Blog posts tagged with 'cable'

Cable VGA to VGA

VGA stands for Video Graphics Array. VGA is the most popular video format used by Computers/ LCD Projectors, etc.  A Computer CPU has a VGA-Out port through which the imagery/ video is carried via a VGA Cable to be displayed on the Computer Monitor – CRT/ LCD Monitor, Plasma/LED Display terminal, LCD Projector, etc. VGA format can support multiple image resolutions. 

VGA Cables are required to connect VGA Ports in CPU to Computer monitors, plasma displays, LCD monitors, Projectors, etc. They are also used to connect the VGA Splitters and VGA Switches to display units.

The commonly available VGA Cable lengths are : 1.5 meters, 3 meters, 5 meters, 10 meters, 15 meters, 20 meters, 30 meters, etc. 


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Ethernet Cable Cat5E Cat6

Connect network devices to a LAN

Network Cat5E/Cat6 Cables:


Network cables are used to connect the Network equipments (Computers, Printers, Servers, etc) with the Network switch to create a Local Area Network (LAN). Network cables enable individual computers to access printers, computer servers and the Internet through active network components like network switches/ routers, etc. 

There are two types of Network Cables that are popular – UTP Cables and STP Cables. UTP refers to Unshielded Twisted Pair and STP refers to Shielded Twisted pair. Both of them contain four individual pairs of copper cables within an overall insulator material. The copper strands in each pair are twisted over one another, to reduce the electromagnetic interference. UTP cables are used within buildings, offices & STP cables are used in industrial environments where one can expect  Electromagnetic Interference as they have additional metallic shielding layers.  

There are various grades of Network cables available in the market. Two of the most popular cables are Cat5E Network cables and Cat6 Network cables. Cat5E network cables support a maximum of 100 Mbps bandwidth over a maximum distance of 100 meters. Cat6 network cables support 1000 Mbps bandwidth over a maximum distance of 100 meters. 

Network cables are generally sold in bulk – 295 meters per box, for example. Network personnel decide the lengths required for connecting each network device with the network switch and cut the cables using cabling tools for the required length. They then crimp either end of the cable with the right copper cable pair arrangements, cable plugs and cable boots to be able to connect to network devices with an RJ-45 interface. 

Network cables are copper cables and hence they should not be taken along with power cables due to interference. Network cables should not be bent too sharply during installation as over bending might lead to leakage of signals. 

Network Patch Cords:

Network patch cords are similar to network cables but they are shorter in length. They come with factory crimped network plugs and boots at either end. The common sizes of network patch cords include 3 feet, 6 feet, 9 feet, 15 feet, etc.   

Structured cabling standards recommend that small patch cords connect from the individual network devices (computers, etc) to an I/O box on the wall with RJ-45 jacks. A network cable then connects to this I/O box from behind and then goes all the way to the network rack where it terminates behind a patch panel. From the patch panel, another network patch cord connects to the switch port. 

Since the patch cords are factory crimped, the quality of termination of RJ-45 jacks is better and these cables can be expected to give a long life. Moreover, they are more susceptible to adds/moves and changes and hence they are manufactured with extra rigidity and sturdiness. 

While network cables are expected to be fixed permanently, network patch cords can be removed and changed for testing/ moving network equipments from one place to another. 

The type of the network patch cord (UTP, STP, etc) and their grade (Cat5E, Cat6, etc) should match with each other during a network installation, to realize the full bandwidth and distances supported by them. 

Visit our store to buy network cables online.




Cable Tester

What is a Cable Tester?


A cable tester is a detachable two piece component that is used to test the functioning of different types of cables like Computer Cables (RJ-45), Telephone Cables (RJ-11), USB Cables, etc. They generally have some kind of visual indicators to display the test results. 

What can a Cable Tester test for? 

On a basic level, Cable Tester can test if the cable is working or not. Specifically, they can test for different types of faults in cables like continuity, dislocation, open circuit, short circuit, cable pairing faults, or indications like shielding indication, straight cable/ cross over cable indication, etc. 

How does a Cable Tester work?

A cable tester generally consists of two parts – The main unit that contains the display/ connectors and a remote detachable unit that contains the connectors. A cable tester works using batteries and in most cases, the required batteries need to be purchased additionally. 

A cable tester can test long cables as the remote unit can be detached from the main unit and carried across to the other end of the cable. 

If one needs to test a computer cable (RJ-45, Cat 5E/6), for example, they need to plug in one end of the cable to the main unit and plug in another end of the cable to the remote detachable unit. 

When both ends are connected, the testing button needs to be pressed. Depending on the type of the tester, LED lights may glow in sequence on both the indicators. Lights 1 to 8 glow one after the other sequentially, if the connection is fine. 

