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.
172
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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 ...
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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 ...
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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-...
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295
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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 ...
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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 ...
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218
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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 ...
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178
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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 ...
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475
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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; ...
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186
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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 ...
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298
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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 ...
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424
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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
...
- 149
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1
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75
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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 ...
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1
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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, ...
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129
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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+ ...
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427
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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 ...
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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 ...
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69
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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 ...
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3
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992
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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 ...
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1
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573
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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....
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207
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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 ...
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318
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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 ...
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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 ...
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831
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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, ...
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843
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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 ...
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106
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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 ...
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1
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82
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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 ...
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2
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141
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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 ...
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1k
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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 ...
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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 ...
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400
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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 ...
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607
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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, ...
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221
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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 ...
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3k
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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?
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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 ...
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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 ...
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2
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422
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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 ...
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6
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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.
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395
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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 ...
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2
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129
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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, ...
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106
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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 ...
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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 ...
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116
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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 ...
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3k
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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 ...
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3
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325
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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 ...
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176
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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 ...
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2
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2k
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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 ...
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135
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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 ...
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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 ...
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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 ...
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127
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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 ...
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