Network technologies and system administration - Assignment Example

Transmission media is very important in the transmission of signals. For the transmission of the signal copper wires are being in utilization for many years however, as the technology regarding the transmission media developed, wireless technologies got the importance as wireless technologies require less management and lack the burden of wires. In a wired transmission system, digital signals are utilized in the transmission, where various voltage levels are considered to be binary zero and binary one (Omega.com, np). The signal is then transmitted to the copper wire as the voltage signals and a reference voltage is also transmitted.

At the other side the transmitted signal is received and the reference voltage signal is created and thus the wired transmission and reception system works. In wired communication twisted pair, coaxial cable and optic fiber cables are utilized. However, optic fiber cable does not come in the category of copper wire and signal is transmitted in the form of light. The major problem that arises in the transmission of signal through the wired medium is that the copper wires are much influenced by the electromagnetic energy and thus a distorted signal is received due to the interference of the electromagnetic radiations.

These electromagnetic radiations are produced by the electrical appliances and transmission lines near the signal wire. This type of problem is more in twisted pair cable as compared to the coaxial cable. However, the twists in the cable help minimize the interference. Another problem with the wired transmission is the difficulty in the management and detection of problem (Polenin, np). There is a need to replace the whole cable if a little defect in the cable arises like small cuts, etc. In order to eliminate the problems of the electromagnetic interference, a pair cable is twisted to reduce the interference.

Boosters are utilized at after some fair distances to recover the distorted signals to the original signals. Boosters also amplify the signals to the desired amplification. In the coaxial cable, metal shielding prevents the loss of the signal and avoids electromagnetic interference. However, the outer insulation is such made to prevent environmental damage and the preventions against cuts, etc. Ethernet is a part of computer networking technology for local area network which is commercially started in 1980.

It is consisted of IEE 802.3, LAN technology. In the OSI orientation arrangement, Ethernet is at the data link layer. Ethernet distributes a flow of information through packets which, are known as frames. Each frame consists of source and destination dresses and error checking data so that damaged data can be easily identified and rebroadcasted (Pidgeon, np). As we have discussed data packet on the wire is known as a frame. A frame initiates with the preamble and start frame delimiter. First advantage is that it is conceptually it is simple like it has coax cable and T adapters and no hubs, transceivers and other devices.

It is less price device. There is a high level of noise immunity. Disadvantages are Ethernet is difficult to change. Its configurations are not edited easily. If any device or cable section fails, is demolishes the entire network. Ethernet frame is also called as Ethernet link. In the frame structure, octets are distributed to make the Ethernet do its job in a right way. For example, the frame allocated seven octets to the Preamble from 10101010, preamble have the responsibility to synchronize clocks or receiver and sender.

For addresses, all adapters receive the frame on LAN at 6 byte. The frame structure type is utilized to identify the higher layer protocol. At receiver, frame is checked for error, if there is any errors present the frame dropped. The MAC Destination takes about 6 octets, MAC source takes about 6 octets, payload takes octets from the rage of 45 to 1500 and inter-frame gap takes about 12 octets. An