User:Itpastorn/cable
Definitions of STP/ScTP/FTP/UTP cable
[edit]Explanation
[edit]- A
- Protective sheath around all 4 pairs
- P
- The individual pairs have protective sheath
Book sources
[edit]| Source | STP | ScTP | FTP |
|---|---|---|---|
| Cisco Press: CCNA 3.1 Companion Guide, 2nd ed | AP | A | A |
| Börge Nielsen, Datorkommunikation | "skärmad" | "med plasthölje" |
Online sources
[edit]| Source | STP | ScTP | FTP |
|---|---|---|---|
| My initial understanding | AP | A | A |
| http://learn-networking.com/network-design/a-brief-overview-of-networking-media | AP | ||
| http://www.adccomputerservices.com/pc_terms/index.html | A | ||
| http://www.elitelex.com/DataNetworkingComps.htm | AP | A | |
| http://www.siemon.com/us/standards/13-02_over.asp | AP | A | A |
http://www.siemon.com/us/standards/13-02_over.asp says FTP = ScTP according to TIA (now called F/UTP by the source). The same source says that it now calls S/FTP what it previously used to call "PiMF", "STP", or "SSTP".
Useless sources:
STP have only two lines TOTAL, according to
- http://www.interfacebus.com/Engineering_Dictionary_7.html and
- http://www.ex-designz.net/atm_glossary.asp
Total confusion at this source - according to which STP can be anything!:
- Unshielded Twisted Pair Cable (UTP)
- {most common} has four twisted pairs {typically 100 Ohm +/- 15% impedance}.
- Screened Twisted Pair (ScTP) also called (STP)
- has a single braided screen over all four pairs {typically 100 Ohm +/- 15% impedance}.
- Foil Twisted Pair (FTP) also called (STP)
- has a single foil wrap over all four pairs {typically 100 Ohm impedance}.
- Fully Shielded Twisted Pair (SSTP) also called (STP)
- each pair shielded and shield over all 4 pairs {typically 100 +/- 15% Ohms}.
- (Obsolete) IBM STP Cable (STP-A)
- each pair foil shielded and braid over both (2) pairs; also called (STP) {typically 150 Ohms}