john2072
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Dołączył: 26 Sty 2011
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Skąd: England
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 Wysłany: Sob 9:35, 19 Mar 2011 Temat postu: Modems are the devices |
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yilai:
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dvance shape of the basic hub. In a basic hub all the computers are connected with the hub and the speed of the network is defined by the slowest computer network card connected. For example if you have 10/100 Mbps cards in a network and only one card of 10Mbps speed then the system cannot run faster than the 10 Mbps. Now if you have a switching hub in a network [link widoczny dla zalogowanych], it will allow all the faster connections in the network to r[link widoczny dla zalogowanych]in at the higher speed and still interact with the 10Mbps system.SWITCHES: Switch is a intelligence device than hub. Switch is a layer 2 device. Switch provides the same function as a hub or a bridge but it has the advance functionality of connecting the two computers together temporarily. Switch contains the switch matrix or switch fabric that can connect and disconnect ports. Unlike hubs [link widoczny dla zalogowanych], switch only transmit or forwards the data to the destined computer and it does not broadcasts the data to all its ports.MODEMS: Modems are the devices [link widoczny dla zalogowanych], which are used to translate the digital data into the analog format and vice versa. It performs the two main functions. Modulation and demodulation. A modulated data can travel across the conventional telephone lines.The modem modulates the signals at the sending end and demodulates
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