![]() Maximum length is 100 meters and minimum length between nodes is 2.5 meters. The TX (sometimes referred as "T" only) means it's a CAT5 UTP straight through cable using two of the four available pairs and supports speeds up to 100 Mb. All 100MB rated cables, except the 100Base-FX, use CAT5 cable. For more information, see the " UTP -Unshielded Twisted Pair" page where you can find information on pinouts for the cables. The 100Base-T is used sometimes to refer to the 100Base-TX cable specification. For example, UTP has twisted pairs and this is the cable used in such cases. This shows the structure of the cable and tells us it contains pairs which are twisted. The "T" refers to "Twisted Pair" physical medium that carries the signal. This is the reason cable modem users notice a slowdown in speed when they are connected on a busy node, or when their neighbor is downloading all the time at maximum speed! Of course with Ethernet you will notice a slowdown in speed but it will be smaller in comparison to broadband. Baseband is the type of communication used by Ethernet and it means that when a computer is transmitting, it uses all the available bandwith, whereas Broadband (cable modems) shares the bandwidth available. In practice though, you wouldn't get more than 4 Mbps. The 100 MHz speed translates to 100Mbit per second, which in theory means 12 Mbps. If you try to use this type of cable for greater frequencies (and, therefore, speeds) it will either not work or become extremely unreliable. The greater the MHz, the greater speeds the cable can handle. The number 100 represents the frequency in MHz (Mega HertZ) for which this cable is made. We are going to break the "100Base-T" into three parts so we can make it easier to understand: 100 The 100Base-TX cable provides fast speeds up to 100Mbits and is more reliable since it uses CAT5e cable ( see the CAT 1/2/3/4/5 page).There is also 100Base-T4 and 100Base-FX available, which we discuss at the end of this article. ![]() The 100Base-TX (sometimes referred to 100Base-T) cable was until 2010 perhaps the most popular cable around since it has actually replaced the older 10Base-T and 10Base-2 (Coaxial). ![]()
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