OSP Expert: Don McCarty

Troubleshooting the Copper Network

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When Test Sets Do Not Perform to Expectations — Field technicians have a multitude of test equipment that is used to identify and locate faults in the copper network. Many of the test sets have multi-function features. If the fault or faults in the cable are resistive in nature, such as unwanted shorted and grounded cable pairs or crossed battery from other cable pairs in the same compliment, the test set has a resistive fault locate function (RFL) and a Time Domain Reflectometer (TDR) function to help you locate these problems. If the fault or faults in the cable are…

Repair of Your Wounded Copper Infrastructure

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In an earlier column we discussed the proactive process of finding single pair faults in the copper infrastructure rather than moving the customer to another cable pair to restore service. This proactive approach of finding and fixing single pair faults will resolve problems in 95% or more of your copper infrastructure customers, and quickly gets them back in service. Additionally, adhering to this process can support identifying other potential pedestal and terminal problems that can be repaired before customer service is affected. The other 5% of service interruptions occur in bad sections of cable, both aerial and buried, in the copper…

High Voltage Transmission Lines Over a CO/Hut

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I recently received an email from Aaron, a manager of an independent telephone company, discussing the effect of high voltage lines on telephone equipment. He stated that a power transmission company is proposing to build a transmission line adjacent to one of his existing telephone buildings. From the proposal drawings it appears the lines will be within 100’ of the building, and could possibly go directly over the building. It is an unmanned building, but they have copper and fiber equipment and distribution at this location. He asked me if I foresee problems from electromagnetic interference and, if so, is…

Moisture Diffusion in Underground Pulp Cable Networks

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During a phone call, a cable maintenance supervisor from a large metropolitan area described a cable maintenance problem he had been recently encountering when qualifying pulp cable pairs for power pairs. When testing any cable pairs for potential power pairs, the pair must test less than 10VAC tip to ring, tip to ground, and less than 3VDC tip to ring, tip to ground, and ring to ground. The insulation resistance must test greater than 100 megohms tip to ring when applying 500VDC to the pair with an electrical insulation test set, and greater than tip and ring to ground when…

More on the Resistance Bridge

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In last month’s column, Tim, a skilled field tech, stated: Maybe I missed it, but I’ve never seen a good column on the resistance bridge feature. It is the best time-saver there is when used properly, especially when using it in the field by yourself. It can help you get a good idea where the trouble is as opposed to having to be dead wrong when digging up a street or someone’s front yard. Any tricks and tips would be appreciated. Thank you, Tim Segada In the June column I explained the basics of electronic reference, and Tim stated that…

Fault Locating the Copper Infrastructure With a Multi-Function Test Set

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I recently received an email from a quality cable maintenance technician. He stated the following: Maybe I missed it, but I’ve never seen a good column on the resistance bridge feature. It is the best time saver there is when used properly, especially when using it in the field by yourself. It can help you get a good idea where the trouble is as opposed to having to be dead wrong when digging up a street or someone’s front yard. Any tricks and tips would be appreciated. Thank you, Tim Segada The resistance fault locating feature (RFL) in the multi-function…

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