Telegärtner Blog

Circular connectors are proving their worth in a huge variety of different applications like industrial communication, automation, robotics, physical…

Common mode return loss (CMRL) is the ratio of an unwanted common mode signal to its part that is reflected to the transmitter. Read on to find out…

Every now and again one reads about RJ45 modules for 25 Gigabit Ethernet. The frequency range is said to be 1 MHz up to 1250 MHz. However, the…

Corporate IT networks should be designed to manage interruptions. The last issue introduced redundant cabling in the riser. This issue focuses on…

Singlemode fibers offer highest data rates and link lengths of several kilometers. Inside of buildings, multimode fibers are preferred. Can the two…

Certificates of independent test labs regularly proof the high quality of Telegärtner products. They can be found in the product description in the…

Does the cabling for 25 Gigabit Ethernet have to transmit only frequencies up to 1250 MHz? Can category 6A outlets be used for 25 Gigabit Ethernet in…

Meter cabinets in the electrical infrastructure must increasingly be equipped with IT cabling for the use of intelligent electricity meters (smart…

Return loss is the ratio of the original signal strength to its part that is reflected to the transmitter. Read on to find out more.

Corporate IT networks should be designed to manage interruptions. The last issue introduced redundant cabling between distributors on the same network…

More and more homes are connected to the internet using an optical fiber. This is where one comes across the terms FTTH and FITH. What’s the…

Sometimes the total of 10 meters patch cord the cabling standards recognize are not enough. Longer patch cords are recognized by the standards when…

The fibre optic connection is finally coming into the home, bringing high data rates of 50 Mbit/s, 100 Mbit/s or more to every home. However, the…

Insertion loss is a measure of the loss of signal strength along the link. Read on to find out more.

The cabling standards specify not only distributors, they also specify the spaces that hold them. Read on to find out more.

Corporate IT networks should be designed to manage interruptions. However it may well happen that a cable gets damaged. When redundant cables are…

Are keystone modules standardizes? Do modules of one manufacturer fit into the module carriers of another manufacturer?

The data cable does not always enter the outlet from the right direction. Angled RJ45 modules with variable cable entry easily adapt to the direction…

Industry 4.0, Smart Factory, the Internet of Things, Internet of Everything – there is no shortage of buzzwords when it comes to the concept for…

Impedance is the AC resistance of the link. Unlike DC resistance, impedance is a frequency-dependant parameter. Read on to find out more.

The cabling standards specify cabling and connecting hardware. But they also specify distributors. Read on to find out more.

More connections in less space has become a trend in fiber optic cabling as well. MDC, SN and CS are three compact connectors that have the potential…

What is UPC polishing and what’s the difference between UPC and PC or APC polishing?

Category 6A RJ45 modules can transmit up to 10 Gigabits per second. However the amount of data that has to be transmitted rises continually. Cat. 6A…

DC resistance unbalance between pairs is a measure how much the DC resistance of one wire pair differs from the resistance of another pair which is…

Optical fibers allow higher data rates and longer link lenghts than copper cables. Fiber optic cabling that runs up to the workplace is recognized by…

Fiber optic cabling up to the workspace offers high data rates and long link lengths. In many projects floor distributors can be omitted. Terminal…

Is there a uniform APC polishing angle?

The law to restart the digitalisation of the energy transition stipulates the use of smart metering systems and the associated deadlines in Germany,…

DC resistance unbalance within a pair is a measure how much the DC resistance of one wire differs from the resistance of the other wire within the…

Often unloved but useful: Management and documentation of IT cabling can be more important than one might think. The standards provide guidance for…

Data can be transmitted as common mode or differential mode signals. Read on to find out what that means and why differential mode signals are so much…

What are hex adapters and what’s the difference between duplex, quad and hex?

Staggered wires can be inserted much easier and quicker into the wire manager. This saves a lot of time.

The terms “DTE” and “DCE” come from the very beginning of IT networks but they are still present today. Read on to find out what the terms stand for.

Many IT projects are on a tight schedule. Clever ways of terminating the wires save time. The old proverb “small cause, big effect” proves true. When…

Fire protection in buildings is important. Slow-burning products give people more time to leave the building and thus protect human lives. There is…

DC loop resistance is the resistance of a wire pair. It is one of several parameters which are important for remotely powering devices via Power over…

What is UPC polishing and what’s the difference between UPC and PC or APC polishing?

