Submittal

0711CIMinstallF2
Typical bonding and grounding
TGB (telecommunications
grounding busbar)
TBB (telecommunications
bonding backbone)
MCBN (mesh common
bonding network)
0711CIMinstallF3
Structured ground system
The system grounding
protection starts at the
jack module with
360º shielding
The connector is then
bonded to the
patch panel
The patch panel is
bonded to the rack
with bonding screws.
Finally, the entire
system is bonded from
the rack to MCBN
located in the floor
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2
3
4
time-consuming eld-testing of alien crosstalk.
Further, the foil shields provide superior immuni-
ty to EMI/RFI and makes it dicult for unauthor-
ized users to “listen in” by providing a more-secure
data environment for such markets as government
or such applications as gaming that require strong
levels of security.
Importance of bonding, grounding
Although overall integrity of the power and
grounding system is crucial to ensure the reli-
abilityofallnetworkedequipment,thereisoen
confusion over how to properly ground and bond
shielded cabling solutions.
e primary purpose of the grounding and bond-
ing system is to create a robust path for equaliza-
tion of voltages and for resultant surge currents
to return to their source. Lightning, power-sys-
tem fault currents, circuit switching (motors on
and o), activation of surge-protection devic-
es, and electrostatic discharge (ESD) are com-
mon causes of transient voltages and electrical surges. Ground
loops are a potential disruption to data signals, and develop
when a voltage dierence occurs in the ground at each end of a
cable shield, causing a current to ow through the shield.
To realize the full performance benets of any structured
cabling system, shielded or unshielded, the overall integrity of
the bonding and grounding system must be sound. According
to standards TIA-942, ANSI J-STD-607-A, and IEEE Std 1100-
2005 (e Emerald Book), here are the principles of a properly
designed grounding and bonding system in a data center:
•Anintentionaldesign—eachconnectionmustbeengineered
and installed to properly handle the anticipated currents;
•Bondsallmetalliccomponentstotheground-
ing system (e.g., equipment, racks, cabinets, ac-
cess oors, ladder racks, cable trays, water pipes,
conduit, building steel);
•Visuallyveriableandgenerallyarrangedfor
ease of inspection and testing;
•EqualizationpathsandportsforESD-protec-
tion wrist straps;
•Supportfortheproperoperationofsurgepro-
tection device for IT equipment and power cir-
cuits;
•Electromagneticcompatibilitywithinthedata
center environment;
•Adherence to all local electrical codes, and
listed with a nationally recognized test lab.
In addition, it is recommended that complete
system bonding be observed over the entire net-
work to minimize any electrical potential dif-
ferences. Complete system bonding for any
structured cabling system exhibits the following
characteristics:
•Electricalcontinuitythroughouttherack;
•Bondsequipmentandpatchpanelstoracks/
cabinets;
This example of a telecommunications bonding and grounding system exhibits the
essential principles as well as the recommendations of the TIA-942, ANSI J-STD-607-A,
and IEEE Std 1100-2005 specifications.
Following these four steps with the Structured Ground System provides robust connections
that have low resistance, are easy to install, and are easily checked during inspections.