Questions tagged [cable]

For questions about physical cables used in a computer network topology. This tag is suitable when your question is about a network cable. Examples: Twisted pair cable, Fiber optic cable, Coaxial cable, Patch cable and other specialized network cables.

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39 views

Robust Ethernet connection next to high power machines

We are creating a robot for facade treatment (cleaning, painting, drilling). I have few beginner level questions. An industrial robot with it's controller and our computer is placed at the top of a ...
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0answers
16 views

Mellanox MFA2P10 at 10G [closed]

I am running a Mellanox MFA2P10-A030 between a Mikrotik switch and a Supermicro Superserver, but when I put in the transceivers no lights come up on the SFP+ ports. I have tried the ports with a DAC ...
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1answer
20 views

Is fiber to computer(without the use of any other cables in between) possible?? Are any further developments getting carried out towards this goal? [closed]

All of us know well that the fiber to home(FTTH) connections are a trend nowadays. Every nation is planning to replace the existing metal wires with optical fiber cables. But we also see that the ...
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3answers
4k views

Why does an Ethernet cable have four pairs?

I'm curious about why 10Base-T and then 100Base-T Ethernet networks used cables which had four pairs if they only needed two? Were there some cables that only had two pairs? If we wanted to increase ...
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1answer
36 views

Is there a network cable tester device that tests the cables with realistic frequency instead of on/off leds?

I am not looking for a specific product recommendation. I am looking for a category of cable tester devices, so I can do a targeted search. I have an rj45 cable tester that tests the ethernet cables ...
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1answer
30 views

How do i prevent dataloss, when installing an ethernet cable fairly close to an electric cable? [duplicate]

I want to install an ethernet cable and an electric cable (230V) right next to each other (same cable tube, currently 20mm in diameter, length up to 100m (i think its under 75m but i didn't measure ...
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0answers
26 views

Underground fiber installation terminologies

I am analyzing some documents from the city containing comments about underground network equipment installation. One of the comments that appear a lot is "MH ACCESS - ROD ROPE AND PLACE IPP"...
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1answer
47 views

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 ...
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1answer
77 views

How is data flow in a twisted pair cable?

If i use a ethernet cable (twisted pair cable) in what form the data is flowing - digital or analog signal. And in pair 1 that is wire no 1,2 there is transmit+, transmit- respectively. how is pair 1 ...
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1answer
42 views

Are there any advantages of using a crossover cable to directly connect modern devices?

Modern devices no longer need a crossover cable to directly connect via an ethernet cable. But are there any advantages of using a crossover cable anyway? For example, does a crossover cable decrease ...
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1answer
36 views

What does "inline" mean in the context of cable testing?

I hope the title is self explanatory. I was unable to find anything about the term on google however my intuition says that an "inline" tester would intercept some signals going from A to B ...
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1answer
19 views

What causes a media converter to turn on the Link LED for 100BASE-FX

I'm working on a custom board with Texas Instruments DP83822 PHY and 100BASE-FX SFP transceiver. This is connected to a media converter via mmF fiber. The link led on the media converter never comes ...
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1answer
38 views

Two routers connected with a serial line, why they can ping each other without clock rate setting?

I'm pretty new to networking and still learning CCNA stuff. I'm reading a book and as I understand, when you are connecting two routers using a serial line, one router is considered DCE and the other ...
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0answers
90 views

Issues (and spec check) regarding terminating solid core ethernet cable

Tomorrow I'm installing a TP-Link TL-SG1008MP 8-Port Gigabit PoE+ Ethernet Switch to an existing network, powering a TP-Link OC200 Omada AP controller and three TP-Link EAP225-Outdoor access points ...
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1answer
76 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 ...
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0answers
17 views

(Interpretation of) Maximum cable length on Ethernet [duplicate]

As far as I understand the max. cable length applies to the length between devices (e.g. switches, repeaters etc.). Here I found the following citation: For 10BASE-T, Clause 14.1.1.1 Medium ...
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2answers
383 views

Can I use CAT6e on a CAT6 Patch panel?

