Free Essays on Ethernet

Ethernet In early 1970’s, Xerox Corporation introduced a different networking concept called Ethernet. The thick coaxial media system was the first media system specified in the original Ethernet standard of 1980. Today most sites use twisted-pair media for connections to the desktop. Ethernet is designed to run on a single transmission line to which all stations are connected. As with token ring, Ethernet is peer-to-peer; however no monitoring device is requires. Unlike token ring, Ethernet does not require that stations wait for a token to be passed before transmitting. Stations are able to connect directly to one another and pass data any time there is no activity on the network. The 10-Mbps Ethernet media varieties include the original thick coaxial system, as well as thin coaxial, twisted-pair, and fiber optic systems. The most recent Ethernet standard defines the new 100-Mbps Fast Ethernet systems that operate over twisted-pair and fiber optic media. Picture of the first Ethernet There are several LAN technologies in use today, but Ethernet is by far the most popular. Industry estimates indicate that as of 1994 over 40 million Ethernet nodes had been installed worldwide. The widespread popularity of Ethernet ensures that there is a large market for Ethernet equipment, which also helps keep the technology competitively priced. From the time of the first Ethernet standard, the specifications and the rights to build Ethernet technology have been made easily available to anyone. This openness, combined with the ease of use and robustness of the Ethernet system, resulted in a large Ethernet market and is another reason Ethernet is so widely implemented in the computer industry. The vast majority of computer vendors today equip their products with 10-Mbps Ethernet attachments, making it possible to link all manner of computers with an Ethernet LAN. As the 100-Mbps standard becomes more widely adopted, computers are bei... Free Essays on Ethernet Free Essays on Ethernet Ethernet uses a protocol called CSMA/CD. This stands for Carrier Sense, Multiple Access, Collision Detect. The Multiple Access part means that every station is connected to a single copper wire, or a set of wires that are connected together to form a single data path. The Carrier Sense part says that before transmitting data, a station checks the wire to see if any other station is already sending something. If the LAN appears to be idle, then the station can begin to send data. An Ethernet station sends data at a rate of 10 megabits per second. That bit allows 100 nanoseconds per bit. Light and electricity travel about one foot in a nanosecond. Therefore, after the electric signal for the first bit has traveled about 100 feet down the wire, the station has begun to send the second bit. However, an Ethernet cable can run for hundreds of feet. If two stations are located, say, 250 feet apart on the same cable, and both begin transmitting at the same time, then they will be in the midd le of the third bit before the signal from each reaches the other station. This explains the need for the Collision Detect part. Two stations can begin to send data at the same time, and their signals will collide. When such a collision occurs, the two stations stop transmitting, and try again later after a randomly chosen delay period. While an Ethernet can be built using one common signal wire, such an arrangement is not flexible enough to wire most buildings. Unlike an ordinary telephone circuit, Ethernet wire cannot be just spliced together, connecting one copper wire to another. Ethernet requires a repeater. A repeater is a simple station that is connected to two wires. Any data that it receives on one wire it repeats bit-for-bit on the other wire. When collisions occur, it repeats the collision as well. In common practice, repeaters are used to convert the Ethernet signal from one type of wire to another. In particular, when the connection to the d... Free Essays on Ethernet Ethernet In early 1970’s, Xerox Corporation introduced a different networking concept called Ethernet. The thick coaxial media system was the first media system specified in the original Ethernet standard of 1980. Today most sites use twisted-pair media for connections to the desktop. Ethernet is designed to run on a single transmission line to which all stations are connected. As with token ring, Ethernet is peer-to-peer; however no monitoring device is requires. Unlike token ring, Ethernet does not require that stations wait for a token to be passed before transmitting. Stations are able to connect directly to one another and pass data any time there is no activity on the network. The 10-Mbps Ethernet media varieties include the original thick coaxial system, as well as thin coaxial, twisted-pair, and fiber optic systems. The most recent Ethernet standard defines the new 100-Mbps Fast Ethernet systems that operate over twisted-pair and fiber optic media. Picture of the first Ethernet There are several LAN technologies in use today, but Ethernet is by far the most popular. Industry estimates indicate that as of 1994 over 40 million Ethernet nodes had been installed worldwide. The widespread popularity of Ethernet ensures that there is a large market for Ethernet equipment, which also helps keep the technology competitively priced. From the time of the first Ethernet standard, the specifications and the rights to build Ethernet technology have been made easily available to anyone. This openness, combined with the ease of use and robustness of the Ethernet system, resulted in a large Ethernet market and is another reason Ethernet is so widely implemented in the computer industry. The vast majority of computer vendors today equip their products with 10-Mbps Ethernet attachments, making it possible to link all manner of computers with an Ethernet LAN. As the 100-Mbps standard becomes more widely adopted, computers are bei...

