Tecnologie |
Dettaglio dell'articolo:
giovedì 08 novembre 2012
I supporti per rete Ethernet si dividono principalmente in due categorie: a) Cavi a doppino: costituiti da due fili conduttori in rame intrecciati per cancellare le interferenze elettromagnetiche da fonti esterne. Nei cavi moderni si hanno due o quattro coppie di fili intrecciate tra loro. Vengono identificati via una denominazione composta da :
I tipi più diffusi sono: 10BASE-T 100BASE-T 1000BASE-T = gigabit Ethernet Un'ulteriore evoluzione dello standard è costituita dalla Fast Ethernet, che viene indicata aggiungendo un suffisso X alla denominazione. I tipi più diffusi sono: 10BASE-TX 1000BASE-TX Il connettore standard per questi cavi è il modulare 8P8C, tra i quali il più diffuso èl' RJ-45
b) Fibre ottiche: sono fibre flessibili e trasparenti, di vetro (silice) o plastica. La luce viene trasmessa tra diersi punti della fibra che agisce come una guida d'onda tramite un rivestimento riflettente che fa riflettere un raggio luminoso da un punto ad un'altro lungo la medesima direzione all'interno della fibra. Le fibre che hanno più modi (o cammini) di trasmissione del segnale sono chiamate fibre multi-modali (MMF), mentre quelle che supportano solo un unico modo sono chiamate fibre monomodali (SMF). Le fibre multimodali hanno generalmente un diametro più ampio, e sono utilizzate per brevi distanze, le fibre monomodali invece hanno un diametro più ridotto e questo consente la trasmissione fino a distanze 50 volte superiori che le fibre multimodali. Usate per il Fast Ethernet, si dividono in tipologie con una denominazione simile a quella dei doppini: 100BASE-FX: usano luce a lunghezza d'onda 1300 nm (vicino infrarosso), con due fili distinti per la ricezione e la trasmissione. 100BASE-SX: usano luce a lunghezza d'onda inferiore rispetto alle FX, per cui supportano una distanza minore, ma hanno anche un costo minore. Ci sono due fili distinti per la ricezione e la trasmissione. 100BASE-BX: hanno un filo unico per la ricezione a la trasmissione, i due segnali downstream (dal netwrok verso l'esterno) e upstream (dall'esterno al network) anche lunghezze d'onda diverse. E' necessario che i due segnali siano combinati in un segnale unico da un dispositivo multiplexer, e che quindi il segnale unico sia scomposto nei segnali originari da un demultiplexer. 100BASE-LX10: hanno due fibre monomodali distinte, con lunghezze d'onda simili a quelle delle FX I convertitori multimediali (file media converters) hanno il compito di collegare tra loro segmenti di rete Ethernet con supporti diversi, ed ogni convertitore opera la conversione da un singolo tipo di rete ad un altro singolo tipo. Alcuni possono includere un modulo SFP. Convertitore da 10/100Base-TX a 100Base-SX: Convertitore da Gigabit Ethernet ad un modulo SFP: Inviato da: GRLpGpAG il: 2019-04-24 11:37:17.399645 Inviato da: Leonidas il: 2019-04-23 20:49:52.488709 Differenti condizioni tipiche per i metodi casual e di nove metri di preferenze nel settore dei servizi. Desigur, gustosa nostrère de jureri um ocu ou ou ou online online online online online online Inviato da: Linu Tudor il: 2019-07-31 18:09:30.214234 Shoe Net, June 04, christian louboutin shoes the red bottom shoes main nike outlet character of this street shoot christian louboutin shoes is nike shoes Olivia & 12539; adidas sneakers Palermo, white shirt, black shorts, new necklace, air max natural nike roshe run beauty. Olivia Palermo is beautiful, young and wealthy. There is a tendency for celebrities to replace nike factory outlet stars as new generation idols. They are rich in beauty and have a first-class taste. They are new stars in New York's upper-class social circles. They are shining among the adidas outlet new generation of celebrities. Lady adidas superstar GaGaGa, a famous woman who always dresses differently nike outlet from ordinary adidas stan smith people, has become a fashion icon. Her classic style nike factory store has been imitated by numerous fashion magazines. Who is christian louboutin sale Paris nike outlet store Hilton's jordan 5 pop icon? I believe many fashion-loving MMs will think adidas yeezy of Paris cheap christian louboutin shoes & Hilton, a famous woman. Her clothes always lead fashion and let all MMs imitate