CONVERGED INFRASTRUCTURE
• Using higher category cables that have a larger cross
sectional area copper wires that will improve current
carrying capacity and reduce temperature rise. Shielded
cables also perform better in terms of heat dissipation
than unshielded
• Co-mingling of powered and unpowered cables with
unpowered at the core of bundles
Designing network cabling for optimum performance with
PoE doesn’t stop at cabling. The RJ45 was not originally
designed to pass current. Consequently this is a point of
weakness as higher current PoE++ has the potential to
damage RJ-45 connectors over time where there’s going to
be repeated connector mating cycles. Connectors with an
all-metal body construction (instead of ABS plastic) will help
to improve heat dissipation, and gold plated connector tines
should always be used as specified by ANSI/TIA-1096-A
/ IEC60603-7 and ANSI/TIA-568C.2 / ISO/IEC 11801
standards.
Mitigation is possible by using connectors with tine
design to minimise arcing at the fully mated contact
area. Connectors should also meet the contact resistance
requirements of IEC 60512-99-001 standard on connectors
for electronic equipment. Only review of connector data
sheets will confirm if it’s suitable.
39
Driving deployment
The great thing about PoE is that existing infrastructure,
for the most part is totally suitable for PoE without any
modification. However, as devices and network switches
are upgraded to higher power versions there is a risk that
the expected results may not be achieved. This can be
due to a number of reasons some of which are described
above. PoE++ and UPOE use all four pairs, and many legacy
installations that have not previously deployed Gigabit
Ethernet will have only previously used two pairs for data.
Furthermore, as a result of either poor termination or low
quality cable, DC Resistance Unbalance between pairs can
have consequences for data performance. DC Resistance
Unbalance is specifie d in the IEEE PoE standard but not in
TIA/IEC field testing requirement. Pair to pair resistance
unbalance is a potential source of problems, and testing
is recommended where higher powered PoE is likely to be
deployed.
One thing is sure: PoE is becoming ubiquitous with many
devices now compatible. Smart buildings and IoT growth
will drive deployments. For new installations, it’s important
that companies adhere to standards and use the most
appropriate cabling and connectivity. This will ensure system
longevity, minimising temperature increases and optimising
performance. n
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