OSP Expert: Don McCarty

What Is a Good DSL Circuit?


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…

Transporting 3 Totally Different Circuits on the Same Copper Cable Pair


DSL and IPTV were introduced by handing the technicians a test set and watching for pass/fail like we did in the POTS environment. Sixteen years after the advent of DSL, problems in provisioning and maintaining these circuits still persist that were caused by this practice. The biggest myth is: if the circuit is properly designed and is free of DC type faults with good bonding and grounding and is within the reach for that particular POTS, DSL, or IPTV service, then that individual service should function properly. There is a bit more to it. I have preached this constantly: Many…

The Value of Longitudinal Balance in DSL Circuit Evaluation


As we are writing this column, both Vernon May (a bandwidth expert) and I are training together on a combination DSL – cable fault locating course in Tennessee. We are teaming up on this month’s column to discuss the longitudinal balance test. It is one of many discussions that we get into on providing quality bandwidth. I have been preaching for years that if you are going to provide bandwidth over the copper infrastructure then the copper infrastructure must be stellar, and the longitudinal balance test properly applied and interpreted — and this will indicate the health of any copper…

Don’t forget to blanket your horse!


I often share my list of “how to best approach both your tasks and your customers,” but I have to admit, I plagiarize much of that content from the following. So I figured, why not give you the original material? Here you go. Chicago, Illinois B. E. Sunny, President October 28, 1911 W. R. Abbott, Superintendent RULES FOR TROUBLEMEN 1. Put up a “good front.” It is not necessary to advertise any tailor shop, neither is it necessary to go about your work looking like a coal heaver. Overalls can look as respectable as anything else, but they must at…

Cable Pair Trouble in the Copper Infrastructure


And Its Effect on Bandwidth My goal when consulting or training is to help companies work with what they have to achieve the maximum quality bandwidth possible over paired copper. Getting to best quality sounds simple: you need a clean cable pair with good longitudinal balance within the reach for that particular type of bandwidth service from ADSL to G.fast. Yet there are many obstacles to overcome to achieving maximum bandwidth. The biggest challenges to achieving maximum bandwidth: • Longitudinal Balance • Bonding and Grounding • Noise • Crosstalk Some troubles affect only one circuit, and other faults affect all…

The Arduous Task of Cable Locating Path and Depth


Locating underground utilities is becoming more and more difficult for all utility companies due to increased congestion on main feeder runs and in subdivisions. In the old days of locating our concerns were dozers, backhoes, trenchers, and shovels. In today’s environment there is the dreaded horizontal boring machine. The boring machine can be controlled to an exact depth, but the problem lies with today’s cable locators in giving the exact depth of existing utilities. Cable locators do not find pipes and cables. They find electromagnetic fields that surround the pipes or cables. Why does it matter? Because electromagnetic fields do…

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