# Questions tagged [utp]

For questions about Unshielded twisted pair (UTP) cabling, where it should always be in relation to networking in general.

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

As far as I know, 10BASE-T and 100BASE-T (types of UTP) use two pairs of wires, while 1000BASE-T has four pairs of wires. But when I look up the photo of 10BASE-T on google, it indeed contains four ...
79 views

### Calculating stranded and solid cable length (for 22AWG)

Reading up on how to calculate cable lengths as a follow-up to my previous question, I understand that you have to use (102-H)/(1+D) to calculated the stranded length (C) and H+C to calculate the ...
197 views

### Copper or Glass for Low Latency?

I'd like to preface the main content of this post with the following: I understand this question may be equally suited to the Physics Stack Exchange, and so I have posted on there as well, but maybe a ...
96 views

### Multiple virtual UTP cables over one physical?

Say there is a physical UTP cable running from point A to point B. At A there are two physically isolated devices, a1 and a2, each running their own network and unaware of each other's existence. So ...
587 views

### UTP 1236 wiring [closed]

can someone tell why UTP 10/100 is wired 1236? why not 1234, 3456, 5678? (i know that on old adapters only 1236 pins were connected) which was the rationale of 1236?
8k views

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

I am trying to understand how a collision occurs in Ethernet, especially when a duplex mismatch exists or when on a legacy Ethernet network two nodes transmit simultaneously. Everyone explains the ...
846 views

### 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? On the physical layer, the speed of ...
1k views

### A reason why Ethernet has maximum cable length confuses me

The answer in this post suggests that it has two reasons. While the impedance characteristics of a transmission line become less favorable for high speed data as the line gets longer (resistance ...
6k views

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

Does anyone know what this thread-like material to the right on the picture is? Does it have anything to do with grounding? It is a Cat6 U/UTP cable.
167 views

### What type of Cat5e cable is this?

I am a fairly new networker and today I was terminating some cable at a gas station that is being built. The network cable that had been run from the gas pumps to the wiring closet confused the crap ...
395 views

### How to avoid cable crosstalk?

I have 4 ADSL UTP cables. How much distance do I need to leave between cables to avoid crosstalk?
198 views

### Use of UTP patch cables on a STP cabled network [duplicate]

In the walls of the building there are Cat6a FTP cables. Can we use Cat6 UTP patch cables to our switches, and maintain 1Gbs speed? Or do we need to use FTP cables all the way from switch to end ...
1k views

### How close can Ethernet cables be to power line if in parallel?

How close can unshielded CAT 5e/6/6a cables be in parallel to 110V power lines in rooms of common residential/commercial buildings before interference becomes an issue? If proximity between the two ...
2k views

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

I'm doing course for CCNA and in one lecture teacher showed how to make a crossover cable for Gigabit Ethernet. But as I know Gigabit Ethernet uses all wires of twisted pair cable and each pair is ...
123 views

### Cat 5e wiring Type A incompatibility with Type B

I am not an engineer but I’m having problems with my small network in my business. I have 11 computers after 13 yrs am having major problems. My network keeps shutting down, and my dental software on ...
342 views

### Where are UTP cable speeds defined for Ethernet?

I have consulted several Network+ exam preparation books, Network+ practice exam questions, the IEEE 802.3-2015 standard, and several older TIA-568 standards. However, I'm having trouble finding a ...
191 views

### What classifies as crossover cable?

The definitions I've read say that crossover cable is cabling which the receive and transmit pairs are swapped around. My question is based on the fact that beyond this, I've seen some diagrams which ...
187 views

### Which is preferred: Pulling or 'walking' cable?

I'm running some basic lines at a factory and I have basic training on punchdowns and where I am allowed to run the cable(in this case, CAT5e/6). I need to run a maximum of about 200 feet of cable. ...
10k views

### Why exactly is soldering discouraged in UTP networks?

I am aware that punch-down junction boxes and other solutions are the recommended methods for continuing an UTP cable that is too short, but you are not in control of replacing (for example, solid-...
197 views

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

I saw that computer Network Interface Cards (NICs) that use fiber ports (SFP) instead of RJ-45 ports and I wonder if there would be any significant advantage in connecting the computers directly ...
2k views

### 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?

I understand the number in the naming convention. The number represents how many Megabits per second can the standard support. However, I do not understand the rest of the naming convention. What do "...
2k views

### 10baseT and 10baseFX difference

What is the difference between 10baseT and 10baseFx are those types of cables or the boxes that are used to plug the cables?
1k views

### Poor bandwidth after re-coupling an Ethernet cable

As part of an experiment I cut a Cat 5e Ethernet cable in half, stripped off a small amount of insulation on each wire and attached each pair of wires together with its own alligator clip. There are ...
13k views

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

I'm educating myself on how to terminate Cat 6a cables. I've seen some articles talk about "grounding" requirements because of the "shielding" in the cables. But is grounding a concern if I'm just ...
2k views

### Can I run two separate internet connections over one Cat5e cable

I have two ISP's coming into the building. One is a T1 that is going to be used for VOIP phones. The second is high speed internet connection going to be used for internet. Each office has one cat5e ...
390 views

