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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3
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3answers
5k views

Can Ethernet use fiber optic cables?

I am new to networking, know about Ethernet and that Ethernet cables exist to make a wired networks. I also know about fiber optic cables which have a glass like material inside and transmit light ...
7
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4answers
1k views

Why is the Ethernet Connection Symmetric?

I know that cable connection (DSL) is asymmetric, there is a certain bandwidth on the channel, and for a better user experience, they allocate a bigger portion to the downstream. I suppose Ethernet ...
2
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2answers
115 views

Effect of large amount of bare ethernet pairs on network performance

I have a client who has been experiencing a significant amount of performance issues in regards to their telemarketing floor. On my initial assessment, I found that where the ethernet is punched down, ...
0
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1answer
2k views

What is the maximum distance that a cable/fiber optic internet connection can operate without the internet quality degrading? [closed]

I hope that this is not an ignorant or misinformed question, I am new and I'm trying to learn more about internet provision. I have read that DSL has a maximum distance of 18,000ft (or 5.5 Km) before ...
2
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0answers
79 views

If cable (coaxial cable TV / cable internet access) is shared, what is preventing DOS attacks? [closed]

If I simply blasted a continuous signal, wouldn't I make the entire network unusable?How do users (modems) even know when they can send their data (is something like CSMA/CD used?)?I assume there's a ...
4
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2answers
344 views

What is the best to simulate an RJ45 cable failure without changing switch configuration or removing the cable?

I am looking at an automation element for a training environment. We would like to be able to fail a cable without doing a shutdown on the interface or having an engineer physically remove the cable ...
1
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1answer
84 views

How to tell if network cable is LSZH

I just bought a 305 meter Cat 6a S/FTP LSZH Solid network cable. The cable I received is a Deltaco TP-53 cable, but I cannot see anywhere that this cable is really LSZH (Low Smoke Zero Halogen). I ...
0
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1answer
71 views

How southern cross cable can transmit IP/ Ethernet signals keeping in mind the physical limitation of Ethernet cables?

The Optical fibre can transmit/receive any ethernet frames or packets faithfully for 5kms. However, the cables laid in the southern cross i.e. under the sea beds must be several miles long. The ...
3
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1answer
2k views

To shield between patch panel and switch or not?

All network cables run from the outlets to the server room. They run next to power cables so it was decided to shield them. In the server room, they are going to be connected to a patch panel which ...
2
votes
1answer
3k views

Best way to replace DSL cable by CAT6 cable

Best way to replace DSL cable by CAT6 cable, to decrease resistances and improve connection. Use 1 pair only. Connect every 2 pairs together. Connect White wires together and Colored wires together. ...
1
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3answers
217 views

Custom CAT6A cable not reaching 1000mpbs

I purchased this CAT6A cable: https://www.amazon.co.uk/gp/product/B01M0VB4YD/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1 and did some network cables by myself in various lengths ranging from 1 ...
3
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2answers
4k views

Cisco Console Cable and HP ProCurve Switches

I have a USB to Cisco console port cable, and as far as i'm aware, its just a standard rollover serial cable. Correct me if i'm wrong? I'm also looking at getting a HP ProCurve 2510-48 J9020A. On the ...
2
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1answer
54 views

Cisco Router 1002f Sfp Port to Cisco swtich c3750 gigabit port

an anyone please instruct me how to connectCcisco router 1002f SFP ports to gigabit ports? I have an RJ45 port on switch side and an SFP port on router side. I like to use switch as dump switch. I ...
3
votes
2answers
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 ...
3
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2answers
105 views

Intermittently loose communication with upstream managed switch

I have a network for a small company that has been running without an issue for a few years. We have Cisco IP phones on VLAN 100 and computers on VLAN 1. The VLANS are auto assigned by the Cisco ...
0
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2answers
501 views

Different line attenuation figures for broadband upload and download [closed]

I would be interested to know why the line attenuation figures differ so much for upstream and downstream communication when the same copper/fibre cable is being used for the link to my house? PS ...
2
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1answer
961 views

Stack cable connection concept in Cisco switch

Can you please share the concept of stack cable connection concept with redundancy and without for all kind of cisco switches, concept for if we have four switches in the same rack and if we have 8 ...
2
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1answer
993 views

Intermittent periods of high packet loss, one hop beyond router

I've been trying to diagnose internet connection issues at a remote small business for which I am the system administrator. If this is not the proper Stack Exchange to post to, I'd really appreciate ...
1
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1answer
420 views

How many stacking cables does a pair of stacked Dell switches need?

According to https://www.dell.com/support/article/us/en/04/how10356/how-to-stack-n2000-or-n3000-switches, when stacking Dell Switches, one should perform the following steps: For each switch in the ...
60
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9answers
21k views

Is 30 Mbit/s fibre faster than 30 Mbit/s copper? [duplicate]

A network engineer professional is overseeing our town's installation of fibre and was explaining how much faster it was. I pointed out that it wasn't a silver bullet as you had to pay the provider ...
1
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2answers
67 views

AOC cables for Brocade Fiberchannel

I have a FC switch from brocade with 16Gb ports and I want to connect to an array enclosure from another vendor. For internal requirements, it should be connected through twinax AOC cables. My problem ...
2
votes
1answer
89 views

Is the patch/crossover type of cable really unimportant in a GBe network on a structured cabling with a passive switch panel?

As known, the Ethernet standard from the GBe range also prescribes the auto-detection of the cable type (in the sense of it is crossover or ordinary cable), thus there is no really need to use ...
1
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4answers
285 views

Can we use two pairs of UTP with hubs?

