High-performance cable for today’s networks runs laps around cheap imitations. Make sure you know what you’re installing, and you can avoid performance and reliability problems down the line.

How to Avoid Installing Bad Ethernet Cable

Contributed by | Platinum Tools


When a cable install goes wrong, it’s a costly mess. If you haven’t experienced one, you’ve heard about one. It often catches everyone by surprise. On acceptance, or when the customer starts using the network in production, something just isn’t right. It could be the cable, someone says. But Cat6 cable is a commodity item, right? Even the cheap overseas type? Still, your reputation is on the line, and the next suspect might be the installation. Let’s talk about the cable, also the risk of “copper clad” conductors.


Standards are Rising

At today’s network speeds, things which go seriously wrong with the wiring can seem very subtle on visual inspection. Even within Cat6, there are 250MHz and 550MHz rated cable versions. Termination has to be 100%, not just making contact. Conductor twist must be consistent. Cable physical and electrical characteristics have to be 100% also, especially as the network evolves and physically ages over time. But even major differences like copper versus copper-clad conductors can be hard to detect at first.

You’re dealing with radio frequencies (RF) going down the cable, and that energy can be mighty finicky. If you’ve ever put a tiny bit of metal in a microwave oven by accident, you’ve seen what a change in characteristics can do. Suddenly, the chamber is arcing and sparking as the RF waves start getting chaotic. Networking has a bit lower frequencies (so far), and much lower energy, but the concept is the same. RF complains mightily when it’s not happy with how you’re treating it.


What Makes Cable Bad

Some of the critical items in cable manufacturing are:

  • Shielding
  • Conductor twist
  • Insulation
  • Wire gauge
  • Wire composition

Installation stresses and damage are also important, as well as cable termination. Along the length of the cable, you need consistent and quality manufacturing for reliable cable capacitance, or else — think of the metal in the microwave. Things start to get chaotic.


Background Check the Cable

The best way to avoid problems is to cover all the bases. Check the advertised specs and labeling, but be skeptical. Cheap cable is often deceptively labeled. Has the manufacturer submitted cable for certified testing? This will cover you not only for electrical characteristics, but also heat, humidity, even mold damage over time, depending on the testing standard. Remember to look for “plenum rated” cable when you need it. Some of your customers may not need all that, but some will. Think about hospital installs, for example. You’re going to sign a pretty extensive contract for those, even if all it says is “conforms to applicable standards.”


Copper Conductors Only

For most applications, solid all-copper conductor wire of the appropriate gauge is what you’ll be ordering, and what you should be receiving. CCA or CCS, copper clad aluminum or steel, looks the same but doesn’t perform the same — all copper conducts better, for instance. Aluminum can get brittle and break, and has greater loss than copper. PoE current is another problem with non-copper conductors. There are many ways to check for “copper clad”:

  • For steel, does a magnet stick to it?
  • Does it bend differently than known all-copper cables? (rigid or flimsy)
  • Is the wire damaging your crimper blade? (steel)
  • Does the conductor droop in a lighter flame? (aluminum)
  • Is the resistance of long runs higher than known copper conductors? (big PoE problem, and lossy)
  • Does the cable or box mention CCA or CCS, or not mention solid copper?

High-performance cable for today’s networks runs laps around cheap imitations. Make sure you know what you’re installing, and you can avoid performance and reliability problems down the line.



Platinum Tools

Platinum Tools

Platinum Tools - professional tools to cut, strip, terminate and test.

Other Articles

Ethernet Speed Certification
Inspired by the IP industry where engineers have a huge resource of off-shelve tools and materials that they can call on to inspire new designs and easily create software to make things work, the Ethernet testing industry is quickly adopting an approach where testers are specifically designed to certify Ethernet.
VDV Digital Testers
VDV MapMaster 2.0 can impressively map up to 19 locations, it still does utilize the tried and true tone generation. This gives techs the capability to adapt to the mapping features of the product while providing a great fall back when toning speaker wire and other miscellaneous cables. Now with the added TDR technology, it has the ability to both measure the entire length of a cable and or individual pairs, as well as measure the distance to a short in the cable.
More about Platinum Tools

Comments (0)

This post does not have any comments. Be the first to leave a comment below.

Post A Comment

You must be logged in before you can post a comment. Login now.

Featured Product

GreenPeak’s GP565 – ZigBee for smart Remote Controls

GreenPeak's GP565 - ZigBee for smart Remote Controls

The GP565 Smart Home RF chip for remote controls supports voice control, motion sensing and the new ZRC 2.0 protocol. The GP565 is optimized for advanced & low cost ZigBee RF4CE remote controls. • 120k or 248k Flash (8k or 16k RAM) memory • 40-pin footprint to support a keyboard scanner interface or other IO interfaces required for remote controls. • Reduced current consumption and improved receiver sensitivity and output power • Patented Antenna Diversity technology enables superior range and WiFi/Bluetooth interference rejection