cables and connectors in the computer network
Cable and connectors: In this post, we share knowledge of cable and connectors. At the end of this post you will be able to define cable and its types, explain connectors and Describe the process of crimping.
cables and connectors
Cable form the transmission media for a network. Transmission media or channels, also known as links, lines or path, are used to interconnect the nodes in a network. Transmission channels are of different types of communication wires and cables such as coaxial/helix cable, optical fibre cable, twisted pair cable and cross over cable.
The following table lists different types of cables used in networking:
Twisted pair: Have two conductors that are twisted together to cancel out the electromagnetic interference that may come from external sources. This type of cable is almost the same as a paired cable. The difference is in the two twined inner wires which are insulated, unlike the paired cable.
Used for transmission of data over networks such as, LAN.
Coaxial/helix cable: Has a thin conducting wire inside a tubular conducting shield, which is protected by a tubular insulating jacket.
Used to connect video equipment and carry television signals.
Optical fibre cable: Contains one or more optical fibres for carrying a light. The optical fibres are coated with plastic layers and secured in a protective tube.
Used for long-distance communication.
Optical fibre cable(single mode): Has small-sized diametric core and permits a single mode of light to propagate through it. As a result, it reduces the number of light reflections when the light passes through the centre. This decreases the attenuation and enables the signal to travel further.
Used for a long-distance coverage with a very high bandwidth requirement.
Optical fibre cable(multi-mode): Has big diametric core and permits several modes of light to propagate through it. The number of light reflections formed when the light passes through the centre is more. This enables a larger quantity of data to pass through at a given time. The strength of the signal decreases over long distances because of the increased dispersion and attenuation.
Used for backbone applications in buildings because of the reliability and high capacity.
Cross over cable: Connects computing devices, often of the same type such as two switches.
There are variously used for connecting cables in networking as shown in the following figure:
Crimping means joining two pieces of metal, generally wire and a connector, together with by deforming one of them and enabling one to hold the other. The resultant deformity is known as a crimp. The following steps involved in crimping:
- Place the connector
- Adjust and position
| Note: In the case of crimping, pliers should not be used as the deformity cannot be formed properly.|
If there is air in between the crimp and the connector, it collects moisture. This eventually causes corrosion in the wire and can lead to a connection failure.
Steps for crimping RJ45 Cable
For crimping RJ45 cable code of the internal wires is to be followed.
- To make a straight cable, the colour code is listed in the following figure:
- To make a crossover cable, the colour code is listed in the following figure
The steps for crimping RJ45 cable are as follows:
Step1: Strip 2 inches of the outer cover from the cables end with a utility knife. Stripping the cable
Step2: Pull the twisted pairs of wires backwards and cut the core. cutting the core
- Pull wires backwards
- Cut the core
Step3: Make the twisted wires straight using tweezers and keep them arranged in a row. straightening and arranging the wires
- Straighten the twisted pairs
- Arrange the wires in a row
Step4: Place the untwisted wires in a position from right to left according to the colour code of the wires and then trim the wires up to the suitable length.Trimming of wires
Step5: The wires are inserted into RJ-45 connector. RJ45 connector crimped to the cable using a crimping tool by compressing the jacket as well as the cable into the connector in such a way that the wedge at the base of the connector is pushed into the jacket.
Crimping the connector
- Insert into connector
Conclusion for cables and connectors :
so that we read about Cables and connectors now you can define cable and its types, explain connectors and describe the process of crimping