Questions tagged [cabling]

For questions about network cable installations used in a physical building or as used in a computer network topology. This tag is suitable when your question is about network cable installations, that are used in buildings to distribution frames and data centers or long distance cabling that is buried into the ground.

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85
votes
21answers
77k views

When to choose fiber instead of twisted pair (copper)

These days both fibre and twisted pair are supporting 1000BASE-T and 10GBASE-T, but when do you choose one over the other? The obvious one is maximum cable length, but what are other factors which ...
56
votes
14answers
195k views

Multi-Mode and Single-Mode Fiber Differences

When cabling a network using fibre, what is the difference between single-mode and multi-mode fibre? When should I be using one or the other? Are there compatibility and/or speed concerns with either?
21
votes
6answers
6k 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.
20
votes
5answers
13k views

Speed of Light in Copper VS Fiber - Why is Fiber Better?

I'm reading Computer Networks - A Systems Approach 5th ed., and I came across the following statistics for the speed of light through different mediums: Copper – 2.3 × 108 m/s Fiber – 2.0 × 108 m/s ...
20
votes
5answers
98k views

Cable Colors and Purpose

I've been doing some work with some big businesses and so far I've learned yellow is internet and blue is phone. Is this a standard or is this just a personal chose? Do colors mean different tasks?
20
votes
7answers
63k views

Minimum Ethernet Cable Length?

I have heard from a few people that cables less than 1 meter are prone to transmission problems. Is there any minimum copper cabling length? Please explain if this is true or not and share any ...
20
votes
5answers
40k views

Where to cross RX/TX line in fibre optical cabling

I'm in the process of connecting together some sites via optical fibre. The trans-site multimode fibres are terminated with SC jacks on patch panels from where they are patched to the corresponding ...
13
votes
2answers
11k views

10GBase-T vs. SFP+ Direct Attach

What are the advantages and disadvantages of using 10GBase-T vs. SFP+ Direct Attach to interconnect devices where distance is not a determining factor?
12
votes
2answers
19k views

Shielded Twisted Pair (STP) termination and grounding

I have knowledge terminating CAT5 UTP. But, for an installation in a remote office, the cable will be routed near a power source which we already know causes a substantial amount of 'noise' on ...
11
votes
4answers
9k views

What's the point of auto-sensing 10/100 Mbit/s Ethernet?

According to the notes I'm reading: 10/100 Mbit/s Ethernet refers to the standard that can autosense which speed it needs to run between speeds of 10 Mbit/s or 100 Mbit/s. Why would autosensing be ...
10
votes
2answers
2k views

Does bridging add delay?

If I use a bridge to perform traffic sniffing like man in the middle will the bridge add a delay? And what word should I use delay or latency?
9
votes
3answers
6k views

Why one of the pairs on Ethernet is not adjacent?

I know that Ethernet over twisted pairs have two standards as the figure below: The pairs are twisted to avoid cross-talk. But why in both standards there is one pair that is not adjacent (pin 3 ...
9
votes
2answers
777 views

Multi-drop Cat5e/6 Cable?

I'm looking to install ethernet ports in a small business. There are 7-8 groups of cubicles each with 4 desks. Ideally I'd like to run a cable to each desk but if my math is correct I'm looking at ...
8
votes
4answers
22k 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 ...
8
votes
1answer
2k views

Internet Cable Has Been cut in two and taped back together

Let me explain, we have a two analogue lines (something like 16 pair each, the standard cable that's put into buildings) that come into our building but they pass through the building next door. ...
8
votes
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 ...
8
votes
4answers
293 views

Is ethernet a term describing just the protocol or the interfaces also?

Is ethernet describing the protocol and therefore cat5 cables became labelled ethernet cables because they are used for this protocol?
7
votes
3answers
652 views

Determine Core Size of Fiber Run

We have an existing fiber infrastructure that's several years old. I can't for the life of me read the jacket to get the core size of the fiber, and was wondering if there was a way to measure it ...
7
votes
2answers
992 views

Do low temperatures cause problems installing new optical wiring or fixing broken optical cables by splicing?

One of our supplier reported big problems splicing (using this) a broken outdoor optical fiber cable when temperatures around or little bellow freezing point. They refuse to install new optical fiber ...
7
votes
1answer
1k views

Is there a good way to standardize on an RS232 over RJ45 pinout that is used for connecting to network device console ports?

These best practices espouse having a dedicated physical console connection to network equipment for management. Assuming your device is within RS232 range of your management workstation, this would ...
6
votes
3answers
2k views

Ethernet Cable Orientation

I'm in an A+ course and was just working on wiring Ethernet cables. I was wondering, will an Ethernet cable function if the wires are reversed? Say instead of wiring 568B like striped orange, orange, ...
6
votes
5answers
8k views

What are leased lines, serial lines and dedicated lines?

I hear the terms leased line and dedicated line and want to know what the difference is. For example, is DSL considered a lease line? or is T1 considered a lease line? I hear all these terms being ...
6
votes
2answers
540 views

How to properly name TIA-606-B Cabling Subsystem 1 far end identifier for work area equipment outlets?

