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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3answers
147 views

Gigabit NIC stuck on 100mbs

My main problem started when i installed 4 gigabit NIC into my computer. The 4 NIC are connected to GB linksys switches, each in different location,1 of the 4 gives GB and the others are stuck on 100 ...
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1answer
716 views

How does an ISP keep track of who has which IP address? [closed]

If an ISP sets up cable modems in bridge mode and lets users change the mac address on their internal router (or completely change routers), which then assigns a new IP address, how can the ISP track ...
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1answer
1k views

NEXT Crosstalk calculation

The NEXT value for a given cable type is generally expressed in decibels per feet or decibels per 1000 feet. NEXT value varies with the frequency of transmission. The higher the NEXT value, the ...
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2answers
666 views

What type of enclosure can be used for non-plenum electronics in a plenum space?

Is there a legal way that complies with the USA-NFPA fire code, to put regular non-plenum network devices above a drop ceiling in a plenum airspace? Background: In many places in the United States, ...
4
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3answers
943 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 ...
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2answers
223 views

When is the connector's damage a good reason for a new pigtail welding?

I have recently seen a few pictures of optical fibre connectors taken by a microscope after those connectors had been cleaned. The picture states, that the connector fails IEC 61300-3-35 norm. Like ...
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2answers
2k views

In Fiber Optic Telephone line, how light signals are converted to the voice signals? [closed]

I have been learning how internet data travels in different kind of Broadband access. In case of telephone broadband, voice signals travels through the telephone line. At the user premise, the modem ...
5
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1answer
158 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 ...
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1answer
46 views

Category-6 cable for CCTV [closed]

T568A or T568B? Which one (1, 2, or 3)? Straight-through Cross-Over Roll-Over
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3answers
9k views

How do I build a USB-to-rollover RJ45 Cisco console cable?

I haven't found a guide on the web and am wondering if anyone can point me to a how-to or show me the steps. Basically, I'd like to craft something like this: http://www.amazon.com/CableRack-Rollover-...
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3answers
3k views

Running Cat 7 STP cables in the same cable trays as 3-phase power cables

I am doing some work in a factory that is quite new, and have been asked to terminate some network cables - simple enough. However on looking up at the cable trays, which are suspended from the ...
2
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2answers
368 views

What can I do with a crossover ethernet cable?

Is the file sharing of two PCs, connected with a crossover cable, both directions or only one? Would I be able to connect to a PC and play LAN games over this mini-network? Would this be extremely ...
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1answer
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 ...
5
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4answers
35k views

CAT7 Ethernet cable: order of wires in the clamp

On a CAT 7 Ethernet cable each twisted pair is individually shielded, and all pairs together are inside a shielded jacket: Colors of the wires may change, for instance I recently got my hands on a ...
4
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2answers
183 views

ELI5 – basic questions regarding MMF

We have a few fiber optic connections between our buildings, and admittedly we haven't a bloody clue about them (other than "all buildings have SMF, except one that has MMF because reasons, and we're ...
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2answers
133 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 ...
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1answer
368 views

how to make two workstations communicate using straight through cable

Two different workstations are connected with straight through cable. Attempts to ping between hosts are unsuccessful.what should be done to make them communicate?
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1answer
40 views

Bond ADSL+ line with Cable Modem line in one single router

I need two bond ADSL+ modem with cable modem router at the office so I don't have to switch the line everytime one of them is offline, is there any software/hardware that allows me to bond two ...
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3answers
3k views

Cabling standard for Layer-3 switch

I want to know the appropriate cable type between: Layer-2 and Layer-3 switch Layer-3 switch and router Is it cross-over or straight through?
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1answer
80 views

DSL upload link breaks down. Where to look and not to look?

In a small office where I set up the network, we recently started to experience WAN problems on the (V)DSL line. Specifically, up to three times per day the upload link breaks down to almost zero ...
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2answers
873 views

How to tell if a Cable is Crossover or Straight from one end

So I have an ethernet cable but I can see only one end of it. From the colors this end is Straight. The other end is connected to a router or switch (I don't know where it's connected because it goes ...
1
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1answer
489 views

Static Multicast MAC address term

Is the Static Multicast MAC address term the same as hardware ethernet MAC address (wan0)? In devices where two MAC addresses is present, i.e. lan0, wan0.
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3answers
5k views

Does Internet speed over cable depend on distance?

Perhaps the question I want to ask is not directly related to discussion subjects over here, but I couldn't find better place to ask. I wanna know how does internet connection speed depend on ...
5
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1answer
4k views

What is the minimum diameter for Power over Ethernet?

There are different PoE standards like 802.3af, 802.3at (PoE+) and 802.3bt (announced for 2017). In some articles I found the information that "CAT5e" is the minimum requirment for 802.3at. But "CAT5e"...
1
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1answer
286 views

Doubt about MMF and SMF speed

I have a doubt about MMF and SMF cables. If MMF can handle more than one signal light at the same time and both MMF and SMF support full-duplex, why isn't MMF faster than SMF cable?
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1answer
148 views

T-568A/B on the same cable

I'm helping my friend punch down all of the Cat5-e cable in his office. Some of it went to existing patch panel and some went directly into a switch. There are two patch panels, each was about half ...
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1answer
125 views

Should using full bandwidth cause packet loss and latency (domestic cable service)?

I'm noticing large spikes of packet loss when using maximum of my 30/1 HFC cable connection. Is that normal, or should I talk to my ISP? E.g. when downloading something at close to 30mbps or ...
4
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1answer
5k views

Any problems mixing T568B Patch cords with T568A Premise wiring?