I understand that hub always supports for half-duplex communication. In that case we should use one out of four UTP pairs. However, I read that for 10BaseT ethernet two pairs of UTP cables are used ...
1
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1answer
56 views

Cable Internet Packet collecting

I've been reading Computer Networking: A top down approach and I don't understand something about cable internet. The book says that since cable internet is a shared medium, every packet sent by the ...
3
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1answer
534 views

What is the purpose of twinax cables and how does it differ from straight through and cross over cables for the connection of unlike and like devices?

What is the purpose of Twinax cables and how does it differ from straight through and cross over cables for the connection of unlike and like devices? I want to know whether there is any difference ...
1
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1answer
501 views

Fibre vs Copper short Distance

I am thinking of running Fibre optic from one room to a Nearby ONT/Router, I currently have about 15-20 meters of Cat 6, With a Gigabit UFB internet plan. With a short distance of around 20 meters ...
1
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2answers
143 views

Cable for 4Gb Fibre Channel

I have two servers with 4Gb Fibre Channel HBA adapters. Looking for cable for them, I found reasonably priced cables that say they're 10Gb. I know that if this was copper, it would be overkill, but I ...
4
votes
1answer
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 ...
1
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2answers
114 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 ...
1
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1answer
215 views

Connecting two PCs together via External Ethernet cards (T568A or T568B?)

Hi, I need some expert networking advise here. I have to connect two different PC together via a unique ethernet path. Please see attach picture. I however cannot go thru a switch or a hub. **my ...
2
votes
1answer
745 views

How does broadcast work in cable networks?

Sorry for the long post. I tried to make it small but couldn't make it any smaller. Any help would be really appreciated. It would be great if you can explain from the basics. In the book "Computer ...
3
votes
1answer
534 views

Does TIA/EIA-568 permit patch cabling totals longer than 10m?

[Light edits to emphasise versions] What are the exact requirements of TIA/EIA 568 cabling standard as regards to the length of patch/work area cables? Specifically, I see from my 2001 copy ANSI/TIA/...
1
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3answers
173 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 ...
4
votes
1answer
276 views

Whats the difference between connecting QSFP+ to QSFP+ and 4xSFP+ to QSFP+ (All DAC)

I'm pretty sure the following should be OK, but I don't have a way of testing before I get on site, so it would be great if anyone can tell me if there is anything specific that I'll need to change in ...
4
votes
2answers
180 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. ...
1
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2answers
133 views

Unknown category of a RJ45 cable

I need to buy some rj45 connectors for the following cable. Unfortunately, I've never seen this type of rj45 cable. From which category comes it? Cat-4, Cat-5, ... Thanks
-1
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3answers
179 views

What was the initial reason to design two different types of Ethernet cables cross-over and straight-through? [duplicate]

I do not understand what was the purpose behind those two cable standards. Cross-over cable and Straight-through cable What was the initial purpose that they were build for and what was the ...
1
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2answers
231 views

Why OM2 fiber has more fiber loss than OM1?

Recently, I am doing some research about OM1 and OM2 fiber. According to the provided information, the OM2 fiber has more loss than OM1, but it doesn't point out the specific reason, just 1 sentence. ...
1
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3answers
2k views

How do 568B-568B and 568A-568A Ethernet wirings work?

I mean I get why 568A-568B works: But why does this not-crossed wiring work?
2
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4answers
3k views

Does coaxial cable transfer data both ways?

Does coaxial cable transfer data both ways although it has 1 wire in it? How coaxial cable is different from Ethernet cables? And why does Ethernet cables have two wires for transmit and two wires ...
1
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3answers
158 views

CAT3 and CAT5 in the same conduit. Cross-talk potential?

Can I run telephone cables and standard UTP CAT5/6 in the same conduit? Will it cause any interference or cross-talk?
1
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1answer
306 views

Aerial fiber to replace underground fiber optic cable

I have aerial fiber optic cable only. Can I use this cable underground because I have excess aerial cable but I have no underground cable? In short, is aerial fiber optic cable insulated enough to be ...
8
votes
4answers
20k views

The maximum length of CAT6 for intranet network?

Recently I purchased CAT6 cable with a length of 150 meter. I bought another CAT6 with a length of 148 meter. I joined both the cables using RJ45 cable coupler. I tested it using LAN TESTER, and ...
2
votes
1answer
3k views

What are the capacity and speed of a cable?

In my work, I come across with a cable with TB/s capacity and speed in GB/s. I did some search and found and article from Cisco trying to explain the two terminologies in terms of a water tap. The ...
1
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1answer
100 views

Network issue with IP cameras

The network consists of 7 UBNT G3 IP cameras a netgear 16 Gigabit port switch and a Windows 7 NVR that is running Blue Iris (I ran UniFi Video and Xprotect Essential with same results, so it is not ...
1
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1answer
1k views

Connecting two switches together over longer distance fails

I am working in a small business, but the office is quite large. For ages, everything ran over Wi-Fi here, but it's simply not reliable enough (Walls blocking signal, high latency, etc). Some days ...
3
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2answers
660 views

Cat6 FTP shielding

I received a edexcel patch panel for a cat6 ftp cable, I was puzzled by the diagram. It shows I should cut away the foil. I am used to pulling the foil back and placing it under the bar clamp. Is it ...
1
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2answers
864 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 ...
4
votes
1answer
896 views

Is the fact that cable internet access is a shared medium intrinsic to its HFC infrastructure?

I know that cable ISPs use HFC, while DSL uses classic twisted pair. Is the shared medium an intrinsic side effect of a coaxial cable? Couldn't you set up a twisted pair infrastructure to also be a ...
3
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2answers
10k 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 ...