Issue link: https://www.e-digitaleditions.com/i/1156106
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 suppres- sion 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 recom- mended 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 Speeds up to 79 m/min (260 ft/min) into 5 to 18 mm (.19 to .63 in.) OD microduct — ergonomic controls allow one-person operation 2.5 to 11 mm (.09 to .43 in.) microfiber cable O.D. Generator available for areas with unreliable power Portable size for easy maneuverability Now "Flat Drop" Compatible +1.215.357.5500 GMPtools.com THE GMP AIRSTREAM MICRO CABLE BLOWING MACHINE Maximum Micro Fiber Placement Protection GM6284ADB.QXD_Layout 1 3/13/17 1:18 PM Page 1 Compact size and portable maneuverability for ease of handling Speeds up to 90 m/min (300 ft/min) into 8.5 & 12.7 mm (.335 & .500 in.) OD Microduct — rollers are powered by a cordless drill (most types) Battery-powered speed and distance monitor 2.6 - 5.0 mm (.102 - .196 in.) OD Enterprise Based Air Blown Fiber +1.215.357.5500 GMPtools.com MICRODRIVE CORDLESS DRILL DRIVEN CABLE BLOWING MACHINE Ensures Optimum Microfiber Cable Placement GM6355ADB.QXD_Layout 1 12/22/18 11:24 AM Page 1