The network uses Copper media because of its advantages however it has also some disadvantages. In this session, we will discuss all characteristics of copper cabling.
• It Is inexpensive
• Low resistance to electrical signals
• easy to install
• power over Ethernet (POE)
• More flexible
• Electromagnetic interference (EMI)
• Radio Freq Interference (RFI)
• Break Easily
• It can support maximum up to 100 meter
Data is transmitted on copper cables as electrical pulses. A detector in the network interface of a target device should receive a signal that can be successfully decoded to match the signal sent. on the other hand the longer the signal travels the more it deteriorates. This is referred to as signal attenuation. For this reason, all copper media must follow strict distance limitations as specified by the guiding standards. Above mention advantages and disadvantages are the main characteristics of copper media. Some are general which is no further discussion required. Some are required more attention.
Electromagnetic interference (EMI) or radio frequency interference (RFI)
EMI and RFI signals can deform and corrupt the data signals being passed by copper media. Potential sources of EMI and RFI include radio waves and electromagnetic devices; such as fluorescent lights or electric motors etc.
Crosstalk is a disturbance caused by the electric or magnetic fields of a signal on one wire to the signal in the closest wire. In telephone circuits; crosstalk can result in hearing part of another voice conversation from a nearby circuit. Specifically, when an electrical current flows through a wire, it creates a small circular magnetic field around the wire, which can be picked up by a nearby wire.
To counter the harmful effects of EMI and RFI; some types of copper cables are wrapped in metallic shielding and require proper grounding connections.
To counter the negative effects of crosstalk; some types of copper cables have opposing circuit wire pairs twisted together; which effectively cancels the crosstalk.
The weakness of copper cables to electronic noise can also be limited by:
- Selecting the best type of cable most suited to a given networking environment and situation.
- Designing a cable infrastructure to avoid known and potential sources of interference in the building structure.
- Define terms related to callings, such as shielding, crosstalk, attenuation, and plenum.
- Using cabling techniques that include the proper handling and termination of the cables.
- Identify the primary types of network cabling
- Distinguish between baseband and broadband transmissions and identify appropriate uses for each