How to avoid a PoE disaster


Power over Ethernet (PoE) is a great way to power remote equipment. Typical examples of PoE include powering VoIP phones and IP video cameras. However, it may come as a shock to realize that the first PoE standard (IEEE 802.3af) was only released in 2003, and prior to that equipment manufacturers used various ad hoc methods to remotely power their equipment. This equipment is still in use today, and technicians working on existing systems need to be aware of their potential to damage network equipment.

  • PoE History
  • Legacy Systems
  • DIY Power Injection
  • Faulty PoE Device
  • Avoid a Disaster by Using a Digital Network Cable Tester


To avoid surprises when working on existing networks, it is always best to check for wrong connections and the presence of unexpected voltages. The easiest way to do this is with a digital network cable tester, such as the network cable testers manufactured by T3 Innovation. Using the Cable Prowler™, you can detect and measure PoE as well as identify cable faults such as split wiring, open circuits and shorts. Another useful feature is the ability to accurately measure the distance to a fault, making it easy to locate and fix a faulty cable. The built-in tone generator helps you locate the right cable or even the location of an individual wire in the cable. The Net Prowler™ and Net Chaser™ digital cable testers incorporate similar capabilities, plus a host of features to help with network mapping, protocol discovery and measuring link speed. Avoid a PoE disaster: check your circuits with a digital tester.


The original article is posted by Jason Chesla on on May 5, 2016 2:10:22 PM

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