End-to-end connection links enable efficient cabling without junction boxes and patch cables. DIN EN 50173-20 specifies three different types of link?…

More and more devices and components in modern buildings are powered over the data cable, eliminating the need for an electrical socket. Investors and…

The wires of the four pairs in a data cable have different twists which results in different overall lengths. Because of this, the signals travelling…

IT cabling standards also specify environmental conditions and IP and IK ratings. Read on to find out more.

PoE, PoE+, PoE++, 4PPoE … read on to find out which PoE versions are recognized by the standard.

Some RJ45 jacks also accept RJ12 and RJ11 plugs and some don’t. What’s the difference between the three plugs and what happens when the wrong one is…

The usual IT outlets typically are double outlets with to RJ45 jacks. Installers who prefer to pull only one cable to each outlet prefer duplex copper…

Wherever telecommunication outlets and patch cords are unwanted for security or aesthetic reasons or where there is simply not enough room for them,…

Standards usually refer to other standards. This is particularly important when a standard requires compliance with another standard. But where does…

A/I-DQ(ZN)BH 12G50/125, I-VHH 2E9/125 – you can find such and similar codes printed on the jacket of fiber optic cables. Read on to find out what the…

Propagation delay is a measure how long a signal takes to travel from one end to another. This is important because the IEEE 802.3 standard specifies…

Twisted-pair cables are terminated either according to T568A or T568B. May they be connected even tough they have different pin/pair assignments?

Which Telegärtner RJ45 module and which RJ45 outlet is compatible with the faceplates and module carriers of other vendors? There are comprehensive…

What’s the difference between fiber optic connector grades specified by IEC 61753-1 and GHMT PVP Level 2?

Indoor copper cables shall not become wet. However it can happen that a cable drum accidentially stands in the rain or cables get wet by accident…

EN 50173-20 recognizes various types of end-to-end links as “alternative cabling configurations“.

Legth testing of a link serves two purposes: To make sure the length of the cable does not exceed the limits specified by the standards and to use the…

No other parameter is discussed that often as NVP as plays as it is important for testing the correct length of a link and thus for billing the…

IT connectors that are desingned for indoor use must not be used in outdoor applications. This includes IP67 rated industrial connectors. This white…

Gone are the times when installing fiber optic connectors on a cable was for specialists only. Modern field-installable connectors can be installed on…

 May outdoor cables be installed inside of buildings? What is written in the standards?

Many RJ45 modules have their component category like “Cat.6A“ printed on the front. Why are they installed with the printing upside down in sloped…

Good fiber optic connectors have low attenuation and high return loss. But what exactly is “good“? IEC 61753-1 specifies performance grades for fiber…

With Single Pair Ethernet, Ethernet becomes the uniform communication protocol on all levels of industrial automation and building automation. Some…

Half of the eight wires in a cable have a white insulation. Happens from time to time that wires are swapped. This issue and the following ones will…

In the past days, a “new ISO/IEC 22237-5 standard for data centre cabling“ made network designers and installers unsure. However, there is nothing to…

There are two versions of IDC contacts around: 110 connect and LSA+. At first glace they resemble each other, but they differ in important details.…

It sometimes happens that wires slip out of IDC contacts although everything looked fine. This issue shows a simple and proven trick how to connect…

Patch cord have plugs on each end, channel test adapters have jacks. Should be a perfect fit, shouldn’t it? Unfortunately, it isn’t, as it gives you…

Patch panels, outlets and RJ45 modules typically have either LSA Plus or 110 contacts. Can the LSA Plus punchdown tool also be used for 110 contacts…

IEEE 802.3, 802.3at, bt, af, … IEEE numbers can be a bit confusing. In this article we focus on the numbers of the IEEE Standards for Ethernet.

The wire map test checks whether all wires of a cable are connected properly on both ends of the cable and whether there is a short or an open. The…

IDC and IPC contacts terminate the wires of a cable in a socket, module or plug. Read on to find out the difference between these two types of…

Particularly short field-installable RJ45 plugs and modules come in very handy in confined spaces. This very often happens in retrofit installations…

Telegärtner presents an innovation in the field of connection technology with the N connector in the Push & Crimp version. The Push & Crimp series is…

Wherever telecommunication outlets and patch cords are unwanted, electronic devices are connected to the horizontal cable. Modular plug terminated…

Sometimes the tester adds a star to the test results. Read on to find out what *Pass and *Fail mean and about their impact on validating a link.

