Three Major Types Of Network Cables Used In Communication Systems
Fiber optic cable, twisted pair cable and coaxial cable are three major types of network cables used in communication systems. Each of them is different and suitable for different applications.
Fiber Optic Cable
Fiber optic cable consists of a bundle of glass threads, each of which is capable of transmitting message modulated onto light waves.
Fiber Optic cable has a complex design and structure. This type of cable has an outer optical casing that surrounds the light and traps it within a central core. The inside of the cable (the core) can be configured in two different ways – Single-mode and multi-mode; although the difference may seem small, it makes a huge difference to the performance and usage of fiber optic cables.
Twisted Pair Cable
Twisted pair cable is a type of ordinary wiring which connects home and many business computers to the telephone company. It is made by putting two separate insulated wires together in a twisted pattern and running them parallel to each other which helps to reduce crosstalk or electromagnetic induction between pairs of wires. Twisted pair cable is good for transferring balanced differential signals. The practice of transmitting signals differentially dates back to the early days of telegraph and radio. The advantages of improved signal-to-noise ratio, crosstalk, and ground bounce that balanced signal transmission brings are particularly valuable in wide bandwidth and high fidelity systems.
According to whether the cable has a shielding layer, there are two common types of twisted pair cables—shielded twisted pair (STP) cable and unshielded twisted pair (UTP) cable. STP cable is available for Token Ring networks, while the UTP cable is more suitable for Ethernet networks. The most common UTP cable types applied in Ethernet network are cat5e, cat6a and cat7 cables, etc. The following image shows the different structure of UTP and STP cables.
Coaxial cable, or coax cable, is another type of copper cable which has an inner conductor surrounded by a foam insulation, symmetrically wrapped by a woven braided metal shield, then covered by in a plastic jacket (as shown in the following image). This special design allows coaxial cable runs to be installed next to metal objects such as gutters without the power losses that occur in other types of transmission lines. Coaxial cable acts as a high-frequency transmission cables made up of a single solid-copper core and compared to twisted pair cable, it has 80 times or more the transmission capability. This kind of cable is mainly adopted in feedlines connecting radio transmitters and receivers with their antennas, computer network connections, and distributing cable television signals.
Choosing among coaxial cable, twisted pair cable and fiber optic cable mainly depends on your needs and network topology. You can balance the cost and the requirements of bandwidth to make a choice. No matter coaxial cable, twisted pair cable or fiber cable, suiting your network requirements is the best.