I have a customer that is set on using CAT6e cables throughout his building. My job is to terminate the ends into patch panels. Can't really find any info if CAT6e will get the full 10GBPS at 100 ...
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1answer
87 views

What clear substance could be sprayed on RJ45 Ethernet terminals? [closed]

As installed by Verizon, the cat5e/cat6 cable does not plug directly into the Ethernet port of the unit. Instead, there are terminals for each wire pair (see photo). If one were to open the snap-close ...
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2answers
202 views

How to check cable without ping?

Is there any way to check if a network link is physically working, without using ping? Recently bought a Power-Line-Communication device, and I wanted to test if it works. Before pinging the machines ...
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3answers
751 views

How can twinaxial cables be faster than CAT cables

I've recently discovered that twinaxial cables can have very high transfer speeds of 100gbps. Even the ancient technology of RG-6 can get gigabit speeds with moca. The thing I don't understand is why ...
6
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2answers
319 views

Can you become your own ISP?

How exactly does an ISP connect you to the vast network of computers which is the internet? In my area there are several ISP's. For example. Bell, Rogers, and Cogeco all connect you to the "same ...
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0answers
63 views

Is there a meaningful difference between Cat8x, Cat7x, and Cat6x rated RJ45 connectors?

Most shielded higher-end RJ45 connectors for cat6 are still shielded and gold-plated, as are cat7 and cat8. I've looked for any references; but every search I run is just about the cabling. So, I'm ...
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2answers
73 views

Is it better to put a switch between the router and a host when running a long wire?

I want to run a 90m cable from my main router to a host. It will work, as 90m does not exceed the maximum length allowed. Router --(50m)--> Switch --(40m)--> Host A If the cable is long or has ...
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2answers
83 views

Are the submarine cables used only for internet?

We can see that almost all of the servers are interconnected between each others using submarine cables which ends in a complete hierarchy but question is are those internet connected cables are used ...
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0answers
384 views

Cisco Time-Domain Reflectometer (TDR) returns cable length of 65535 meters?

Something very strange here. Today I noticed a device was unreachable. Giving a look at the switch it connects to (Cisco 3750, version 12.2(35)SE5), the port was in err-disabled due to link-flap: #sh ...
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0answers
26 views

Manually break ethernet frames [closed]

i have the next question: how can i manually create interference in fast ethernet cable or download the special program which will randomly corrupt ethernet frames (OS is not important)?
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1answer
154 views

Is there any difference between International and United States patch cable?

I'm looking to buy a Cat 8 patch cable. I found a cable that I like that meets ISO/IEC 11801 Class I and Class II but it is not compliant to TIA Cat8 (As defined in ANSI/TIA-568.2-D) which has ...
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4answers
185 views

does fiber optic transmit data as fast as light?

I dont know where to ask this question. So i think its best suited for networking community. As fiber optic transmit data using light. So we are getting/sending data at the speed of light ?? I did ...
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1answer
49 views

How to use twisted pair as console to manage Cisco devices?

Is this possible to use a normal twisted pair cable or roll over to manage Cisco devices through console port? (without any converter to USB) I tested before a roll over and connected it to Cisco ...
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2answers
112 views

How to connect to the console router with limited length of roll-over cable?

Here is the full question: I have a roll-over cable with length only 5 m and I want to connect it to the console of the cisco router that is 20 m far. How can I solve this?
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2answers
439 views

SFP/SFP+: Extender? F/F panel passthrough?

My primary question is this: Is it possible to have a simple passive SFP/SFP+ bulkhead passthrough connector, with two female SFP/SFP+ sockets facing opposite directions and wired directly together, ...
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1answer
90 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 ...
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2answers
2k views

Fiber to copper conversion, what are the odds?

