OSP Expert: Don McCarty

Longitudinal Balance of a Copper Cable Pair and Its Effect on Bandwidth

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To describe how longitudinal balance of a cable pair affects the circuit let’s look back in time. The first telephone circuits were telegraph lines or open wire (one-wire) circuits with ground as a return. In the late 1800s, electric streetcars were used in many cities. Because there was zero longitudinal balance on a one-wire circuit, unwanted frequencies and power influence (noise to ground) rendered the circuit useless. To solve the problem, the telephone companies converted to balanced circuits (tip and ring), which also reduced attenuation increasing the distance for telephone circuit. But, 2 wires strung side-by-side sharing the ground with…

A Quality Test Set for Construction Splicers

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I’ve been on a kick writing about replacement multifunctional test sets for the Dynatel 965. In the process, I spoke with a provider of a set manufactured for construction conformance testing. Multifunctional test sets like the Dynatel 965, EXFO, JDSU, Megger, Copper Pro, and others, are used for conformance testing, but separate talk circuits and external tone sources have to be set up separately. One good answer to the problem is the AALogic D-105. The AALogic D-105 Construction Test Set was designed primarily for conformance testing by construction splicing technicians. It adds testing features necessary in today’s market to assure…

Field Test Sets for Provisioning and Maintaining the Copper Infrastructure

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Round 4 This column is the 4th in a series about test sets. I began by writing about the 965 — an industry favorite that will no longer be produced. Then I moved to a few of the test sets that are excellent replacements including: the Megger HT1000/2, the JDSU HST3000, and today I write about the EXFO MaxTester 635. If you asked which of these 3 is best, I could only answer that each of them is an excellent option and which is best depends on your specific needs: The capabilities of the techs using it, the most common…

Field Test Sets for Provisioning and Maintaining the Copper Infrastructure

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Round 3 I began this Dynatel 965 “replacement campaign” 2 months back with a discussion of the Dynatel 965, a much beloved test set. In fact, this advanced test set outshined others in its class by leaps and bounds so that we continued to believe it could not be beaten. Great marketing Dynatel! However, I believe that all the test sets I’m reviewing as replacement sets are, in fact, well advanced beyond the 965. After all, technology has advanced while prices are, in many cases, a better value. In my February column, I looked at the Megger HT1000/2. A great…

Field Test Sets for Provisioning and Maintaining the Copper Infrastructure

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Round 2 To recap from last month’s column, field technicians use many different test sets from multiple vendors to provision and maintain the copper infrastructure. Last month, I reviewed the test set that seemed to me to offer a good combination of features, dependability, accuracy, price and ease of use: the Dynatel 965AMS. I also wrote that beginning with the next column, I would begin looking at “replacement” sets given the 965 is no longer produced. In writing about alternative test sets to the 965, I’m hoping that we can begin a dialog about what features you most want to…

Field Test Sets for Provisioning and Maintaining the Copper Infrastructure

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To provision and maintain the copper infrastructure, field technicians use many different test sets from multiple vendors. Field technicians and managers constantly ask me which is my favorite multi-functional test set and I consistently maintain my objectivity and neutral stance. There are always upsides and downsides to each test set — it’s how the vendors differentiate and market their products. I wish I could take the best features from every vendor’s set and put them in one test set with a simple step-by-step flow chart for using any feature, that would be my favorite, but that doesn’t happen — and…

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