN in central office locations
•
Figure 2-4 on page 2-9 shows the use of IBN in remote locations
AccessNode ABM Bay Cable Connection Quick Reference Guide Issue 1.0
2-1
2-
First, right, odd
Advertisement
Table of Contents
