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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Is it possible that not adhering to a standard color coding in ethernet cables would affect performances?

I have two gigabit devices connected to a gigabit switch using cat 5e ethernet cables, but the wirings on the RJ45 connectors do not respect any of the established color standards, because they were ...
leonixyz's user avatar
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Cisco Console Cable DIY

I received today a cisco cap3702i-e-k9 access point, but sadly i dont have any console cable that i can use. Only things i have for now is PL2303, maybe i can combine it with something. Hello. I ...
Henryk Lis's user avatar
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1 answer
133 views

Are integrated networking devices, frequently called routers, of the switch type or of a router / NIC type?

Odom,Wendell-_CCNA_200-301_Official_Cert_Guide,_Volume_1.pdf : many SOHO Ethernet LANs today combine the router and switch into a single device. Vendors sell consumer-grade integrated networking ...
John Smith's user avatar
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Just testing a 2 pair twisted internet cable having 4 wires [duplicate]

I am having a problem with my 2-pair ethernet cable. I have connected the 4th, 5th, 7th, and 8th pins, but the 4th pin is not working. I have checked the RJ45 connector and the cable with a multimeter,...
Zohaib Khan's user avatar
0 votes
2 answers
145 views

Can wrong SFP module damage equipment?

SFP modules convert electrical data from the equipment to optical signals. There is no incoming power surging from an optical port to damage the equipment according to my undarstanding of fibre optics....
SandShriner's user avatar
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1 answer
130 views

Two subnets one cable

I have a single ethernet cable between two buildings. If want to run two subnets, 192.158.1.x and 172.20.1.x. The two devices on the two separate subnets are connected to a layer 2 switch at the far ...
johne's user avatar
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1 answer
77 views

Camera instead of ethernet cables

My electricians messed up and installed some sort of camera (or very old cat3?) cables, instead of the requested ethernet cables (see picture). Now I have two of those, running for about 15 meters ...
dpnv's user avatar
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1 vote
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Identify the cable connector [closed]

Please identify this cable connector by model/part number/supplier. It is a cable between a control box and microprocessor. One photo for scale shows the connector next to an RJ45.
STWilson's user avatar
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3 votes
1 answer
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How do communication networks physically direct traffic? [closed]

I’m curious as to how this would work. I have an ISP that uses Coaxial Cable to deliver its services (this company was one of the original cable TV providers in the neighbourhood, hence why coax and ...
StackQsUp's user avatar
0 votes
2 answers
154 views

How is it technically possible for a straight-through cable to work?

I understand why two computers need a crossover cable between themselves to communicate. Without it, the transmit and receive wires are the same on each end, making any communication impossible. What ...
jrway's user avatar
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1 answer
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Slim Ethernet 28AWG Length Limitation question for IDFs

anyone have experience with the slim ethernet cabling? I see a lot of atricles stating they are limited to around 30ft. Does this footage include the in-wall cat6 run from Patch panel to Desk drop? ...
CableMeThisBatman's user avatar
2 votes
1 answer
407 views

Confusion between MDI and MII

Media Dependent Interface Media Independent Interface My understanding is 2. is an interface between PHY chip and MAC block on the board. PHY chip can be on the board, or detachable. It is rather PHY ...
Taro's user avatar
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2 answers
375 views

Degradation of signal quality as a function of cat 6 cable length

I would like to make a run of cat 6 ethernet cable between 2 dwellings, underground. It appears I may need just a little over the maximum length for 1 Gbps (100 meters), maybe 110 meters or so. ...
KevinHJ's user avatar
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2 votes
1 answer
88 views

Is the RJ45 boot part of the RJ45 design specification?

Like tabs vs spaces, or Pokémon vs Digimon, the RJ45 boot is arguably a cause of controversy for many. Is it, however, in the official design specification for the RJ45 connector, or is it a non-...
James Geddes's user avatar
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2 answers
229 views

can we use RJ45 with cat7 sftp?