Standards are important – and expensive. Few people know that some standards can be obtained or at least be read at no cost.

Optical fibers run parallel in a cross-over patch cord. Are they really parallel or are they somehow flipped?

Why would you buy a parellel presser when you already have a pipe wrench? The answer is easy: You are quality-conscious.

More and more homes and commercial buildings get a fast internet connection via optical fibers. But how shall the buidings be cabled in order to bring…

There are two versions of RJ45 outlets available: With modules that are snapped into a bezwo or a frame and with connecting blocks that are soldered…

Fiber optic patch cords with single-fiber connectors often have one connector with a red cable boot and another connector with a black one. What does…

The last issue of this column provided and overview on important global standards for IT cabling. This issue focuses on American standards.

In a test report there have to be the test results and the values specified by the standards. That’s a no-brainer. However, in a test report there has…

The white paper focuses on digital ceiling applications and on the IT infrastructures that go with them. Newsworthy!

There are standadized colours not only for optical fibers but also for the cables that hold them. The benefit of it: One can tell the fiber type…

Do copper cable have to be connected according to T568A or T568B? And why do the standards specify two wiring schemes? Read on to find the answer.

The last issue of this column provided and overview on important European standards for IT cabling. This issue focuses on global standards.

When it comes to testing, different cabling standards have different requirements what has to be tested. Read on to learn about the test parameters…

Wherever telecommunication outlets and patch cords are unwanted, electronic devices are connected to the horizontal cable. Modular plug terminated…

Wherever telecommunication outlets and patch cords are unwanted, electronic devices are connected to the horizontal cable. Modular plug terminated…

Classic structured cabling, fibre to the office (FTTO) or a passive optical LAN (POL)? This practical book gives professional installers, planners…

With a nearly countless amount of standards available, it is not always easy to keep things in perspective. Please find an overview of important…

Both, PoE and PoDL can power Ethernet devices over data cable. However, the two are not compatible at all

The white paper explains planning recommendations and product solutions for robust, future-proof and economic IT cabling in schools – straight-forward…

What is the difference between a verifyer, a qualifyer and a certifyer? Find out the difference and learn where to use which of them.

RJ45 connectors of category 8.1 do not meet the requirements of category 7 and 7A. Why?

Can old SC and new LC plugs be mated in the same adaptor like SC and ST?

Standards have to be obeyed, that’s what they are there for, aren’t they? Unfortunately, it’s not that easy. The correct answer like so often is: It…

IP67 rated industrial connectors are protected against ingress of dust and humidity. Outdoor applications, however, have some more and much harder…

EN 50173 and ISO/IEC 11801 recognize different link types. Read on to learn about the different types and how to test them.

A long piece of cable protruding the back box it easier to connect it to a flush-mount outlet, but it can’t be pushed back far enough after connecting…

Despite careful workmanship an error creeped into the cabling and the cable tester mercilessly reports FAIL. What now?

Retrofitting of IT outlets in homes is not an easy task. Comprehensive renovating or reconstructing allows milling wall slots and installing IT cables…

Twisted-pair, coax and fiber optic cables are used in many different applications, which makes different jacket materials necessary. Among the most…

Certificates of independent test labs regularly proof the high quality of Telegärtner products. They can be found in the product description in the…

Sometimes the total of 10 meters patch cord the cabling standards recognize are not enough. Longer patch cords are recognized by the standards when…

The data cable does not always enter the outlet from the right direction. Angled RJ45 modules with variable cable entry easily adapt to the direction…

Category 6A RJ45 modules can transmit up to 10 Gigabits per second. However the amount of data that has to be transmitted rises continually. Cat. 6A…

The law to restart the digitalisation of the energy transition stipulates the use of smart metering systems and the associated deadlines in Germany,…

Staggered wires can be inserted much easier and quicker into the wire manager. This saves a lot of time.

Many IT projects are on a tight schedule. Clever ways of terminating the wires save time. The old proverb “small cause, big effect” proves true. When…

The usual IT outlets typically are double outlets with to RJ45 jacks. Installers who prefer to pull only one cable to each outlet prefer duplex copper…

Every now and again one reads about RJ45 modules for 25 Gigabit Ethernet. The frequency range is said to be 1 MHz up to 1250 MHz. However, the…

Meter cabinets in the electrical infrastructure must increasingly be equipped with IT cabling for the use of intelligent electricity meters (smart…

The cabling standards specify not only distributors, they also specify the spaces that hold them. Read on to find out more.

