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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UTP 6A cable with FTP 6A connector

Can I use cat. 6A FTP connector with cat. 6A UTP cable? I've already bought UTP cable but i cannot find 6A UTP connectors, only FTP. Will it work or will it generate some interferences?
Wilchelmus's user avatar
0 votes
3 answers
124 views

same rack connection: better RJ45 or SFP?

For a connection between two devices on the same rack: Is there any notable difference or advantage between using 1Gb SFPs and using Gb Ethernet ports? (making a bonding/etherchannel). I know for ...
lyskiddie's user avatar
0 votes
2 answers
153 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
  • 3
0 votes
0 answers
32 views

Do I need direct-burial rated CAT5e for exterior wall contact?

I need to make some CAT5e cable runs (50-100') along the top edge of an exterior brick fence. Even though it's not buried, it'll probably be in frequent long contact with stuff that hangs out in the ...
Jason C's user avatar
  • 148
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
1 vote
1 answer
897 views

Max cable length when using 10GBASE-T SFP+ transceiver

I find it typically said that the maximum Cat6a cable distance is 100m for 10GBASE-T. But often for a 10GBASE-T SFP+ transceiver, the product is said to support a maximum of 30m. For example: Cisco ...
Syncopated's user avatar
3 votes
2 answers
1k views

Are LC-UPC connectors compatible with LC-PC?

I’ve come across various articles online that explain the differences between APC and UPC, where the former has an angled polish and the latter is a straight “cut”. Some of them explain that UPC and ...
comfreak's user avatar
  • 147
2 votes
2 answers
304 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
  • 223
1 vote
2 answers
321 views

Certified 0,15m CAT6a cable - what to expect?

We are thinking of patching our new network rack using 0,15m cables due to costs and cable management requirements. There will be around 400-500 connections using this cable length and we will be ...
Albin's user avatar
  • 173
0 votes
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
  • 101
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1 answer
582 views

Creating a distributed ethernet using a single mode fiber ring

Can I create a distributed ethernet using just 1 x core of a single mode fiber ring ? Update (Sep 2022): The following is what we've implemented and works great. It's one of the options discussed in ...
hmedia1's user avatar
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1 vote
1 answer
624 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
  • 113
0 votes
1 answer
850 views

According to appropriate standards, which Ethernet cable jacket colours should I use? [closed]

We have the following connections. User desks to patch panel to non-PoE switch CCTV to patch panel to PoE switch WiFi access point to Patch panel to PoE switch Floodlight to Patch panel to PoE switch ...
James Geddes's user avatar
0 votes
1 answer
83 views

Problems with cat 6 cable

Our company have all the networking with cat 5 cables. My problem is: one of our employees bought a cat 6 cable but we don't have any rj 45 for this cable, we only have for the cat 5. I tried so many ...
Rui Barbosa's user avatar
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1 answer
34 views

Why do higher speed links require a stronger signal?

I understand that higher-speed optical links require a stronger signal. For example, 16 Gbps Fibre Channel transceivers have to transmit at -1.3 dBm and receive at -10.3 dBm. If it falls below that, ...
user1177071's user avatar
2 votes
2 answers
133 views

LC dual pair converter to 10GBASE-T

If using dual pair LC fiber to run 10GbE over a long distance, what's the best way to connect it to a server on one end which has a 10GBASE-T port? On the other end there's a switch with 10G SFP+ ...
g491's user avatar
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0 votes
1 answer
633 views

Max. patch cable length to connect two switches?

I tried to research this, but cound't find a specific answer to my scenario. So I tried to understand the necessary background knowledge myself, hopefully I came to the right conclusion. If I want to ...
Albin's user avatar
  • 173
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
  • 173
1 vote
1 answer
87 views

Which type of ethernet cable for external runs to cameras and home office? [closed]

I'm sure this question has been asked a hundred different ways, but I've been struggling to piece the various bits of information together and finding quite a lot of misinformation about ethernet ...
Tim's user avatar
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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
  • 123
2 votes
1 answer
770 views

PoE-safe Cable Tester

We use a lot of midspan PoE injectors here, rather than PoE switching1, and I recently burned out my third cable tester in the last 2 years by accidentally plugging into a line with an active injector....
Joel Coehoorn's user avatar
1 vote
1 answer
239 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
0 votes
1 answer
453 views

Uses of Rollover Cable

Whilst looking into rollover cabling, I stumbled across this page - https://www.computercablestore.com/straight-through-crossover-and-rollover-wiring - which claims that: Rollover cables are not ...
Ryan Walter's user avatar
0 votes
1 answer
2k views

Crossover Cabling - Reversing TX and RX Signals [duplicate]

It is often said that crossover cables 'reverse the transmit and receive signals' compared to straight through cables. However I am yet to see an actual explanation of why the reversal of signals is ...
Ryan Walter's user avatar
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
2 votes
2 answers
1k views

Will OM4 Fiber Work with my 1GbE Fiber Transceiver?

