Shielded twisted pair og Foiled twisted pair

[KillYou]

Har noen spørsmål angående nettverkskabler, -utak

 

Shielded twisted pair og Foiled twisted pair.

 

Hvilken av disse skjermer best mot stråling og hva er fysisk forskjellen mellom disse?

 

Og hvordan vil det virke vist disse kombineres, feks en ftp kabel og et stp utak?

Endret 4. juni 2008 av KillYou

[Thorsen]

Fra wiki:

 

Twisted pair cables are often shielded in attempt to prevent electromagnetic interference. Because the shielding is made of metal, it may also serve as a ground. However, usually a shielded or a screened twisted pair cable has a special grounding wire added called a drain wire. This shielding can be applied to individual pairs, or to the collection of pairs. When shielding is applied to the collection of pairs, this is referred to as screening. The shielding must be grounded for the shielding to work.

 

 

Shielded twisted pair (STP-A)

STP cabling includes metal shielding over each individual pair of copper wires. This type of shielding protects cable from external EMI (electromagnetic interferences). e.g. the 150 ohm shielded twisted pair cables defined by the IBM Cabling System specifications and used with token ring networks.

 

Screened shielded twisted pair (S/STP)

 

S/STP cabling, also known as Screened Fully shielded Twisted Pair (S/FTP), [1] is both individually shielded (like STP cabling) and also has an outer metal shielding covering the entire group of shielded copper pairs (like S/UTP). This type of cabling offers the best protection from interference from external sources, and also eliminates alien crosstalk[1].

 

Screened unshielded twisted pair (S/UTP)

 

S/UTP, also known as Fully shielded[citation needed] (or Foiled) Twisted Pair (FTP), is a screened UTP cable (ScTP).

 

Note that different vendors and authors use different terminology, i.e. STP has been used to denote both STP-A, S/STP and S/UTP[2].

 

http://en.wikipedia.org/wiki/Shielded_twis...air_.28STP-A.29

Endret 4. juni 2008 av Thorsen