Dms-100 Family; Dms Single Point Ground (Dms Spg); Floor Ground Bar (Fgb); Framework Bonding Bar (Fbb) - Nortel DMS-100 Series Maintenance Manual

1–2 Introduction
reinforcing rods, metallic plumbing, ac power conduit, ac equipment
grounding conductors, bonding conductors, and cable racks. The CBN is a
mesh topology and is connected to the building grounding electrode system.

DMS-100 Family:

Designates the family of digital multiplexed switching systems which
include the DMS-100, DMS-100/200, DMS-100 switching cluster,
DMS-100 switching network, DMS-200, DMS-250, and DMS-300.

DMS single point ground (DMS SPG):

A single point where the framework bonding equalizer (FBE), the logic
return equalizer (LRE), the serving ac equipment grounds (ACEG), the
integrated collector bar (ICB), and the serving dc-power plant battery return
reference (BRR) are connected to ground. The DMS SPG is usually one of
the following types of busbars: building principal ground (BPG), floor
ground bar (FGB), dedicated SPG bar, or a dedicated section of the serving
dc-power plant battery return (BR) bar. In non-ISG configurations, the
framework ground bus (rather than the FBE and LRE) is connected to the
DMS SPG.

floor ground bar (FGB):

A copper bar on each floor of a building provided for equipment grounding.
The FGB is connected to the VGR and effectively extends the BPG to each
floor level.

framework bonding bar (FBB):

A copper bar used for bonding a DMS-100 frame to the FBE. The metal
framework of each DMS frame is bonded to an FBB horizontally mounted
above the frame.

framework bonding equalizer (FBE) bar:

A copper plate mounted on insulators and used in an ISG DMS system to
bond DMS frames to ground. The FBE is preferably located close to
PDC-00 and the equipment frames, and has a single connection to the DMS
SPG. One Framework Bonding Bar (FBB) in each lineup is connected to
the FBE. No other conductors are connected to the FBE.

framework ground bus:

A copper plate mounted on insulators and used in a non-ISG DMS system
to provide ground reference to DMS frames. The framework ground bus is
preferably located close to PDC-00 and the equipment frames, and has a
single connection to the DMS SPG. It is the start and end point of a ground
loop formed with conductors that interconnect the FBB of all the PDCs in
297-1001-350 Standard 02.02 August 1997