Author Joe Randolph

Joe Randolph

Independent Consultant

Joseph Randolph is an independent consultant with over thirty years of experience in the design of telecommunications equipment. He received his BSEE degree from Virginia Polytechnic Institute and his MSEE degree from Purdue University. Prior to becoming a consultant in 1984, he was employed at AT&T Bell Labs. His background includes the design of traditional telecom voice and data equipment, DSL, and a wide variety of emerging VOIP and IP telephony products including optical network terminal devices. His primary specialty areas are circuit design, lightning protection, international regulatory compliance, and compliance with industry standards such as Telcordia NEBS GR-1089 for carrier-class telecom equipment in the USA. He is a Senior Member of the IEEE and serves on the Telecom Advisory Committee of the IEEE Product Safety Engineering Society.

New Requirements for MOVs Used for Surge Suppression on AC Mains Ports

It is a common misconception that any product that complies with IEC 60950-1 will also comply with IEC 62368-1. A key goal of this article is to help readers of IEC 62368-1 understand the underlying safety concerns that the new requirements are trying to address.

Designing Ethernet Cable Ports to Withstand Lightning Surges

Known mechanisms that couple lightning surges onto communication cables, and how these mechanisms apply for the specific case of Ethernet cabling.

Wirelessly Powering IoT With 5G Network

Polymer Film Can Limit Electromagnetic Interference

Using Nanomaterials to Create a Passive Dual-Mode Heating and Cooling Device

Scientists Develop Highly Efficient Supercapacitor That Could Rival Batteries

Material Found to Block Electromagnetic Waves

Saelig Introduces New Economical 50MHz 4-Channel Oscilloscope

FCC Warns of Emergency Broadband Program Imposter Website

FCC Proposes Largest Robocall Fine Under TCPA

FDA Offers Online Tracker for Premarket Submissions

Failure Analysis: A Road Map

System-Level Grounding

SCIF and Radio Frequency Secured Facility Design

EMC Design Techniques for Electric Vehicle Powertrain Modules

System-Level Simulation Solutions for EOS and ESD

EMC and Safety for Installations: Part 2

EMC and Safety for Installations: Part 1

The History of EMI Gasket Test Methods

Caster Contact: The Achilles Heel of ESD Floors

Will 4% Steps Find Radiated Susceptibilities?

How Grounds Affect the Peak Voltage Due to Lightning

Firmware: The Inexpensive Way to Address EMC Issues

Device Failure from the Initial Current Step of a CDM Discharge

Why You Should Pay Attention to Cable Discharge Events (CDE)

IEC Releases TR 62544:2011+AMD1:2016 CSV, Standard for HVDC systems

Toward Standardization of Low Impedance Contact CDM

The American National Standards Committee on EMC – C63®

Protection of High Voltage Power Substation Control Electronics from HEMP and IEMI

Market-driven Standardization and IEEE 802.3™ Ethernet Innovation

RF Tech Tip: BNC Versus Threaded Connectors

Troubleshooting EMC Problems Like an MD

Avoiding Supply Chain Disruptions of Safety-Critical Recognized Components

Controlling Static Electricity: A 50-Year History

Continuing Your Professional Education in 2021

There’s an “R” in “Varistor”

Joe Randolph

New Requirements for MOVs Used for Surge Suppression on AC Mains Ports

Designing Ethernet Cable Ports to Withstand Lightning Surges