Tan vs. Tanto in Spanish

Tan vs. Tanto in Spanish Tan and tanto can be a source of confusion in Spanish because they both can used in comparisons such as as green as and as much as. But the two words, although closely related, are used in grammatically different ways and cant be substituted for each other. One way to think of the main difference between the two is that tan is used as an adverb in those constructions, while tanto is used as an adjective. For this reason, tan doesnt change with the context, while tanto can also exist in the inflected forms tanta, tantos, and tantas. Using Tan Tan basically means so, sometimes such a or as, and is used only before adjectives or adverbs (or nouns used as adjectives). Rita es tan alta como Marà ­a. (Rita is as tall as Marà ­a.)Rita habla tan rpido como Marà ­a. (Rita talks as fast as Marà ­a.) Sentences such as these are by far the most common usage of tan. The phrase  quà © tan  Ã¢â‚¬â€¹can often be translated as how:  Ã‚ ¿Quà © tan inteligente eres?  (How intelligent are you?) Using Tanto Tanto basically means so much or so many or, when used with como, as much or as many. Tengo tanto dinero como Juan. (I have as much money as Juan.)Tengo tanto dinero que no sà © quà © hacer con à ©l. (I have so much money I dont know what to do with it.) Tanto also can be used to make other kinds of comparisons and has a wide variety of colloquial uses; under some circumstances it can be used not only as an adjective but also as a noun, pronoun or adverb. A good dictionary will list at least two dozen different uses. Some examples: Tengo quince y tantos nietos. (I have 15 or so grandchildren.)No quiero estudiar tanto. (I dont want to study so much.) Tanto as a Conjunction Tanto as a fixed form is sometimes used as a conjugation, typically in a phrase that includes como. Dejar de consumir tabaco causa sà ­ntomas tanto fà ­sicos como mentales. (Quitting using tobacco causes symptoms that are as much physical as mental.)Soy consciente que tanto yo como el resto podemos dar un poco ms. (Im aware that I as much as the rest of us can give a little more.) Sample Sentences Using Tan and Tanto El troll de Facebook dice: Tan importante soy que me tienen que bloquear para ser feliz. (The Facebook troll says: I am so important that they have to block me to be happy.) Mà ©xico est tan listo como Panam. (Mexico is as ready as Panama.) El centro de la Tierra est tan caliente como el Sol. (The center of the Earth is as hot as the sun.) Descubre quà © tan hombre eres con este machà ³metro. (Find out how much of a man you are with this macho-meter. This sentence construction, which is unusual, is an exception to the rule that tan isnt used with nouns.)  ¡Quà © tiempo tan feliz! (What a very happy time!) Voy a ser tan rica como pueda. (Im going to be as rich as I can.) Dime tu estilo de crianza y te dirà © quà © tan exitoso podrà ­a ser tu hijo. (Tell me your parenting style and Ill tell you how successful your child could be.)  ¿Es necesario consumir y comprar tanto para ser feliz? (Is it necessary to consume and buy so much to be happy?)  ¡Tengo tanto para hacer! (I have so much to do!) Nunca se vendieron tantos coches elà ©ctricos como en mayo. (Theyve never sold so many electric cars as in March.) Es irà ³nico cà ³mo la vida te da tanta felicidad y luego te llena de tanta tristeza. (Its ironic how life gives you so much happiness and later fills you with so much sadness.) Hay dà ­as que no quiero nada, pero necesito tanto. (There are days that I dont want anything, but I need so much.) Tanto ella como su marido recibieron la noticia con entusiasmo. (She as much as her husband enthusiastically received the news.) Tanto Mà ©xico como Canad han buscado mayor presencia en la ONU. (Mexico as much as Canada has looked for a greater presence in the U.N.) No como tanto ella. (I dont eat as much as she.) Despuà ©s de tantos dà ­as perfectos, empecà © a creer que toda la vida serà ­a asà ­. (After so many perfect days, I began to believe that all of life would be like that.) El amor durar tanto como lo cuides, y lo cuidars tanto como lo quieras. (Love will endure as much as you nurture it, and you will nurture it as much as you want it.) Key Takeaways Both tan and tanto can be used in comparisons meaning as much as or as ____ as, but they arent interchangeable.Tan functions as an adverb, so it doesnt change form with the nouns or adjectives around it.Tanto typically functions as an adjective, so it can take other forms, namely tanta, tantos, and tantas. On those rare occasions it functions as a conjunction, however, it doesnt change form.