Jim Hayes

Fiber Optics Columnist and Freelance Writer

HAYES is a VDV writer and trainer and the president of The Fiber Optic Association. Find him at www.JimHayes.com.

Articles by Jim Hayes

June 2010
For electricians, voltage is the primary thing measured. In fact every electrical measurement is based on voltage, based on the relationship V = IR. In fiber optics, the most basic measurement is the optical power of the light at the end of a fiber. Optical power measurement is the basis for loss measurements as well as the power in an operating system at the source or receiver. READ MORE
May 2010
There must be a gazillion ways to install premises cabling, depending on the design of the building and location of users. Let’s look at some of the guidelines included in TIA 568 or ISO/IEC 11801 standards. Answers and explanations are in red. 1. Within a building, cables may be run in __________. A. Cable trays B. Conduit or duct C. RacewaysD. READ MORE
May 2010
Many of the problems encountered in troubleshooting fiber optic networks are related to making proper connections. Since the light used in fiber optic systems is infrared (IR) light, which is beyond the range of the human eye, one cannot see it. READ MORE
April 2010
Let’s look at some commonly accepted rules, standards and codes and the reasons behind them. Each rule is followed by some reasons. It’s your job to pick the real reason why the rule exists. Correct answers and explanations are in red. 1. Structured cabling standards are based on a maximum cable length of 100 meters. A. It was an early attempt at metrification in the U.S. READ MORE
April 2010
The cost of installation for most fiber optic cable exceeds the cost of the cable itself, so ensuring the cable is good before installation is important. The first test the installer must do with a spool of cable is visually inspect it. The spool of cable should show no visible damage, indicating it has been properly handled during shipment. READ MORE
April 2010
Most contractors assume it is necessary to field-terminate fiber optic cabling systems as part of every installation, but they are all looking for alternatives. The first alternative most people consider is to use prepolished/splice connectors, which use a mechanical splice to terminate the fiber. READ MORE
March 2010
Proper tools and test equipment are essential for the fiber optic installer. In my recent series on fiber optic installation, I discussed which tools and test equipment you need, so let’s see what you learned. Correct answers and explanations are in red. READ MORE
March 2010
Having covered how to design and install fiber optic networks in recent columns, we are ready to start a new series, “Testing the Fiber Optic Cable Plant.” READ MORE
February 2010
Premises cabling to support phones and PC networks hasn’t really changed much since it was first standardized by TIA-568 around 1990; It has just become faster, and Ethernet local-area networks (LANs) are now a thousand times faster. Plain old telephone service (POTS) has migrated to voice over Internet protocol (VoIP) on Ethernet LANs. READ MORE