Hot answers tagged

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....
helrich's user avatar
  • 346
17 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 ...
jcbermu's user avatar
  • 4,497
15 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, ...
Ron Maupin's user avatar
  • 99.4k
15 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 ...
Peter Green's user avatar
  • 13.3k
13 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 ...
Zac67's user avatar
  • 83.9k
11 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 ...
Eddie's user avatar
  • 15k
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 ...
Soundy's user avatar
  • 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 ...
Ron Maupin's user avatar
  • 99.4k
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 ...
user51151's user avatar
8 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 ...
Ron Maupin's user avatar
  • 99.4k
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 ...
Asmyldof's user avatar
  • 180
8 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, ...
Zac67's user avatar
  • 83.9k
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. ...
Zac67's user avatar
  • 83.9k
6 votes

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

There's several reasons: Cable Length and rack organization as explained by @John K in his answer this allow to adjust cable length at need. This also allow to organize the rack properly. Cable ...
JFL's user avatar
  • 19.6k
6 votes

Are there any advantages in using optic fiber to connect a host computer to an Ethernet LAN?

There's several advantages to Fiber-to-the-desk length: copper cabling is limited to 90 meters of horizontal cabling (leaving 10 meters for patching). Fiber doesn't have this limitation. In some ...
JFL's user avatar
  • 19.6k
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. ...
Zac67's user avatar
  • 83.9k
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 ...
YLearn's user avatar
  • 27.3k
5 votes

Multiple POE over a single cable

If 100 Mbit/s is enough for camera to work, You can try split single 4-pairs cat5 cable in two 2-pairs links. It can be done by 2 Ethernet splitter or by proper cable crimping. "This adapter brings 4-...
mmv-ru's user avatar
  • 774
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 ...
Ron Trunk's user avatar
  • 67.3k
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 ...
Ron Maupin's user avatar
  • 99.4k
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 ...
Ron Maupin's user avatar
  • 99.4k
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 ...
jcbermu's user avatar
  • 4,497
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 ...
Ron Maupin's user avatar
  • 99.4k
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. ...
jonathanjo's user avatar
  • 16.2k
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 ...
YLearn's user avatar
  • 27.3k
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 ...
jonathanjo's user avatar
  • 16.2k
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. ...
Ron Trunk's user avatar
  • 67.3k
4 votes
Accepted

Direct-burial cable: fiber vs cat-5e/ cat6

In my personal experience "interference from power lines" is more of a marketing myth than reality with twisted pair cable, which is actually highly resistant to interference pickup, by design. But ...
Ecnerwal's user avatar
  • 2,746
4 votes

Is there a difference between using a cat 6 wall jack vs using a female-to-female connector?

Both will work fine. They're called keystone jacks and snap into a keystone wall plate with one, two, four...openings. The first option requires a punchdown tool to punch your conductors into place ...
Ted Quanstrom's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible