User:Itpastorn/cable

Definitions of STP/ScTP/FTP/UTP cable

Explanation

A

Protective sheath around all 4 pairs

P

The individual pairs have protective sheath

Book sources

Source	STP	ScTP	FTP
Cisco Press: CCNA 3.1 Companion Guide, 2nd ed	AP	A	A
Börge Nielsen, Datorkommunikation	"skärmad"		"med plasthölje"

Online sources

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}