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2-6 ABM bay grounding schemes
Central office IBN engineering rules
The following engineering rules and requirements apply to central office IBN
grounding schemes as shown in Figure 2-3 on page 2-7:
•
A modem is needed if the distance to the AccessNode terminal is more
than 50 ft, if the AccessNode is located in a CBN, or if the AccessNode
is in located in a different IBN.
•
The transmit DS1 cable coming from the DSX-1 cross-connect is
grounded at the DSX-1. The receive DS1 cable of the DSX-1 is grounded
at the AccessNode.
•
In small buildings the single point ground (SPG) may not exist. In such
buildings, the building point ground (BPG) will serve as the SPG.
•
In small buildings, the main distribution frame (MDF) and battery rack
are on the main floor and are connected to the SPG. In large buildings,
the MDF and battery rack are in the basement and are connected to the
BPG. Any subscriber lines that exit the building must be protected by gas
discharge protectors installed on the MDF and grounded to the SPG or
the BPG.
AccessNode P0887749 Issue 1.0
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