cat6 FTP patch cable

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Category 5 cable (Cat 5) is a twisted pair cable for carrying signals. This type of cable is used in structured cabling for computer networks such as Ethernet. It is also used to carry other signals such as telephony and video. The cable is commonly connected using punch down blocks and modular connectors. Most Category 5 cables are unshielded, relying on the twisted pair design and differential signaling for noise rejection. Category 5 has been superseded by the Category 5e specification

Cable standard

The specification for Category 5 cable was defined in ANSI/TIA/EIA-568-A, with clarification in TSB-95.[citation needed] These documents specified performance characteristics and test requirements for frequencies of up to 100 MHz. Cable types, connector types and cabling topologies are defined by TIA/EIA-568-B. The cable is terminated in either the T568A scheme or the T568B scheme. Canada and Australia use the T568A standard, and the United States commonly uses T568B scheme.[citation needed] The two schemes work equally well and may be mixed in an installation so long as the same scheme is used on both ends of each cable. Nearly always, 8P8C modular connectors, often incorrectly referred to as "RJ-45", are used for connecting category 5 cable. The USOC/RJ-61 standard is used in multi-line telephone connections.

Characteristics

Electrical characteristics for Cat 5e UTP PropertyNominal ValueToleranceUnitref

Characteristic impedance @ 100 MHz	100	± 15	Ω	[10]
Nominal characteristic impedance @ 100 MHz	100	± 5	Ω	[10]
DC-Loop resistance	≤ 0.188		Ω/m	[10]
Propagation speed	0.64		c	[10]
Propagation delay	4.80-5.30		ns/m	[10]
Delay skew < 100 MHz	< 0.20		ns/m	[10]
Capacitance at 800 Hz	52		pF/m	[10]
Inductance	525		nH/m	[11]
Cutoff frequency	50323		Hz	[11]
Max tensile load, during installation	100		N	[10]
Wire size	AWG-24 (0.205 mm² )			[10][12]
Insulation thickness	0.245		mm	[10]
Maximum current per conductor	0.577		A	[12]
Temperature operating	-55 to +60		°C	[10]

[edit] DielectricExample materials used as dielectric in the cable[13] AcronymMaterial

PVC	Polyvinyl Chloride
PE	Polyethylene
FP	Foamed polyethylene
FEP	Teflon/fluorinated ethylene propylene
FFEP	Foamed Teflon/fluorinated ethylene propylene
AD/PE	Air dielectric/polyethylene

[edit] Individual twist lengths

By altering the length of each twist, crosstalk is reduced, without affecting the characteristic impedance.[11][dubious – discuss]

  Pair color[cm] per turnTurns per [m]

	Green	1.53	65.2
	Blue	1.54	64.8
	Orange	1.78	56.2
	Brown	1.94	51.7

cat6 FTP patch cable