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23 votes
Accepted

What is this thread-like material on this Cat6 U/UTP cable?

It is used to split the outer shielding away without needing to use a sharp object which could potentially damage the wires themselves. It is commonly called a ripcord. Image taken from http://netx....
  • 346
22 votes

What's the difference between an Ethernet cable and a UTP cable?

The accurate answer is that they are not Ethernet cables. The cables themselves are not limited to transmitting Ethernet, nor is Ethernet restricted to using just UTP cables. In the first case, they ...
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15 votes
Accepted

What is the reason for T568A and T568B termination?

UTP cables used in the 586 standard inherited their color code from the 25 pair color code developed by AT&T for cabling used in telecommunication purposes. The following table shows the ...
  • 4,437
14 votes

How exactly does an Ethernet collision happen in the cable, since nodes use different circuits for Tx and Rx?

A hub is really just a powered cable that repeats every signal it receives on one interface to all the other interfaces. If two devices transmit at the same time to the receive of the hub interfaces, ...
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13 votes
Accepted

How exactly does an Ethernet collision happen in the cable, since nodes use different circuits for Tx and Rx?

To understand this you need to understand the historical context. Originally Ethernet used a shared coaxial cable. Only one device could successfully transmit on this at a time. If two devices ...
  • 11.8k
12 votes

What does the naming convention for Ethernet standards mean: 1000BASE-T, BASE-TX, BASE-SX, etc.? What is the meaning of the components of the name?

BASE indicates baseband signaling - there is no modulated carrier, the frequency starts near zero and extends to a certain cut-off frequency. BROAD indicates broadband modulation - there is a wide ...
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10 votes
Accepted

How to create Ethernet cables when I cannot figure out color of cat 5e cable wires?

The colors are just there as an ease-of-use tool. What really matters from a functional standpoint is what cable is connected in the jack in what position. Electrically the colors of the wires make ...
10 votes
Accepted

Multiple POE over a single cable

I know this is an older question, hopefully you've solved it by now, but I wanted to toss in my two cents, for the benefit of future generations if nothing else. First of all, yes, ethernet and PoE ...
  • 116
10 votes

What does the naming convention for Ethernet standards mean: 1000BASE-T, BASE-TX, BASE-SX, etc.? What is the meaning of the components of the name?

The first number represents the speed. If the next part is "BASE", then it is baseband. If it is "BROAD", then it is broadband. This is the original meaning of baseband/broadband, not the government ...
  • 94.6k
9 votes

What is this thread-like material on this Cat6 U/UTP cable?

Its called a ripcord and is used to cut thru the outer casing of the wire so you don't have to use a knife. To those who say it is not strong enough your not using it right. Grab it with a pair of ...
9 votes

How exactly does an Ethernet collision happen in the cable, since nodes use different circuits for Tx and Rx?

Great question. In full duplex, there is a dedicated channel for traffic from "left to right" and a dedicated channel from traffic from "right to left": Therefore, in full duplex, collisions are ...
  • 14.1k
8 votes

What is the reason for T568A and T568B termination?

It is actually a very trivial and straighforward reason. The standard starts with a single pair, two pins in the middle. This expands to a 4 pin plug for two pairs. What happens if you plan the ...
  • 180
7 votes

Why do we need a crossover cable for 1000BASE-T?

Short answer: you don't. 1000BASE-T requires Auto Negotiation to work - the fast link pulses are to be transmitted and received on specific pairs, compatible with 10BASE-T and 100BASE-TX. In theory, ...
  • 72.9k
7 votes

What is the difference between Ethernet types, considering bandwidth?

Different types of Ethernet (standard Ethernet, Fast Ethernet, Gigabit Ethernet) have different speed of data transfer (10 Mbit, 100 Mbit, 1 Gbit). Why is that? Progress - technology advances. ...
  • 72.9k
6 votes
Accepted

Will cutting a 50m CAT6 cable in half achieve a gigabit connection?