What is the fastest cabling that can be used to connect the transceiver that Meraki calls the 1GbE SFP SX Fiber Transceiver? Source: meraki.cisco.com/products/switches/accessories I'm trying to ...
Lonnie Best's user avatar
3 votes
0 answers
111 views

What is the real standard behind the "Rule of 6" for running network cabling next to power? [closed]

Something I picked up years ago at a previous employer is the "Rule of 6": When running data lines in parallel with power for a distance of at least six feet, the data should be at least six inches ...
Joel Coehoorn's user avatar
2 votes
1 answer
89 views

Reliable transfer but unreliable auto-negotiation?

I have two servers, the first with a built-in and add-on 10gbit port, and the second with built-in gbit and add-on 10gbit (Syba AQC107), communicating through a feed-through rated for gigabit ...
G. Hall's user avatar
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2 votes
2 answers
169 views

Advice on Patch Panels

We are thinking of getting a switch for our data center that blows air from the ports to the power plugs. However, we use a hot-aisle and cold-aisle layout. Our other switches blow in the opposite ...
user1177071's user avatar
2 votes
2 answers
1k views

How to extend CAT6 ethernet 2m from ceiling down to server rack?

Previously, we had a 6RU comms cabinet near the ceiling. We've now replaced this with a full-depth server rack sitting on the ground. The plan was to remove the old patch panel, and punch it down ...
victorhooi's user avatar
1 vote
2 answers
4k views

Confused about the results from the cable tester

A little bit of backstory, just in case you want some context. In the last couple of weeks the network at least internally has slowed down. As far as I can tell the only things that have changed has ...
Eddy's user avatar
  • 13
1 vote
2 answers
418 views

Cat6A Junction Boxes in the US

I'm looking around the internet and can't seem to find a Cat6A junction box available in the US. Is there a reason they aren't sold in the US? Basically, I have a Cat6A cable that is run to the wrong ...
searchengine27's user avatar
0 votes
1 answer
679 views

Cat 6 life expectancy [closed]

how long will cat 6 cable survive outside if it is not an external grade cable. No sunlight touches the cable but only cold temperatures of around -10c, everyday every year. the cable has no holes, ...
Chris.A's user avatar
  • 13
4 votes
2 answers
275 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 ...
bodgit's user avatar
  • 143
10 votes
2 answers
3k 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?
nufuniliza's user avatar
1 vote
2 answers
198 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 ...
Serguei's user avatar
  • 113
5 votes
2 answers
7k 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, 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 the two ...
HussainBiedouh's user avatar
1 vote
2 answers
456 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 ...
Robbie Dee's user avatar
21 votes
6 answers
10k 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.
oppsig's user avatar
  • 313
2 votes
1 answer
450 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 ...
Alister Hill's user avatar
2 votes
2 answers
130 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, ...
Malaxes's user avatar
  • 43
1 vote
1 answer
111 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 ...
Tommy Andersen's user avatar
0 votes
1 answer
93 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 ...
Bali Vinayak's user avatar
1 vote
1 answer
121 views

Can bad cabling affect the overall network?

TLDR: Can a handful of problematic lines negatively impact the performance of the network as a whole? ... or would any problems stop once it reaches the switch? Longer Version (background): A ...
DHW's user avatar
  • 113
3 votes
1 answer
3k 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 ...
Joshuan's user avatar
  • 41
1 vote
3 answers
349 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 ...
pol6880's user avatar
  • 11
-1 votes
1 answer
181 views

How is this Patch Panel even working [closed]

I recently took a Jr. Developer position at a small company. I've been asked to solve a network issue at one of our remote warehouses (I'm the interim IT / Network guy). I did a little bit of Panduit ...
nulltron's user avatar
  • 101
4 votes
2 answers
2k 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 ...
Argyll's user avatar
  • 173
3 votes
2 answers
154 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 ...
Asagohan's user avatar
  • 135
3 votes
1 answer
3k views

Best Practice for Connecting 3 Switches to Router

I am wondering the best way to connect 3 switches to a router in a server rack. The router is a Cisco RV320 (Dual Gigabit with two static IPs) There is three 48-port Ubiquiti EdgeSwitches, A Datto ...
coopwatts's user avatar
  • 173