My ISP says they bring optical fiber to their junction box outside and they bring the copper cable inside from the junction box. And they're promising a symmetrical bandwidth with a speed upto 50MBps. ...
2
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1answer
59 views

Reliable transfer but unreliable auto-negotiation?

I have two servers, the first with a built-in and add-on 10gbit port, and the second with built-in gbit and add-on 10gbit (Syba AQC107), communicating through a feed-through rated for gigabit ...
2
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1answer
19 views

Electromagnetic noise affecting data transfer

What is "electromagnetic noise" that corrupts data? Decibel was about levels of noise What do we mean 90db weakening?
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2answers
949 views

How to extend CAT6 ethernet 2m from ceiling down to server rack?

Previously, we had a 6RU comms cabinet near the ceiling. We've now replaced this with a full-depth server rack sitting on the ground. The plan was to remove the old patch panel, and punch it down ...
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2answers
215 views

Unknown Network cable

recently I found a cable in my drawer which one side has a RJ45 connector with an unknown color code of red brown black white green I tried to solve it by myself but I couldn't so I upload a picture ...
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2answers
354 views

Cat6A Junction Boxes in the US

I'm looking around the internet and can't seem to find a Cat6A junction box available in the US. Is there a reason they aren't sold in the US? Basically, I have a Cat6A cable that is run to the wrong ...
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1answer
417 views

Cat 6 life expectancy [closed]

how long will cat 6 cable survive outside if it is not an external grade cable. No sunlight touches the cable but only cold temperatures of around -10c, everyday every year. the cable has no holes, ...
3
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4answers
821 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 ...
4
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2answers
189 views

Noticeable limitations or penalties from using inline fiber couplers

Is there any noticeable limitations or penalties from using inline fiber couplers, such as those in a patch panel to join multiple fiber runs together? Currently I have switches joined together ...
1
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1answer
53 views

Influence of a TAP

I want to use a passive TAP to sniff all the network (100 Mbps full duplex twisted pair). I have two interfaces for sniffing and only one pair for each direction. Will the TAP add any noise? Or if I ...
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4answers
638 views

Why RJ45 8-Pin (Cross Connection) is used instead of Straight Connection between 2 computers or Network [duplicate]

I am kind of new in networking. I want to ask a question about a distinguishment of 2 connection- RJ45 8-Pin Straight Connection I am astonished why RJ45 8-Pin connection was configured from the ...
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1answer
173 views

Is a fiber optic connection considered a "wired" connection?

https://en.wikipedia.org/wiki/IEEE_802.3 As Wikipedia says, 802.3 is for ..."wired Ethernet". How can I name copper and fiber networks in one word to describe 802.3 standard and to distinguish from ...
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1answer
37 views

How cable connects to server if routers and switches are virtualized

Looking here for an example, I see: Spine Device Interface Summary As previously stated, the validated design includes up to 4 spine devices and up to 96 leaf devices that are interconnected by ...
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2answers
28k views

RJ45 Cable only has 4 wires

The cable that connects to my rj45 only has 4 cables, blue, orange, blue stripe, orange stripe. When I connect them to their corresponding ports, there is no internet connection.(Blue = 4, Orange = 6, ...
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3answers
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 ...
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2answers
165 views

Practical limits of shielded Ethernet cable

If I run S/FTP Ethernet cable ran next to 120V conductors (inside 3/4" conduit) for about 70 ft. is there chance that I'll have a usable data connection? I'm fully aware that this is a terrible way to ...
5
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2answers
2k views

Does it work to use CAT6 cable between two CAT5 cables?

I have two Cat 5 cables pre-installed in the walls. I need to connect two rooms, in which each room has its own set of in-wall Cat 5 cables and a slots. Does it work to use a Cat 6 cable to connect ...
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2answers
354 views

What can I infer about a network connection using a cable tester (if anything)

I have a NS-468 cable tester for testing cables. This works fine but if I connect just one end of a RJ45 cable to a network, I only get 4 lights. This seems reasonable as I suppose 4 pins are for ...

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