Browsing: OSP Expert

Line powering is a way to power remote equipment from a central location using existing cable pairs in the copper network. It is an alternative to commercial power which can be expensive and sometimes it is unavailable. This is not something new. Line power has been used as far back as the early 1960s by Telcos for T1 power and then HDSL powering and more recent DSLAM powering. Today there are a plethora of applications such as fiber-to-the-node (FTTN), distributed antenna systems (DAS), and remote unit powering among other applications including FTTH for many independent Telephone companies. Following is one…

I received an email from Glen Copeland, who is a Registered Communications Distribution Designer (RCDD) and the Principal Engineer for a large Utility in Central Washington State. The Utility has built a fiber optic network that extends to most of their county, providing residents with broadband access speeds up to 1 Gbps. As a utility provider, their main business is to provide power to their customers. Their electric rates are among the lowest in the nation, while their customer service standards are among the highest. With a focus on the customer, their goal is simple: safely provide utility services that enhance…

The PSTN, or POTS, network may be at the end of its life, but the copper infrastructure properly maintained continues to generate revenue from special access circuits to homes and businesses for years to come. In 2015, the FCC released new data claiming that there was over $40 billion in broadband and data service revenues known as special access. The majority of special access service is still mostly copper-based services, and that revenue-generating copper infrastructure is paid for. To date, only 25% of the homes and businesses in the US are fiber-served. Fiber is deployed as fast as it is…

Many Telcos are now comparing the cost of placing fiber-to-the-home (FTTH) vs. G.fast in brownfield construction. FTTH is common in greenfield construction. Placing fiber in subdivisions that are already served with paired copper networks, both aerial and buried, is an arduous task and it is extremely expensive. G.fast is, for most, a viable, less expensive alternative. G.fast is a digital subscriber line (DSL) protocol standard for local copper loops shorter than 1,600 feet (500 meters) offering speeds over 100 megabits. G.fast uses fiber to existing buried pedestals or aerial terminals, and then uses existing copper to the residence, and uses existing…

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 a POTS line to a cable…

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…

1 2 3 4