it. It has jordan 11 entered the autumn, and a variety of fashion clothes have nike outlet emerged in endlessly. What adidas stan smith are the necessary items for this autumn? Look at Hilton to guide us. Kim-Kardashian white-collar adidas sneakers MMs are jordans on sale following the example of Jin & 12539. Kardashian is nike air max wearing a white tight skirt, deep V nike air max design, can show a full chest, nike outlet store loose hip christian louboutin design, will not nike outlet store appear too nike store large PP, elegant temperament, very nike outlet store suitable cheap jordan shoes for OLMMs louboutin shoes to wear when they nike shoes attend PARTY. Whitney - Porter Whitney & Potter, nike air max a reality show host, has become nike factory outlet a frequent under armour street photographer. red bottom heels More and more fashionable, she wore a blue-green checked short shirt jacket yesterday, matched with cheap jordans short pants, purple high heels, very jumping TONE, full of cheap christian louboutin shoes youth. Every time Tyler Sweetford appeared, it brought louboutin shoes us a sweet jordan 11 and air max fresh trend. This time, Tyler Sweetford wore a white student-style shirt, a blue skirt with small boots, and there was christian louboutin sale an English style of students all over his cheap christian louboutin body, with the feeling nike air max of a familiar red bottom heels neighbor's school cheap christian louboutin flower. If you like such a campus dress, you might as well adidas yeezy try it out. christian louboutin sale Blake-Lively Blake & #12539; red bottom shoes The nike outlet online sexy tall Beauty of Lively, dressed in clothes, is indeed full of star flavor. White translucent shirt nike store with black nike factory outlet shorts, black high-heeled adidas outlet christian louboutin sale shoes, the whole temperament is excellent, intellectually free temperament, urban white-collar MM must follow suit. Inviato da: Cady il: 2019-05-06 03:58:18.524933 That's such the unusual and interesting technology. I find your website as a good one. You should also cover a topic of online casino technologies. It also deserves attention! Inviato da: JonCarey il: 2019-02-10 10:19:46.935143 Shoe Net, October adidas originals 10, how can pink colours not be loved? cheap christian louboutin shoes Cool autumn jordans on sale must not louboutin shoes be christian louboutin outlet surrounded by black, white and grey tones, dare to adidas outlet try jordan 11 Pink and jordans on sale tender colours, so that your overall aura changes greatly, jordan 5 skillfully wearing colourful make your adidas nmd clothes smaller and more innovative. christian louboutin shoes If you dare christian louboutin shoes not challenge adidas yeezy the bold attire that may christian louboutin outlet be surrounded by spectators, then try to match cheap christian louboutin shoes it adidas superstar with small-area adidas stan smith items such as vest, half-length skirt jordans for sale and seven-minute red bottom shoes pants. Now the most cheap christian louboutin popular short-edition louboutin shoes knitted sweater, the overall design is very feminine, can louboutin shoes well decorate the body, louboutin shoes match cheap jordans with cheap jordan shoes red bottom shoes high-waist lace long skirt, showing the elegant christian louboutin sale and graceful feminine charm. Autumn cheap christian louboutin essential classic cheap christian louboutin windbreaker, collar and sleeves are color matching christian louboutin sale design, jordan 5 loose format, comfortable to wear, belt configuration also highlights the waist, slim trousers and T-shirt collocation appears neat adidas originals jordan 11 and generous. Beautiful and red bottom shoes practical casual adidas yeezy knitted dress, half-sleeve design, with christian louboutin shoes a slightly cute adidas outlet and witty cheap jordan shoes feeling, A shape, waist-closing tailoring is excellent, showing the perfect S-curve body. Super cheap christian louboutin red bottom heels handsome model, a dress with a cheap jordans sense of overalls, with cheap christian louboutin shoes pockets on the chest, elastic waist tightening, with adidas stan smith high heels and christian