Ensures Optimum Microfiber Cable Placement
MICRODRIVE CORDLESS DRILL DRIVEN
CABLE BLOWING MACHINE
October/November/December 2019 I 41
voice-frequency noise reduction. In October 2010, the
device was installed on an AT&T pair bonded U-verse
circuit in Houston where a customer was experiencing
picture freezing daily. Through July 2011, the customer
reported having no more freezing problems as a result.7
In August 2011, the unit was installed on a U-verse
circuit at the AT&T technology lab at the University of
Houston to conduct further tests, especially measuring
its effectiveness in suppressing higher frequency EMI,
such as impulse noise and induced lightning transients.
In Figure 8, before and after impulses are shown that
were induced on the circuit from an electrical storm that
passed through Houston on November 8, 2011. The top
trace is before the use of the INT and the bottom trace is
with the use of the INT. Thus, the INT is successful in
solving EMI at both low and high frequencies.
While the DSL INT can be successfully utilized
on LAN circuits for video streaming and other critical
computer networking applications, the patented design
was intended more for outside plant (OSP) installations,
such as longer cables running between buildings. A unit
for inside building LANs that might be more effective in
suppressing AXT issues does not have to handle as high
of an induced voltage-to-ground (Vg) level of suppression
as the 100 Vg patented designed DSL INT unit. It
is advised to consult with an electrical contractor or
knowledgeable ICT professional. Currently, another
design for a smaller and less expensive in-building LAN
unit is in progress for future commercial availability.
WHAT DO THE STANDARDS HAVE TO SAY?
In 1987, the IEEE first issued standard 776 on the
Recommended Practice for Inductive Coordination of Electric
Supply and Communication Lines. It was updated in
December 2018.8 Its scope states that “This recommended
practice addresses the inductive environment
that exists in the vicinity of electric power and wire-line
telecommunications systems and the interfering effect
that may be produced thereby; guidance is offered for
the control or modification of the environment and the
Maximum Micro Fiber Placement Protection
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