Your computer uses these to talk to other computers - network Cat5e and Cat6 cables
Wiring
Feb 20, 2016 Ethernet represents the plumbing pipes of the Internet. Many network installers and system integrators are familiar with Cat5e and Cat6 cables with RJ45 connectors. But the term “Ethernet”, co-invented by Robert Metcalfe, encompasses an entire range of.
Both Cat5e and Cat6 are twisted pair cables that use copper wires, typically 4 twisted pairs in each cable. The specification for Cat6 features more stringent specifications for crosstalk and system noise, and provides performance of up to 250 MHz. Cat5e, in contrast, performs up to 100 MHz. This was often achieved using a spline (a longitudinal separator) in the wiring, which isolates each of the four pairs of twisted wire. However, this made Cat6 cables more rigid; newer cables use other methods to reduce noise and are more flexible. Regardless of whether a spline is used, a cable that meets Cat6 specifications provides significantly lower interference or near end crosstalk (NEXT) in the transmission. It also improves equal level far end crosstalk (ELFEXT), return loss and insertion loss compared with Cat5e. The result is less noise, fewer errors and higher data rates in the transmission of the signal.
How to identify
The category is almost always printed on ethernet cables. It is not possible to identify cable categories by color, but Cat6 cables are often thicker than Cat5e because it uses thicker copper wires. It is also not possible to identify them by looking at the plug because both Cat5e and Cat6 use the 8P8C RJ45 modular connector.
Maximum Length
Both Cat5e and Cat6 cable specifications allow lengths up to 100 meters, but Cat6e has a lower max length (55 meters) when used for 10GBASE-T (10 Gigabit Ethernet). In order to run 10GBASE-T for 100 meters, Category 6a cable, or Augmented Category 6, cables need to be used. Cat6a cables allow performance up to 500 MHz.
If network infrastructure requires covering distances larger than 100 meters, repeaters or switches are required to amplify the signal.
Speed
As mentioned previously, Cat6 cables can be used to power 10GBASE-T, or 10 Gigabit Ethernet, while the maximum that Cat5e cables can support is 1GBASE-T, or 1 Gigabit Ethernet. This is because Cat6 cables perform up to 250 MHz, more than twice that of Cat5e cables (100 MHz).
Cost
The price of ethernet cables vary by length, manufacturer and seller. In general, Cat6 cables are 10-20% more expensive compared with Cat5e cables. However, cables are generally cheap and the speed boost offered by Cat6 cables usually makes the price premium well worth it, even for home use.
What and where to buy
Most of the top 20 best selling ethernet cables on Amazon are Cat6. Cat5e cables are not popular any more and Cat6a do not seem to have caught on yet.
Is it Worth it?
There is an argument to be made that it is not worth it to invest in higher performance cables like Cat6 or Cat6a considering that the hardware on the network—modems and routers—may not be Cat6a-ready yet, i.e., if the throughput of this network equipment is the bottleneck that prevents the network from operating at the full speed afforded by Cat6.
But hardware gets upgraded over time; it is much easier to upgrade modems and routers than it is to lay in new cabling. The price difference between Cat6 and Cat5e is not that high and it is usually a good idea to spring for the better quality cable.
References
Partially stripped cable showing the four twisted pairs (eight wires).
Category 5 cable, commonly referred to as Cat 5, is a twisted pair cable for computer networks. Since 2001, the variant commonly in use is the Category 5e specification (Cat 5e). The cable standard provides performance of up to 100 MHz and is suitable for most varieties of Ethernet over twisted pair up to 1000BASE-T (Gigabit Ethernet). Cat 5 is also used to carry other signals such as telephony and video.
This cable is commonly connected using punch-down blocks and modular connectors. Most Category 5 cables are unshielded, relying on the balanced line twisted pair design and differential signaling for noise rejection.
- 5Characteristics
Cable standard[edit]
The specification for category 5 cable was defined in ANSI/TIA/EIA-568-A, with clarification in TSB-95.[1] These documents specify performance characteristics and test requirements for frequencies up to 100 MHz.
The cable is available in both stranded and solid conductor forms. The stranded form is more flexible and withstands more bending without breaking. Patch cables are stranded. Permanent wiring used in structured cabling is solid-core. The category and type of cable can be identified by the printing on the jacket.[2]
Termination[edit]
Pin | Pair | Wire | Color |
---|---|---|---|
1 | 3 | 1 | white/green |
2 | 3 | 2 | green |
3 | 2 | 1 | white/orange |
4 | 1 | 2 | blue |
5 | 1 | 1 | white/blue |
6 | 2 | 2 | orange |
7 | 4 | 1 | white/brown |
8 | 4 | 2 | brown |
Stp(shielded twisted pair)TAKADA BODO SIAL LA
Pin | Pair | Wire | Color |
---|---|---|---|
1 | 2 | 1 | white/orange |
2 | 2 | 2 | orange |
3 | 3 | 1 | white/green |
4 | 1 | 2 | blue |
5 | 1 | 1 | white/blue |
6 | 3 | 2 | green |
7 | 4 | 1 | white/brown |
8 | 4 | 2 | brown |
A Cat 5e Wall outlet showing the two wiring schemes: A for T568A, B for T568B.