louboutin outlet boots, the overall shape is christian louboutin outlet minimal without losing air. The temperament red bottom heels is red bottom heels adidas sneakers very good. A-shaped half-length skirt adidas nmd with jordans for sale a little witty feeling, matched christian louboutin shoes red bottom heels with a red bottom shoes slim waistcoat adidas sneakers and knitted christian louboutin sale cardigan, looks adidas superstar dignified christian louboutin sale and gentle, fearful and feminine. (Cooperative cheap christian louboutin shoes Media: Clothing Matching) Inviato da: Cadence il: 2019-04-18 20:59:16.876483 Some Java functions, such as sort, are particularly appropriate by GPU processing? Inviato da: pay for research paper il: 2019-03-13 11:04:47.892525 Boots are an important accessory in louboutin shoes autumn and winter, but this cheap christian louboutin year is obviously more dazzling than in previous nike outlet years. Almost all major international brands of clothing show take red bottom shoes boots as foot items, and have launched a variety of christian louboutin shoes styles. Look at the Fashionable red bottom shoes Boots brought by ANNA SUI 06, full of elegant and handsome features, and adidas superstar quickly prepare a few pairs of cheap christian louboutin boots with such characteristics for yourself. The principle of long-legged beauty's boots, whether it is the short boots that just cover the ankle, the middle boots that end in one-second of the calf, or the red bottom shoes long boots that end in the knee with the sole wrapped in christian louboutin outlet nike outlet online the sole, can make the louboutin shoes long-legged beauty the air max focus of the public as nike factory store long as the boots that match the overall shape. In leisure, louboutin shoes you might as well use retro red bottom heels low-waist jeans + boots. Birthday parties, dances and other nike store exciting occasions: a nike factory store sexy jordan 11 skirt + tasteful boots, knee skirt + boots in the middle is nike outlet online the classic dress cheap jordans of long-legged beauty. Short-legged Beauty's Shoe Principle Skirt and shoe barrel should air max not end in the thickest cheap christian louboutin shoes part of the christian louboutin outlet christian louboutin sale nike outlet calf. It is best to match the same color boots or boots, and let the skirt cover the upper nike store edge of the boots, so jordan 5 that the line of the lower body in one go. If you want to jordans for sale wear a short skirt, you'd nike outlet store better nike air max wear boots, because the beautiful and tangible lines of boots can nike factory outlet make you look long. When nike factory store wearing short skirts, we should jordans on sale pay attention to the tightness of boots. Short nike factory store skirts nike roshe run + cheap jordan shoes boots jordan 11 will red bottom heels make the line christian louboutin shoes of legs particularly obvious, so boots should air max be well red bottom heels balanced from ankle to knee. Avoid wearing tight pants or stuffing them into boots. The nike roshe run principle of wearing boots is that the skirt of a adidas nmd petite beauty is the same color as the boots, and it covers the upper edge of the christian louboutin sale boots. The whole leg will not appear adidas nmd cut lines, and the lower body will look taller naturally. When wearing short boots, the woolen socks should be tied with cheap christian louboutin jordans on sale the skirt nike outlet or trousers of the lower body in the jordans for sale same christian louboutin shoes color, so that the line red bottom heels of the lower body appears slender. nike shoes If nike outlet store you choose the same color boots and skirts, you can use the matching way of nike roshe run the upper and lower color of the jacket and boots, such as wearing a white sweater, a coffee skirt, and nike outlet a pair nike shoes of white boots, which can create a more beautiful line proportion for the upper and adidas outlet lower body. nike outlet Inviato da: Mabel il: 2019-04-10 15:37:53.058211 Scrivi un commento:
|
|
||||||||||||||
Inviato da: Linu Tudor il: 2019-07-31 18:13:54.968749
Inviato da: Conny Stahl il: 2019-10-17 18:16:22.452156