The Ethernet Technology Report Essay Example | Topics and Well Written Essays - 1000 words

The Ethernet Technology Report - Essay Example For transporting digital bits of data through the carrier waves, Ethernet has some encoding techniques. These encoding techniques aid in synchronizing the data sending and data receiving stations and providing a signal with strength sufficient enough to deliver a required amount of data rate. So, the difference in encoding techniques relate to the difference in the data transfer speed provided by the Ethernet cable. For instance, the three encoding techniques Manchester, 4B/5B and 8B/10B are used for the providing Ethernet LAN of speeds 10Mbps, 100 Mbps and 1Gbps respectively (TechFest.com, 1999). Manchester encoding delivers a signal of frequency 10MHz which is sufficient to provide a data rate of 10Mbps for the 10Base5 and 10Base2 coaxial cables. The installation is easy and new systems can be added easily. However, owing to the bus topology (in 10Base5) and the fact that the cabling is half duplex (i.e. same cable used for sending and receiving), chances of collisions would be mor e and the throughput of the system would be less. In case of daisy chains (10Base2), routing difficulties would be present. Secondly, the higher data rates cannot be achieved due to coaxial cables. In case of using 10BaseT twisted pair cables, 20Mbps can be achieved owing to full duplex mode. New hosts can be added easily in the supported star topology network. However, repeaters are required after every 100m unlike 10Base5 and 10Base2. When using 10BaseFL, repeaters are not needed till 1000m. The 4B/5B encoding delivers a 62.5MHz frequency signal on the 100Base-Tx Cat 5 twisted pair cabling. A signal of maximally 100MHz is enough to be transmitted over a medium of 100Mbps. In full duplex mode, any new host can be added without affecting the collision rates. 4B/5B encoding is also used in 100Base-Fx cables.

Short reaction on Casablanca 1942 Essay Example | Topics and Well Written Essays - 250 words

Short reaction on Casablanca 1942 - Essay Example me even more popular over the years, lies in the fact that since 1957 many cinemas began to show the movie during summer exams, first in Harvard, and then and in other universities. Twenty years later it was revealed that Casablanca is shown on TV in the USA more often than any other movie in order to attract the new audience (Ebert, 1996). The movie is sensitive, kind, magically romantic and very fascinating, though it is neither thriller, nor the detective story. It is a real American movie, which is loved by all Americans and very informative for foreigners, because it shows the life and history of real Americans. The movie Casablanca will not touch your heart as military drama, but, as the romantic melodrama performed in curious style and played by magnificent actors of the era, it represents a perfect creation. A little outdated, but the one, which did not loose its appeal through