Contact us for an immediate quote at sales@itm-components.co.uk

Cable Shielding 101 - An Acronym Guide

by Stuart Berry July 05, 2017

Cable Shielding Blog

Cable shielding, (or screening), can be composed of a metallic braid, or metallic or polyester foil. The shielding can be either wrapped around all 4 pairs of twisted pair cable, just the individual conductor pairs, or both the entire cable and individual pairs. In a shielded product code, the letters preceding the slash are equivalent to the shielding on the whole cable; the code after the slash is equivalent to the shielding for the individual pairs. For example:

f-utp-diagram-blog

As a guide, if you have motors or generators placed next to network cables, EMI and RFI can reek havoc with data transmission on a copper cable. This will result in data errors, and quite possibly downtime. In order to wipe out EMI/RFI interference, you will need to go for shielded cables and connectors.

As you can see from the list below, there are fundamentally two types of cable shields: braided and foil. Which option you plump for will depend on your application.

Here is a glossary of terms to help you decode cable shielding:

Cable Shielding Glossary

  • FTP – Foiled Twisted Pair : An additional layer of protection is created with shielding/screening wrapped around the individual twisted wires.
  • STP – Shielded Twisted Pair : Braided shielding wrapped around the individual twisted wires adds a layer of protection.
  • F/UTP – Foiled/Unshielded Twisted Pair : An overall foil shield encases the 4 pairs of unshielded twisted pair. Commonly used in 10GBaseT applications.
  • S/UTP – Shielded/Unshielded Twisted Pair : An overall braid shield is wrapped around all 4 pairs of unshielded twisted pair.
  • SFTP – Shielded and Foiled Twisted Pair : Foil shielding around the individual twisted wires and an overall shield that is sometimes a flexible braided shield. This provides the highest level of protection from interference.
  • SF/UTP – Shielded and Foiled/Unshielded Twisted Pair : Both an overall braid screen and foil shield with unshielded twisted pairs. Occasionally referred to as an STP cable, these cables are very effective at protecting EMI/RFI from entering or exiting the cable.
  • S/FTP – Shielded Foiled/Twisted Pair : An overall braid shield with foil-shielded twisted pairs. The shield underneath the jacket is a braid and each individual pair is surrounded by its own foil shield. The purpose of the additional foil on individual pairs is to limit the amount of crosstalk between them.
  • F/FTP – Foiled/Foiled Twisted Pair : An overall foil shield with foil screened twisted pairs. Like F/UTP, this cable is commonly used in 10GBaseT applications.
  • U/FTP – Unshielded/Foiled Twisted Pair : No overall shielding or braid with foil-shielded twisted pairs. This cable is also frequently used in 10GBaseT applications.
  • U/UTP (UTP) – Unshielded/Unshielded Twisted Pair : Pairs of wires twisted together that are not shielded at all. These cables are often referred to as UTP andare one of the most basic methods used to help prevent electromagnetic interference.



Stuart Berry
Stuart Berry

Author



Also in News

New CAT6 Foiled Twisted Pair (FTP) cable from VPI

by Stuart Berry September 14, 2020

CAT6-LASV2-2-GRAY-SHLD and CAT6-LASV2-9-GRAY-SHLD

These left angle Category 6 patch cords are assembled with T568B four pair stranded cable, and are ideal for confined spaces. They consist of a foil shield with drain wire to protect signals from external noise, and a strain relief boot to reduce stress on the cable.

CAT6 is completely backward-compatible with current CAT5e equipment.

Continue Reading

The Extron USB-C to HDMI Interface

by Stuart Berry August 17, 2020

USB-C to HDMI Interface Extron

Introducing the Extron USB-C HD 101 USB-C to HDMI interface. This new interface provides USB-C video connectivity to HDMI device inputs, while supporting the power and charging needs for USB-C source devices. The USB-C HD 101 converts USB-C video to HDMI.

Continue Reading

NetPA® Ultra amplifiers - Now with Dante

by Stuart Berry July 31, 2020

Dante

With Extron's NetPA® Ultra amplifiers, you benefit from our award winning XPA Ultra amplifiers in combination with immensely powerful Dante network audio distribution. Dante connectivity makes it supremely easy to distribute audio from a centralized location to decentralized remote amplifiers throughout a building or campus using standard network hardware.

Continue Reading