Cat6 can provide Gigabit speeds up to 90+ meters. It is far more likely that one of the terminations is the problem. Gigabit requires the use of all 8 wires, so if one (or both) of the terminations ...
  • 26.8k
6 votes

What's the difference between an Ethernet cable and a UTP cable?

Some distinctions and history: Ethernet and other networking systems can use a variety of physical media, including fiber optic and metallic wires. Since the wires are almost always made of copper, ...
6 votes

How exactly does an Ethernet collision happen in the cable, since nodes use different circuits for Tx and Rx?

With twisted pair and a repeater hub, the hub is not much more than a digital amplifier. For that it senses a carrier from an incoming signal on one port and switches all other ports to output mode. ...
  • 72.9k
5 votes

Is ethernet a term describing just the protocol or the interfaces also?

The IEEE 802.3 standards define certain L1 characteristics/operation, but do not define the connectors to use to connect the devices. For instance, while 802.3 does define that 100BASE-TX will use ...
  • 26.8k
5 votes
Accepted

Externally Rated - CAT Cables - how to tell

No common usage cable is rated for exposure to the natural elements. If it isn't going to be used inside of a home or environment-controlled switching office, it either needs to be specially ordered, ...
5 votes

Why are patch panels used (instead of connecting directly to a switch)?

The horizontal cable needs to be solid-core cable. this type of cable gives better performance, but it is much more fragile, and it needs to to terminate in a fixed location, and not be moved after ...
  • 94.6k
5 votes

Is it possible to set a 3 computers LAN using just cables?

It's theoretically possible if one of the computers has two network interfaces. Otherwise, how would you connect them all? But that would be a kludge at best. If you are actually thinking about ...
  • 63.6k
5 votes

Is there an IEEE recognized method for splicing Category 5e or 6 cabling?

Copper cable splices are not allowed. Cabling standards are set by ANSI/TIA/EIA 568 Commercial Building Telecommunications Cabling Standard. For instance, this is for copper cabling: Only one ...
  • 94.6k
5 votes
Accepted

When is "grounding" a concern when running Cat6a cables?

Category-6a cabling is UTP (Unshielded Twisted Pair) cabling. If your cable has a shield, it is something else. Any shielded cable must be properly grounded. That requires connectors and equipment ...
  • 94.6k
5 votes
Accepted

10baseT and 10baseFX difference

10BaseT and 10BaseFx are standards of connectivity for Ethernet. 10BaseT defines the use of twisted pair cabling (UTP / STP) for Ethernet, that includes cable features, male (in cable) and female (in ...
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5 votes
Accepted

Which is preferred: Pulling or 'walking' cable?

The usual way to do this is once you have properly set up your pathways (see ANSI/TIA/EIA 569 Telecommunications Pathways and Spaces) is to have a pull-string. You use the pull-string to pull the ...
  • 94.6k
5 votes

Which is preferred: Pulling or 'walking' cable?

I entirely agree with previous answer that you really want a professional outfit with the correct test gear to properly pull, terminate, label and test each wire. And redo anything that fails certs. ...
  • 15.9k
5 votes

Where are UTP cable speeds defined for Ethernet?

However, I'm having trouble finding a definitive source for the recommended transmission speed for Cat 3, Cat, Cat 5e, Cat6, and Cat6a twisted pair cables. In fact, some of these sources seem to ...
  • 26.8k
5 votes

What is this thread-like material on this Cat6 U/UTP cable?

It has nothing to do with grounding or shielding -- those have to be metal, or metalised plastic. Cables often have all kinds of filler materials to do with Manufacturing processes Handling ...
  • 15.9k
5 votes

Does 10BASE-T contain four wire pairs or two-wire pairs and why is it if it's four wire pairs?

You are correct that 10Base-T and 100Base-Tx use two pairs for communication, while 1000Base-T uses all four. You may be confused because you're conflating different standards for different items. ...
  • 63.6k

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