General Grounding Rules For Ibn And Cbn Topologies - Nortel Passport 15000 Preparation Manual

156 Chapter 4 Power and grounding preparation

General grounding rules for IBN and CBN topologies

241-1501-205 5.2S2
The recommended configuration for IBN bonding topologies is that the
power feed only IBN equipment. The following rules apply:
• There must be only one single point ground (SPG) for all equipment fed
from the power plant.
• All communication equipment must be within one floor of the system
SPG.
• Insulate the battery return (BR) bar of the power plant from the power
plant framework.
• The BR must be connected to the SPG by a battery return reference
conductor.
• The framework of the power plant must be bonded to the FGB of the
floor where the power plant is located.
• Grounding conductors must not carry current under normal operating
conditions.
If both IBN and CBN equipment must receive power from a common power
plant, then the configuration must be restricted to applications such as small
CB entities co-located with an IBN switch. In this case, the following rules
apply:
• The SPG for all IBN equipment fed from the power plant must be a non-
current carrying section of the insulated battery return bar of the power
plant.
• All IBN equipment must be within one floor of the power plant.
• The battery return bar of the power plant must be insulated from the
framework and bonded to the FGB.
• The framework of the power plant must be bonded to the FGB.
For an European Telecommunications Standards Institutes (ETSI) topology
using mesh-BN, the optional hardware kit is A0834149, which can be ordered
with the Passport 15000 or 20000 or added later. These rules apply:
• the frame ground (FG) of each cabinet is bonded to the local CBN
• the logical return (LR) is bonded to the FG at each cabinet