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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.

2
votes
4answers
315 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
votes
2answers
161 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
vote
1answer
41 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 ...
0
votes
4answers
28 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 ...
0
votes
1answer
118 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 ...
-2
votes
1answer
29 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 ...
1
vote
2answers
71 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, ...
3
votes
3answers
107 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 ...
1
vote
2answers
87 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 ...
4
votes
2answers
68 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 ...
2
votes
2answers
107 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 ...
17
votes
6answers
3k 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.
4
votes
2answers
126 views

PoE losses: Cat5e vs Cat6

Just a simple physics question: per this link, Cat5e twist rate is lower than that of Cat6, and Cat6 cables are (on average) thinner. A higher twist rate means a longer copper wire per length of cable....
2
votes
1answer
94 views

Stacking Dell N3000 with and without stacking cable (distance)

First question here. I have a new scenario that I am not sure on how to achieve. I have a stack of two Dell N3024 switches (our core stack), that I need to add two more units to. However, these two ...
4
votes
1answer
78 views

40G QSFP+ to 4x10G SFP+ Cable

I need to buy a Direct attach 40G QSFP+ to 4x10G SFP+ Cable that may be used to connect two FPGA boards. I can find reasonably priced cables, however the cables are usually "branded". Is it important ...
1
vote
1answer
103 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 ...
0
votes
1answer
37 views

Unconnected cable in a switch

A cable plugged into a switch but unconnected on the other end, might lead to any problem in a "noisy" environment (industrial)? It's short, 50 cm, but there are motors, inverters, power supplies ...
0
votes
2answers
121 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?
1
vote
2answers
230 views

How to connect Cisco Catalyst 2960G using a RJ45 Console Port

Got a used Cisco Catalyst 2960G-24TC-L switch for studying networking and having a fundamental issue. As I new to networking, I'm trying to figure out what type of cable I need to use for connecting ...
0
votes
1answer
48 views

RJ45 console cable specs

I need longer RJ45 <-> RJ45 cables to connect my devices to a centralized management console. It's like 5 meters going go the next racks, at 9600 baud rate. Can I buy random/cheapest cable from ...
1
vote
3answers
168 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 ...
6
votes
4answers
739 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
votes
2answers
90 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
votes
1answer
150 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
votes
0answers
47 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
votes
2answers
141 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
vote
1answer
56 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
votes
1answer
57 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
votes
1answer
215 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 ...
1
vote
1answer
275 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
vote
3answers
73 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
votes
2answers
988 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
votes
1answer
53 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
171 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 ...
2
votes
2answers
58 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
votes
2answers
132 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 ...
1
vote
1answer
108 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
votes
1answer
517 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
vote
1answer
231 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 ...
54
votes
9answers
19k 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
vote
2answers
38 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
63 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
vote
4answers
102 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 ...
0
votes
0answers
53 views

Cat6 and Cat6a Patch Cords - Is UL 3992 Verification a Real Buying Factor?

I've seen some hype about UL's new verification for networking patch cords. Is this simply a solution to a problem that doesn't exist or is this something tangible to consider when buying patch cords?...
1
vote
1answer
38 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 ...
1
vote
1answer
43 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
vote
1answer
236 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
vote
2answers
50 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
585 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
vote
2answers
56 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 ...