We are moving to TIA-606-B for labeling. I have read most of the TIA-606-B standard. Some parts I have only skimmed, while others I have studied in depth. I do not understand the rationale behind the ...
5
votes
1answer
12k views

How to repair a break in a long Cat-5e cable run

I have a long run of Cat5e which is broken at about 20' from one end. Replacing the entire cable isn't an option, as it's fairly long and is going through walls and such. Searching this on google ...
5
votes
3answers
6k views

Can normal CAT6 be buried? [closed]

I have the leftover from a long spool of CAT6. I'd like to run a line to my garage, which is separate from the house. Can "typical" CAT6 be directly buried, or should I buy one of the "waterproof" ...
5
votes
3answers
321 views

Where are UTP cable speeds defined for Ethernet?

I have consulted several Network+ exam preparation books, Network+ practice exam questions, the IEEE 802.3-2015 standard, and several older TIA-568 standards. However, I'm having trouble finding a ...
5
votes
1answer
606 views

Long Reach Ethernet

In our corporate headquarters we are looking at replacing a 20+ year old phone system and making the switch to VoIP. This is a high rise where we have some limits around options for cabling. ...
5
votes
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 ...
5
votes
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"...
5
votes
1answer
366 views

Is there an IEEE recognized method for splicing Category 5e or 6 cabling?

Is there an IEEE recognized method for splicing Category 5e or 6 cabling, and maintaining the expected data rates? Such as the junction box shown in the link below. https://www.lowvoltagecables.com/...
5
votes
1answer
6k views

UDLD state: tx/rx loop detected

Relevant Log messages Feb 1 03:39:08.338 EST: %IPV6-4-DUPLICATE: Duplicate address FE80::212:44FF:FE4D:4400 on GigabitEthernet8/20 Feb 1 03:39:08.904 EST: %UDLD-SP-4-UDLD_PORT_DISABLED: UDLD ...
5
votes
1answer
533 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 ...
5
votes
1answer
160 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 ...
5
votes
2answers
501 views

Where should I start when it comes to organizing my switches? [closed]

I inherited a bit of a mess. And I'm not all that experienced with cabling, so I was hoping to get some advice on where to start when it comes to organizing things. In the image, patch panels are ...
4
votes
7answers
985 views

Media Transfer rates......is using laser over fiber the fastest?

My simple understanding is that one of the advantages of going to fibre (light) is that you transfer things at a lot higher rate than a standard cable using the light frequency. Adjusting the light ...
4
votes
3answers
786 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 ...
4
votes
3answers
5k views

Mixing OM-2 with OM-3/4 Patchcords/Installation Fibers

is it possible to mix OM-2 with OM-3/4 Patchcords or installed Fiber. As far as i know, they are the same diameter of 50µm, they only have different bandwith caracteristics. Is there any other reason ...
4
votes
2answers
184 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. ...
4
votes
2answers
200 views

Connecting 2 FCoE Switches together with optical cable

I'm designing a network and have 2 cabinets on each floor, and I'm thinking of using FCoE switches in both cabinets so that I can connect them with fibreoptic cable. I think I can easily find switches ...
4
votes
2answers
187 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 ...
4
votes
2answers
185 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 ...
4
votes
5answers
16k views

Is there a difference between using a cat 6 wall jack vs using a female-to-female connector?

I am running new cat 6 cable from my router to my office so I can get my computer hardwired instead of using WiFi. When looking at what I need to get to connect the cable to a wall plate, I'm seeing 2 ...
4
votes
3answers
1k 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 ...
4
votes
2answers
12k 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 ...
4
votes
3answers
720 views

Direct-burial cable: fiber vs cat-5e/ cat6

Apologies if this isn't the right place for this question. I'm converting an out-building to a home office. The structure is approximately 175 feet from the house. We're digging a trench for a 240V ...
4
votes
1answer
8k views

What is the correct way to diagram a Patch Panel?

I am creating a network diagram for my local LAN. I would like to include a patch panel diagramming what physical location (office) each port goes to, as well as the devices in that office. I have ...
4
votes
1answer
5k views

What is the difference between RJ45 connection standards WE/SS and TE-AMP and when and where are they used?

I recently decided to run some CAT6 cabling and wanted to ensure that my Crimpmaster RJ45 die would work fine for the CAT6A shielded connectors. I noticed that several people had trouble using the ...
4
votes
1answer
636 views

Patch cable wiring/colors

I cut a cat5e patch cable to put a female end on the cable, but the colors for the male piece are: orange, orange/white, blue, blue/white, green, green/white, brown, brown/white. The patch cable ...
4
votes
1answer
5k views

CAT6 cable AWG23 seems too thick for plugs [closed]

I have 500 feet of what is described as Cat6 Solid STP Copper Bulk Cable (White) Here are the full specs CAT6 STP 8-Conductor, Bulk, PVC Jacket, (FTP) Shiedled AWG23, Solid-Bare Copper,(UL/ETL) ...
4
votes
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 ...