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

Is there an IEEE recognized method for splicing Category 5e or 6 cabling, and maintaining the expected data rates? Such as the junction box shown in the link below. https://www.lowvoltagecables.com/...
151 views

### PoE cable defective?

Need some expert advice.. So some time ago I got water damage, my PoE switch was completely flooded. Since then, I noticed that I could not rotate my cameras anymore via Blue Iris (IP Cam soft), and ...
370 views

### Connecting a router with cat 5 cable to a cat 7 network

I have a cat 7 network but the router, switch and APs are hooked up to it using cat 5 cables. Does this reduce the advantages of a cat 7 network?
110 views

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

I'm absurdly new on networking, and I just want to know if it possible to set a network with 3 computers without a router, switch; just UTP CAT5 cables (or any category)
147 views

### Will Cat6 make a difference

I have 7 rooms wired with Cat5e. I plan to attach the other end of the cables to a GigaBit switch (Netgear GS108). This leaves one port on the switch. I will attach my router to the remaining port. I ...
14k views

### What is the reason for T568A and T568B termination?

There are two types of pinouts for terminating twisted pair cable with a 8P8C (RJ45) connector: But why must one not simply align the wires serially, e.g: Green pair - Orange pair - Blue pair - ...
5k views

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

For example, at work, a network is made up of 10 workstations all connected to a switch through a patch panel. From my inexperienced opinion, it is extra cost that can be avoided; however, as I do ...
4k views

### Difference between patch cable and UTP

I already searched for answer to this, but I have seen so many different answers to this.. Does patch cable mean all UTP Cat5e, Cat6 etc? Or is it something else? Thank you for any help.
2k views

### Does the 568A vs 568B standard affect the transmitting and receiving wires on the CAT-5 cable?

So I'm studying networking using the Head First Networking book. I was reading about CAT-5 cable and the RJ-45 connector. The book says that the green pair receives data and the orange pair transmits ...
150 views

### What is your experience using 3rd-Party 10Gig Media Converters with Cisco equipment?

We have just received a device with 10Gig BaseT ports (for copper cable with RJ45 endings) that needs to be connected to a Cisco Nexus 5548. This switch only has SFP+ ports and we're connecting them ...
775 views

### Flexibility of a UTP cable

Is there a metric/specification that shows flexibility/elasticity of a utp cable? I have to install a utp cable and it will have to go around some sharp corners. From what little experience I have ...
30k views

### Multiple POE over a single cable

I try to solve a problem using Power Over Ethernet technology to Power supply differents devices. I would like to avoid to buy new router and try to make it work without any expensive costs (if ...
745 views

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

Apologies if this isn't the right place for this question. I'm converting an out-building to a home office. The structure is approximately 175 feet from the house. We're digging a trench for a 240V ...
637 views

### Patch cable wiring/colors

I cut a cat5e patch cable to put a female end on the cable, but the colors for the male piece are: orange, orange/white, blue, blue/white, green, green/white, brown, brown/white. The patch cable ...
676 views

### New crimped UTP cable connects and disconnects

I was just making new short UTP cables, and I was happy that when I checked the cable through an Ethernet Cable Tester, all 8 wires were straight to each other and was perfect. When I plugged the UTP ...
16k views

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

I am running new cat 6 cable from my router to my office so I can get my computer hardwired instead of using WiFi. When looking at what I need to get to connect the cable to a wall plate, I'm seeing 2 ...
1k views

### Why is the 100base-TX maximum distance unchanged from the original specification on better cable?

I understand that the 100base-TX Ethernet standard is from 1995, and was originally designed for older and poorer grade CAT-5 cabling than what is now commonly available. With the introduction of the ...
678 views

### Is it possible to carry POTS and gigabit ethernet over the same Cat 5e/6 cable?

I know that gigabit ethernet needs to use all four pairs of wires. The idea is that POTS is such low frequency that I believe it should be possible to separate it from the gigabit signal using a ...
163 views

### Will using phone lines (RJ-11) in place of ethernet (RJ-45), in this case, be detrimental to performance?

My company has begun leasing new office space, and our modem was installed in a room without ethernet, a little ways from the router. There is a bundle of unused telephone lines (RJ-11) which run ...
47 views

### Category-6 cable for CCTV [closed]

T568A or T568B? Which one (1, 2, or 3)? Straight-through Cross-Over Roll-Over
43 views

### Mixed Use Four-pair Cable

My school tried to save money, so they decide to use an installed cable for phone, CCTV, and ethernet. I used two pairs for ethernet, one for phone, and one for a CCTV camera. The phone and camera ...
140 views

### Would using a cat6 rj45 coupler strip VLAN out when connecting 2 VLAN aware devices ?

Ive got a project where i have to use some existing wiring and some new wiring as we can not run new wiring in one part of the building. At the moment my network diagram looks like this Becuase i ...
304 views

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

Is ethernet describing the protocol and therefore cat5 cables became labelled ethernet cables because they are used for this protocol?