Category 5 patch cable in T568B wiring
Cable types, connector types and cabling topologies are defined by TIA/EIA-568-B. Nearly always, 8P8C modular connectors (often referred to incorrectly as RJ45 connectors[4][5][6]) are used for connecting category 5 cable. The cable is terminated in either the T568A scheme or the T568B scheme. 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.
Variants[edit]
The category 5e specification improves upon the category 5 specification by revising and introducing new specifications to further mitigate the amount of crosstalk.[7] The bandwidth (100 MHz) and physical construction are the same between the two,[8] and most Cat 5 cables actually meet Cat 5e specifications, though they are not specifically certified as such.[9] The category 5 was deprecated in 2001 and superseded by the category 5e specification.[10]
Applications[edit]
Category 5 cable is used in structured cabling for computer networks such as Ethernet over twisted pair. The cable standard provides performance of up to 100 MHz and is suitable for 10BASE-T, 100BASE-TX (Fast Ethernet), and 1000BASE-T (Gigabit Ethernet). 10BASE-T and 100BASE-TX Ethernet connections require two wire pairs. 1000BASE-T Ethernet connections require four wire pairs. Through the use of power over Ethernet (PoE), power can be carried over the cable in addition to Ethernet data.
Cat 5 is also used to carry other signals such as telephony and video.[11]In some cases, multiple signals can be carried on a single cable; Cat 5 can carry two conventional telephone lines as well as 100BASE-TX in a single cable.[12][13][14][15][16] The USOC/RJ-61 wiring standard may be used in multi-line telephone connections. Various schemes exist for transporting both analog and digital video over the cable. HDBaseT(10.2 Gbit/s) is one such scheme.[17]
Characteristics[edit]
The use of balanced lines helps preserve a high signal-to-noise ratio despite interference from both external sources and crosstalk from other pairs.
Property | Nominal | Tolerance | Unit | ref |
---|---|---|---|---|
Characteristic impedance, 1–100 MHz | 100 | ± 15 | Ω | [18] |
Characteristic impedance@ 100 MHz | 100 | ± 5 | Ω | [18] |
DC loop resistance | ≤ 0.188 | Ω/m | [18] | |
Propagation speed | 0.64 | c | [18] | |
Propagation delay | 4.80–5.30 | ns/m | [18] | |
Delay skew< 100 MHz | < 0.20 | ns/m | [18] | |
Capacitance at 800 Hz | 52 | pF/m | [18] | |
Inductance | 525 | nH/m | [19] | |
Corner frequency[a] | ≤ 57 | kHz | [19] | |
Max tensile load, during installation | 100 | N | [18] | |
Wire diameter | 24 AWG(0.51054 mm; 0.205 mm2) | [18][21] | ||
Insulation thickness | 0.245 | mm | [18] | |
Maximum current per conductor | 0.577 | A | [21] | |
Operating temperature | −55 to +60 | °C | [18] | |
Maximum operating voltage (PoE uses max 57 V DC)[22] | 125 | [23] |
Insulation[edit]
![Keystone Keystone](/uploads/1/2/4/9/124990971/130000632.jpg)
Outer insulation is typically polyvinyl chloride (PVC) or low smoke zero halogen (LSOH).[citation needed]
Acronym | Material |
---|---|
PE | Polyethylene |
FP | Foamed polyethylene |
FEP | Fluorinated ethylene propylene |
FFEP | Foamed fluorinated ethylene propylene |
AD/PE | Air dielectric/polyethylene |
LSZH or LS0H | Low smoke, zero halogen |
LSFZH or LSF0H | Low smoke and fume, zero halogen |
Bending radius[edit]
Most Category 5 cables can be bent at any radius exceeding approximately four times the outside diameter of the cable.[25][26]
Maximum cable segment length[edit]
The maximum length for a cable segment is 100 m per TIA/EIA 568-5-A.[27] If longer runs are required, the use of active hardware such as a repeater or switch is necessary.[28][29] The specifications for 10BASE-T networking specify a 100-meter length between active devices.[30] This allows for 90 meters of solid-core permanent wiring, two connectors and two stranded patch cables of 5 meters, one at each end.[31]
Conductors[edit]
Since 1995, solid-conductor UTP cables for backbone cabling is required to be no thicker than 22 American Wire Gauge (AWG) and no thinner than 24 AWG, or 26 AWG for shorter-distance cabling. This standard has been retained with the 2009 revision of ANSI TIA/EIA 568.[32]
Although cable assemblies containing 4 pairs are common, category 5 is not limited to 4 pairs. Backbone applications involve using up to 100 pairs.[33]
Individual twist lengths[edit]
The distance per twist is commonly referred to as pitch. Each of the four pairs in a Cat 5 cable has differing precise pitch to minimize crosstalk between the pairs. The pitch of the twisted pairs is not specified in the standard. Measurements on one sample of Cat 5 cable yielded the following results.[34]
Pair color | [cm] per turn | Turns per [m] |
---|---|---|
Blue | 1.38 | 72 |
Green | 1.53 | 65 |
Orange | 1.78 | 56 |
Brown | 1.94 | 52 |
Since the pitch of the various colors is not specified in the standard, pitch can vary according to manufacturer and should be measured for the batch being used if cable is being used in non-Ethernet situation where pitch might be critical.