I am currently working on connecting ip cameras together . I am using cat7 sftp cable . according to the bellow article : http://www.differencebetween.net/technology/difference-between-rj45-and-rj48/ ...
Sara Haroon's user avatar
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1 answer
355 views

PoE cable into console port

Every guide I read mentions how you can't use PoE supported cable for console port, RJ45 not USB, because you can fry the port but aren't all cat 5e and after cables PoE compatible, and I was always ...
KinkyWizard's user avatar
3 votes
1 answer
117 views

Why would a 285ft Ethernet single segment work at 100Mbit, but not at 1000Mbit

I am trying to install a 1000Mbit segment that is about 285ft long. It works perfectly fine at 100Mbits, but it won't do 1000Mbit. The testing devices (2 computers, 1 switch) have 1000Mbit ports. All ...
nrnoble's user avatar
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2 votes
2 answers
309 views

Fiber minimum bend radius for 12-fiber breakout cable

Minimum fiber bend radius is generally 10 x outer diameter of cable, unless specified differently by the manufacturer. For a tight-buffered indoor fiber breakout cable with 8 or 12 fiber strands, does ...
nepdev's user avatar
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2 answers
1k views

Pins #6 and #8 of my CAT6 ethernet cable are broken. Should I replace the entire cable or is it usable?

I wired up a ~40m long CAT6 cable following T568B pinout. According to my tester, pins #6 and #8 are not functional. I have re-wired both ends several times to make sure it's not my poor crimping; ...
WackGet's user avatar
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2 answers
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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 ...
Thomas LEFORT's user avatar
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1 answer
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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 ...
Mahesh Patil's user avatar
18 votes
3 answers
7k 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 ...
UnderAnOpenSky's user avatar
1 vote
1 answer
634 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 ...
Allan Xu's user avatar
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1 answer
66 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 ...
Andreas M.'s user avatar
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0 answers
31 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"...
user1743182's user avatar
1 vote
1 answer
695 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 ...
Shawn's user avatar
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1 answer
811 views

How does data flow in a twisted-pair cable?

If I use an Ethernet cable (twisted pair cable) in what form is the data flowing - digital or analog signal? And in pair 1, that is wire number 1 and 2, there is Transmit+ and Transmit- respectively. ...
David Roonie's user avatar
1 vote
1 answer
445 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 ...
mark's user avatar
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0 votes
1 answer
99 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 ...
Mantas Kandratavičius's user avatar
1 vote
1 answer
66 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 ...
user74012's user avatar
0 votes
1 answer
349 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 ...
Just a learner's user avatar
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0 answers
475 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 ...
Ben's user avatar
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1 vote
1 answer
159 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 ...
Albin's user avatar
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0 answers
23 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 ...
Albin's user avatar
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0 votes
2 answers
872 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 ...
sci-guy's user avatar
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0 votes
1 answer
139 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 ...
B.C.'s user avatar
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0 votes
2 answers
232 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 ...
ymudyruc's user avatar
2 votes
3 answers
1k 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 ...
mberna's user avatar
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6 votes
2 answers
644 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 ...
Dougie Fuoco's user avatar
0 votes
0 answers
112 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 ...
Phobos Technologies LLC's user avatar
0 votes
2 answers
132 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 ...
Livy's user avatar
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0 votes
2 answers
100 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 ...
Taher's user avatar
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0 votes
0 answers
783 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 ...
kuma's user avatar
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1 vote
0 answers
45 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)?
Mister_Jesus's user avatar
1 vote
1 answer
240 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 ...
Arian Faurtosh's user avatar
1 vote
4 answers
733 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 ...
HungryFodder's user avatar
0 votes
1 answer
85 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 ...
Amir Sabeghi's user avatar
0 votes
2 answers
161 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?
NANA's user avatar
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0 votes
2 answers
1k 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, ...
Dale Mahalko's user avatar
0 votes
1 answer
114 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 ...
Greendrake's user avatar

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