The cabling standards specify cabling and connecting hardware. But they also specify distributors. Read on to find out more.

Optical fibers allow higher data rates and longer link lenghts than copper cables. Fiber optic cabling that runs up to the workplace is recognized by…

Often unloved but useful: Management and documentation of IT cabling can be more important than one might think. The standards provide guidance for…

Fire protection in buildings is important. Slow-burning products give people more time to leave the building and thus protect human lives. There is…

IT cabling standards also specify environmental conditions and IP and IK ratings. Read on to find out more.

Singlemode fibers offer highest data rates and link lengths of several kilometers. Inside of buildings, multimode fibers are preferred. Can the two…

More and more homes are connected to the internet using an optical fiber. This is where one comes across the terms FTTH and FITH. What’s the…

Are keystone modules standardizes? Do modules of one manufacturer fit into the module carriers of another manufacturer?

What is UPC polishing and what’s the difference between UPC and PC or APC polishing?

Is there a uniform APC polishing angle?

What are hex adapters and what’s the difference between duplex, quad and hex?

What is UPC polishing and what’s the difference between UPC and PC or APC polishing?

Some RJ45 jacks also accept RJ12 and RJ11 plugs and some don’t. What’s the difference between the three plugs and what happens when the wrong one is…

Corporate IT networks should be designed to manage interruptions. The last issue introduced redundant cabling in the riser. This issue focuses on…

Corporate IT networks should be designed to manage interruptions. The last issue introduced redundant cabling between distributors on the same network…

Corporate IT networks should be designed to manage interruptions. However it may well happen that a cable gets damaged. When redundant cables are…

More connections in less space has become a trend in fiber optic cabling as well. MDC, SN and CS are three compact connectors that have the potential…

Fiber optic cabling up to the workspace offers high data rates and long link lengths. In many projects floor distributors can be omitted. Terminal…

Data can be transmitted as common mode or differential mode signals. Read on to find out what that means and why differential mode signals are so much…

The terms “DTE” and “DCE” come from the very beginning of IT networks but they are still present today. Read on to find out what the terms stand for.

PoE, PoE+, PoE++, 4PPoE … read on to find out which PoE versions are recognized by the standard.

Common mode return loss (CMRL) is the ratio of an unwanted common mode signal to its part that is reflected to the transmitter. Read on to find out…

Return loss is the ratio of the original signal strength to its part that is reflected to the transmitter. Read on to find out more.

Insertion loss is a measure of the loss of signal strength along the link. Read on to find out more.

Impedance is the AC resistance of the link. Unlike DC resistance, impedance is a frequency-dependant parameter. Read on to find out more.

DC resistance unbalance between pairs is a measure how much the DC resistance of one wire pair differs from the resistance of another pair which is…

DC resistance unbalance within a pair is a measure how much the DC resistance of one wire differs from the resistance of the other wire within the…

DC loop resistance is the resistance of a wire pair. It is one of several parameters which are important for remotely powering devices via Power over…

The wires of the four pairs in a data cable have different twists which results in different overall lengths. Because of this, the signals travelling…

Circular connectors are proving their worth in a huge variety of different applications like industrial communication, automation, robotics, physical…

Does the cabling for 25 Gigabit Ethernet have to transmit only frequencies up to 1250 MHz? Can category 6A outlets be used for 25 Gigabit Ethernet in…

The fibre optic connection is finally coming into the home, bringing high data rates of 50 Mbit/s, 100 Mbit/s or more to every home. However, the…

Industry 4.0, Smart Factory, the Internet of Things, Internet of Everything – there is no shortage of buzzwords when it comes to the concept for…

End-to-end connection links enable efficient cabling without junction boxes and patch cables. DIN EN 50173-20 specifies three different types of link?…

More and more devices and components in modern buildings are powered over the data cable, eliminating the need for an electrical socket. Investors and…

Wherever telecommunication outlets and patch cords are unwanted for security or aesthetic reasons or where there is simply not enough room for them,…

IT connectors that are desingned for indoor use must not be used in outdoor applications. This includes IP67 rated industrial connectors. This white…