Environmental ratings[edit]
Class | Phrase | Description | Standards |
---|---|---|---|
LSZH | Communications low-smoke zero halogen | NES‑711, NES‑713, MIL‑C‑24643, UL 1685 | |
CMP | Communications plenum | Insulated with fluorinated ethylene propylene (FEP) and polyethylene (PE) and jacketed with low-smoke polyvinyl chloride (PVC), due to better flame test ratings. | CSA FT6[36] or NFPA 262 (UL 910) |
CMR | Communications riser | Insulated with high-density polyolefin and jacketed with low-smoke polyvinyl chloride (PVC). | UL 1666 |
CMG | Communications general purpose | CSA FT4 | |
CM | Communications | Insulated with high-density polyolefin, but not jacketed with PVC and therefore is the lowest of the three in flame resistance. | UL 1685 (UL 1581, Sec. 1160) Vertical-Tray |
CMX | Communications residential | UL 1581, Sec. 1080 (VW-1) | |
CMH | CSA FT1 |
Some cables are 'UV-rated' or 'UV-stable' meaning they can be exposed to outdoor UV radiation without significant degradation.[citation needed]
Plenum-rated cables are slower to burn and produce less smoke than cables using a mantle of materials like PVC. Plenum-rated cables may be installed in plenum spaces where PVC is not allowed.[37]
Shielded cables (FTP or STP) are useful for environments where proximity to RF equipment may introduce electromagnetic interference, and can also be used where eavesdropping likelihood should be minimized.
Comparison with later standards[edit]
The Category 6 specification improves upon the Category 5e specification by extending frequency response and further reducing crosstalk. The improved performance of Cat 6 provides 250 MHz bandwidth and supports 10GBASE-T (10-Gigabit Ethernet) for distances up to 55 meters.[10] Category 6A cable provides 500 MHz bandwidth and supports 10GBASE-T for distances up to 100 meters. Both variants are backwards compatible with Category 5 and 5e cables.
Notes[edit]
- ^The characteristic impedance of a transmission line is given by . There are two important transition frequencies related this equation: and . Typically we have and the corner frequency (or break frequency) is defined as because at frequencies greater than the familiar 'lossless' relation for characteristic impedance holds true to excellent approximation. Unfortunately neither of the terms corner frequency nor break frequency are consistently used in the literature. Most often these frequencies are not given any special name, and the topic itself is glossed over in most modern texts.[20]
References[edit]
- ^'Additional Transmission Performance Guidelines for 4-pair 100 v category 5 Cabling'(PDF). Retrieved 2013-05-12.
- ^'Ethernet Cable Identification and Use'. Donutey. Archived from the original on 2011-07-10. Retrieved 2011-04-01.
- ^'ANSI/TIA/EIA-568-B.1-2001 Approved: April 12, 2001 ; Commercial Building Telecommunications Cabling Standard Part 1: General Requirements'(PDF). 090917 nag.ru
- ^Trulove 2005, pp. 23, 132: ‘Designing LAN Wiring Systems: The 8-pin modular jack is sometimes referred to as an 'RJ-45', because the connector/jack components are the same. However, RJ-45 actually applies to a special purpose jack configuration that is not used in LAN or standard telephone wiring. […] Work Area Outlets: Modular jacks are often referred to as 'RJ-45' jacks. This is not really the correct moniker, although it is in very common use.’
- ^Oliviero, Andrew; Woodward, Bill (July 20, 2009). 'Connectors'. Cabling: The Complete Guide to Copper and Fiber-Optic Networking (4th ed.). Sybex. p. 294. ISBN0-470-47707-5.
The RJ (registered jack) prefix is one of the most widely (and incorrectly) used prefixes in the computer industry; nearly everyone, including people working for cabling companies, is guilty of referring to an eight-position modular jack (sometimes called an 8P8C) as an RJ-45.
- ^Semenov, Andrey B.; Strizhakov, Stanislav K.; Suncheley, Igor R. (October 3, 2002). 'Electrical Cable Connectors'. Structured cable systems. Springer. p. 129. ISBN3-540-43000-8.
The traditional 8-contact connector, which is called Western Plug, 8PMJ (8-position modular jack), 8P8C (8 position 8 conductor), or somewhat incorrectly RJ-45, is used widely in SCS practice.
- ^'Understanding Cat - 5 Cables'(PDF). Satelliete & Cable TV. Retrieved 2013-01-05'.'
- ^'Cat5 Spec, cat6 specs, cat7 spec - Definitions, Comparison, Specifications'. TEC Datawire. Retrieved 2013-01-05'.'
- ^'Comparison between CAT 5, CAT 5e, CAT 6, CAT 7 Cables'.
- ^ ab'Voice and Data Cabling & Wiring Installations'. Retrieved 2013-05-12.
- ^'Transmitting video over CAT 5 cable'. EE Times. 2005-06-08. Retrieved 2013-12-07.
- ^'Hack your House: Run Both Ethernet and Phone Over Existing Cat 5 Cable'. Retrieved 2016-08-15.
- ^'LAN and Telephones'. zytrax. October 21, 2015.
Since 10base-T or 100base-TX wiring uses 2 pairs (4 wires) and each analog phone connection uses a single pair (2 wires) you can, subject to limitations, run 2 telephone connections and LAN traffic on category 5(e) wiring.
- ^'Cable Sharing in Commercial Building Environments: Reducing Cost, Simplifying Cable Management, and Converging Applications onto Twisted-Pair Media'. Siemon. Retrieved 2014-04-28.
- ^'RJ45/RJ11 Network Cable Splitters for Ethernet and Phone Line Sharing'.
carry one old fashioned analog telephone signal and one 10/100Mbps Ethernet signal by the same single network cable.
- ^'ATS 10/100 Base T Splitter Adapters'. Duxcw.com. Retrieved 2014-08-17.
- ^HDBaseT Alliance (January 9, 2013). 'HDBaseT Alliance Shows the Future of Connected Home Entertainment at CES 2013'. Retrieved 2017-10-31.
- ^ abcdefghijk'SuperCat OUTDOOR CAT 5e U/UTP'(PDF). Archived from the original(PDF) on 2012-03-16.
- ^ ab'Transmission Line Zo'.
- ^Jim Brown. 'Transmission Lines at Audio Frequencies, and a Bit of History'(PDF). Audio Systems Group, Inc.
- ^ ab'Wire Gauge and Current Limits Including Skin Depth and Strength'. PowerStream. Retrieved 2013-05-12.
- ^IEEE 802.3at-2009 Table 33-11
- ^'Copper Data Cables'(PDF). p. 6. Archived from the original(PDF) on 2006-06-25.
- ^'UTP-STP Cable'(PDF). Retrieved 2016-08-18.
- ^'Selecting coax and twisted-pair cable'. Electronic Products. Archived from the original on 2009-02-01.
- ^'Category 5'. Archived from the original on 2013-06-01. Retrieved 2013-05-12.
- ^'The Evolution of Copper Cabling Systems from Cat 5 to Cat 5e to Cat 6'(PDF). Panduit. 2004-02-27. Archived from the original(PDF) on 2013-03-14. Retrieved 2013-05-12.
- ^'UTP technology'(PDF). Extron Electronics. 2001. Retrieved 2013-05-12.
- ^'CAT 5e Cable Wiring Schemes'. B&B Electronics. Archived from the original on 2012-10-05.
- ^'IEEE Std 802.3-2008'. Institute of Electrical and Electronics Engineers. 2008. Table 13-1
- ^'Horizontal Cabling'. The Network Encyclopedia. Retrieved 2013-05-12.
- ^'ANSI/TIA/EIA-568-B.2-2001, Commercial Building Telecommunications Cabling Standard'(PDF). p. 6 ¶4.3.2.
- ^As noted in ANSI/TIA/EIA-568-B-2 standard for backbone applications
- ^Brooke Clarke, 'CAT 5 Wire Measurements', Transmission Line Zo vs. Frequency, retrieved 2017-08-12
- ^'Technical Information'(PDF). Belden. p. 22.20. Archived from the original(PDF) on 2006-10-20.
- ^'CSA Flame Test Ratings'. Retrieved 2013-05-12.
- ^'What are the differences between PVC, riser and plenum-rated cables?'. Archived from the original on 2011-07-13.[self-published source?]
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