With some types of cable testers, there is an LED display which presents the test results using diagrams and on-screen indicators. Some of them even come with an audio alert on the type of fault. They can speak/ beep indicating if the cable is fine or not!  

The cable testing process is similar for other cables as well, except that RJ-11 cables need to be plugged in the RJ-11 interfaces and USB cables need to be plugged in the USB interfaces. So, when you are buying a cable tester, you can see how many physical connectors are present in each piece in order to determine how many types of cables can be tested using them.

For USB Cables, four lights glow sequentially if everything is fine and for RJ-11 cables two lights glow at both ends. But this depends on the type of tester involved and the type of indication provided by the cable tester.

How can one identify cable faults using cable testers?

In an RJ-45 cable for example, if the second light doesn't glow at one end and all other lights glow sequentially, it means that there is an open circuit in Pin 2. 

There might be a separate light for shielded cable indication and it glows to indicate if the inserted cable is of shielded type or not.

There may be a separate non-parallel light that glows if the conductors are crossed. 

If there is a short circuit, the exact pins that are affected can be indicated by the glow of their respective LED light indicators. 

These are some of the common fault indications and depending on the cable tester and make, many more type of faults can be indicated. One can find exhaustive information on the type of faults and their indications by going through the installation manual. 

Some cable testers come with an automatic sleep mode / deactivation mode for saving the battery power. The battery life is generally quite long for cable testers and they can normally last for more than 50 hours of testing. Some of them even give an indication when the battery is low and needs to be replaced. 

Most of the cable testers come with a carry case in order to be able to carry them around easily.  

You could visit our store to buy the Cable Testers Online.  



DSL filter kit

Most of us connect to the Internet using wired broadband connections provided by our telephone provider. The stability and speeds offered by the single pair copper cable, that carries both Voice (required for phone communications) and Data (required for Internet browsing) has been getting better with each passing day. 

One of important reason for the phenomenal success behind broadband Internet connectivity is its ability to allow simultaneous voice sessions along with data sessions. So, one can keep talking on the phone while others are browsing on the Net. Along with the higher speeds offered by broadband, this simultaneous utility (of voice and data) is an important reason for its instant popularity.    

One needs an DSL/ADSL Splitter that accepts the combined voice+data signal offered by the telephone provider, to split it in to voice signal and data signal. These two signals are offered to the user in two separate output ports. The connection from one port goes to the telephone instrument and the other, goes to the computer through the DSL/ADSL Modem.  Of course, both of them can be accessed simultaneously.

But, there is one issue though. Sometimes, when we are talking on the phone we tend to hear some disturbance (noise) if the Internet connection is being used by someone else. This is a bigger issue for people who have multiple phones in their house (set-up in parallel). 

Even though certain DSL/ADSL splitters can filter out the data signals from the voice port, they are limited to the one phone that is connected directly to them. Besides, some DSL/ADSL splitters cannot fully filter out the data signals (on the voice port). 

There is another issue: What if there are a few phones connected in parallel? Or, what if there is a fax machine connected in parallel? 

That's why one needs an DSL/ADSL Filter. The DSL/ADSL filter, filters out the data signals from the voice signals and drastically reduces the interference (disturbance/ noise) on the Telephone, when both voice signals and data signals are received simultaneously. 

Actually, the DSL/ADSL filter contains an analog low-pass filter circuitry that eliminates high frequency data signals. 

The commonly available DSL/ADSL filters are In-line devices that accept the phone-line input (from the service provider) on one side and plug the line going to the telephone instrument, on the other side. An DSL/ADSL In-line filter  needs to be positioned just before every phone/ fax machine in order to eliminate the noise/ disturbance one gets to hear (while speaking), when an Internet connection is in progress simultaneously.      

What about wall mounted phones? One cannot connect this DSL/ADSL filter behind wall-mounted phones right? Yes. But, there is a separate DSL/ADSL Wall-mountable Filter that can be attached just behind the wall mounted phone (actually mounted in-between the phone and the wall jack) and the phone can still be hanging on the wall from over the DSL/ADSL wall-mountable filter, in the same way as it was before!  

There is only one thing that is missing to complete the connection – A Phone-cord that connects from the voice port of the splitter to your telephone. 

The Alcatel DSL/ADSL filter kit (DSL/ADSL filter + phone cable + wall+ splitter 1xRJ11 to 2xRJ11) contains all the above mentioned items as a package, so that a customer can get the best value out of it, and remain free from all distraction/ noise while talking to someone on the phone. 

The Alcatel DSL/ADSL filter kit contains the following:

DSL/ADSL In-line Filter – 5 Nos.
DSL/ADSL Wall Filter – 1 No.
DSL/ADSL Dual-line Splitter – 1 No.
Phone-cord (14 feet, UTP, RJ-11) -  1 No.

You could visit our store to buy the Alcatel DSL/ADSL filter kit Online.  

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