I'm going to be running some Cat5E cables to have a more organized wired computer network at home. I'm going to be terminating the premise wiring at the jacks and patch panels based on the T568A ...
2
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1answer
2k views

Do flat ethernet cables perform as well as regular cables?

I came across some flat ethernet cables (like this) and was thinking of picking some up, but I have no idea if their performance would be degraded compared to regular cables. Does anyone know ...
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2answers
209 views

I need the functionality of a pair of patch panels but I don't want to run one cable per port

My needs will be met by two patch panels with dedicated copper running between them for each port. But I'm looking at a few hundred ports and I'd rather not have to run a few hundred cables. ...
2
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2answers
2k views

Can a UTP cable use CSMA/CD?

I know that coaxial cable can use CSMA/CD but can UTP used it also? and can you guys explain it how is it done or work? thank you so much for your answer
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1answer
67 views

How many 3 dB couplers are needed to construct a 16 way fiber optic splitter?

Wikipedia says we need 31 couplers. Can't we do it with 8 couplers?
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1answer
1k views

twisted pair vs single ended usb

I would like to understand what is the difference between twisted pair and single ended USB with the other hand having an ethernet port. My colleague mentioned that both ends have to be ethernet for ...
2
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1answer
896 views

Fiber Optic vs. Cable from ISP - how to compare speed?

My business is moving to a new location and this calls for new internet service. I am comparing quotes for both fiber optic and coax services from local internet service providers. While researching, ...
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1answer
6k views

Two computers connected by straight through Ethernet cable, communicating with APIPA addresses

Good day, I connected two computers together with an Ethernet straight-through cable. I did not configure any ip address, and after a while they both got APIPA addresses. Now they can ping each other ...
5
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1answer
526 views

Is it acceptable to run Cat 6 along the top of lighting trunking?

In our factory, we have lighting trunking running above the factory floor, which contains electrical cables and has fluorescent lights hung off the underside. It goes everywhere and could potentially ...
3
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1answer
210 views

OM3 optical fiber 850 nm compatibility with 10GBASE-LRM

I have Cisco equipement with "XENPAK-10GB-LRM" and Optical Fiber Type OM3 wavelength 850 nm. As the LRM interface works at 1310 nm, will it work with this type of Fiber.
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1answer
145 views

Internal MAC addresses visible

Had a conversation with a co-worker that left me scratching my head. Searching the Intrawebz was fruitless in finding an answer. Anyway my coworker was having some speed issues and was working with ...
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5answers
4k views

Ethernet cable used two ways

We have 8-wired ethernet cable in the wall and wall socket for two ethernet cables. I am facing the decision how to connect the wires. I know about two basic possibilities: I can use the cable as ...
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3answers
197 views

How do cable internet providers limit user bandwith?

How cable internet providers limit their bandwith? Are they using SFTP service? If yes, how does all that work?
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1answer
109 views

Using home phone cabling as home network [closed]

I've just moved into a new build apartment. Each room has a female telephone port (431A?), connected to a female telephone port in my electricity cupboard. My BT telephone line then comes into the ...
5
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3answers
10k views

How is it possible to run VoIP on CAT3. Do you not need CAT5 for the voice data?

So I never knew this till today but I thought you needed CAT5 for VoIP but this business is running VoIP on CAT3. Don't you need the extra wires for the voice, data and power?
8
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3answers
6k views

1000Base-T Ethernet limited to 100 m, why?

In 1000Base-T Ethernet connection, why is there a 100 m link length limit? CSMA/CD links normally are limited to a few hundred meters because of the limitations that CSMA/CD implies (collision domain ...
2
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3answers
11k views

How to create Ethernet cables when I cannot figure out color of cat 5e cable wires?

I'm learning how to make my own Ethernet cables (to get deep understanding of Cisco for their exams), but the cables I am getting have small wires whose colors I cannot distinguish. A person in my ...
2
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1answer
2k views

how to check the speed between 2 switch hub

I have 2 gigabit switch hub both have Green(for 1000 mbps) and Orange(for 100 mbps) indicator lights at each port. the distance between two gigabit switch hub is 100 meters. I use CAT5E outdoor cable. ...
2
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3answers
2k views

Is the bandwidth of cable constrained by its length?

If a certain cable has a bandwidth of 10 mbps, that means in can contain 10 megabytes of data inside it at any given second. However, does this assume some standard length? The analogy I've been ...
2
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2answers
589 views

Only 100Base-TX full-duplex over a 25m CAT 5e cable

I have a 25m CAT 5e cable and I'm trying to connect to a router. The connection obtained is always 100Base-TX full-duplex, it never reaches 1000Base-T. What can be the problem? As long as it says it's ...
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2answers
118 views

Cat6 compatability

Will a Cat6 ethernet cable work on a router/NIC that only supports cat5 speeds? I know that it won't give me cat6 speeds but will it even work in the first place?
4
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3answers
782 views

An easy yet effective way to test if existing network cabling will be ok for GbE?

OK, so the story is this: I'm a school governor for my daughter's primary school here in the UK (roughly equivalent to being 'on the school board' in the USA, I think). I'm the IT governor (pretty ...
3
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1answer
379 views

Why Do RJ45 jacks/plugs require multiple incoming and outgoing wires to work?

I Hope I'm at the right place. I am trying to figure out why RJ45 jacks and plugs require 2 incoming wires and 2 outgoing wires to work. Why is just 1 incoming and 1 outgoing not enough? IS there a ...