Browsing: OSP Expert

By Don McCarty and Vernon May We post our phone numbers at the end of every column, and we train hundreds of technicians. Therefore, we also get hundreds of calls each year asking for our help in resolving a tough case of trouble. While we often, even usually, help find the cause of the trouble, we aren’t right all the time. Following are some cases where we got it wrong. Hi Don, It has been a long time since I have” bothered” you. My 72-year-old brain is letting me down. A technical issue has come up where when we cross-connect…

By Vernon May Don and I have brought another of our disagreements to conclusion. He has always insisted that the power lines impact broadband service. My position has been that the pure harmonics of 60 Hz have so little power at the DSL frequency range that they have no impact. When compared to the background noise levels from pair-to-pair crosstalk within the binder groups, it’s next to nothing. In this case, we were both right — kind of. As we discussed what Don saw in the field and what I saw in the field, some factors previously not considered came…

From the September 2016 OSP Expert Column Our September 2016 OSP Expert column on fiber optic cable bonding and grounding, co-written by Vernon May and me (mostly Vernon’s work), caused quite a stir. The responses to the 5 questions have ranged from “finally, somebody asked these questions” to “you guys are going to get somebody killed”. (You can read this column again at http://www.isemag.com/2016/09/5-questions-about-fiber-optic-bonding-grounding-and-locating/.) Given the responses, Vernon offered to address this topic again. Here are his thoughts. September 2016 Column Summary Don and I received a question from a reader early in 2016. His position was that he completely…

Last month Vernon May and I decided to pose a few good questions on the use of the copper infrastructure to provide quality service to your customers. If you missed that column, take a look back before reading the answers below. How well did you do? COPPER INFRASTRUCTURE QUESTIONS QUESTION 1. When testing the cable pair, the digital multi-meter shows a 150 k ohm Ring ground. Using the resistance bridge feature set to 24-gauge on the technician’s multi-functional test set shows a distance to the fault of 700 feet. The cable map shows 300 feet of 24-gauge cable to a…

Together, Vernon May (a DSL trainer) and I think this last column of 2016 is a good opportunity to test your knowledge of the copper infrastructure. If you’ve read our columns regularly this year, you should have a leg up on acing this test. If you’ve taken our copper cable infrastructure and/or DSL training, you better get all the answers right! (Answers will be in the January 2017 column, and available online then, too, at www.isemag.com.) The first group of questions addresses the health of the copper infrastructure. Before installation of any service the cable pair should be tested to…

The cable pair in the copper infrastructure carries AC signals at different amplitudes in different phases at different frequencies without interference or disturbance from AC signals from other circuits on other cable pairs in the same binder group. At least this is how it is designed to work. When it doesn’t perform as it should, and the customer complains of a service interruption on any circuit, it is the job of the field technician to determine if there is a problem with the cable pair, a problem with the circuit riding on that cable pair, or if it is a…

Its Effect on Bandwidth Circuits on the Copper Infrastructure In my July 2016 column, “What Is a Good DSL Circuit?”, Vernon May mentioned 66 blocks and DSL.* Later, in a McCarty newsletter, Vernon responded to a reader question concerning 66 blocks in outside plant. In this month’s column, we will again look at the issue of 66 blocks, and the effect of series resistance on copper circuits in general. When we look at any connection of copper conductors, that connection must be 0 ohms at any frequency. Any series resistance, even as low as 5 ohms in series on paired…

One of our readers asked us this question. “What needs to be grounded in a fiber optic network?” The standard answer of “everything” seemed illogical and was unsatisfactory to him. Our research so far has yielded many more questions than answers. We want to share these questions and our impressions with our readership. Legacy Good bonding and grounding has long been an indication of quality craftsmanship in the outside plant (OSP) network. In copper cables, bad things happen if we don’t do it. •  There are safety hazards. •  The cables become susceptible to power influence and other external noise…

Vernon May and I wrote this column, and we want to let you know the topic will be discussed further by us at ISE EXPO 2016 in our seminar. So please join us in San Antonio, September 20-22. When you ASSUME…. We all know the rest of that saying. However, assumptions are a necessary part of troubleshooting and of life in general. When we leave for an appointment, we generally time it based on the assumption that our car will start and the freeway is not locked up again. Assumptions have a vital role in communications circuit trouble shooting. They…

This month’s OSP Expert is written by guest author and DSL expert Vernon May. I work with Vernon, of Vernon May Solutions, providing training and consulting services. A while ago, we began discussing the parameters for defining a good DSL circuit. We hope you find this month’s column helpful — and please, please, please, send us any follow-up questions or comments. —Don Don and I get a skewed view of the DSL troubles encountered in the field. Often, we are called in as the last resort. Therefore, we work with the most difficult troubles (and the smartest technicians). Granted, these…

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