We have been discussing till yet many times about the Ethernet. There are some predefined standards of Ethernet Topologies. From which, 10BaseT is one of most popular standard. These standards are the variations of IEEE 802.3 Ethernet Specification.
There are following standards of 802.3 Specification:
1. 10Base2
2. 10Base5
3. 10BaseT
4. 10Base-FL
5. 100VG-AnyLAN
6. 100BaseX
In this article, only 10BaseT is discussed.
10BaseT
The trend in wiring Ethernet networks is to use unshielded twisted-pair (UTP) cable. 10BaseT, which uses UTP cable, is one of the most popular implementations for Ethernet. It is based on the IEEE 802.3 standard. 10BaseT supports a data rate of 10 Mbps using baseband.
10BaseT cabling is wired in a star topology. The nodes are wired to a central hub, which serves as a multiport repeater. A 10BaseT network functions logically as a linear bus. The hub repeats the signal to all nodes, and the nodes contend for access to the transmission medium as if they were connected along a linear bus. The cable uses RJ-45 connectors, and the network adapter card can have RJ-45 jacks built into the back of the card.
10BaseT segments can be connected by using coaxial or fiber-optic backbone segments. Some hubs provide connectors for Thinnet and Thicknet cables (in addition to 10BaseT UTP-type connectors).
By attachinga 10BaseT transceiver to the AUI port of the network adapter, you can use a computer set up for Thicknet on a 10BaseT network.
The star wiring of 10BaseT provides several advantages, particularly in larger networks. First, the network is more reliable and easier to manage because 10BaseT networks use a concentrator (a centralized wiring hub). These hubs are "intelligent" in that they can detect defective cable segments and route network traffic around them. This capability makes locating and repairing bad cable segments easier.
10BaseT enables you to design and build your LAN one segment at a time, growing as your network needs to grow. This capability makes 10BaseT more flexible than other LAN cabling options.
10BaseT is also relatively inexpensive to use compared to other cabling options. In some cases in which a data-grade phone system already has been used in an existing building, the data-grade phone cable can be used for the LAN.
NOTE: Networks with star wiring topologies can be significantly easier to troubleshoot and repair than bus-wired networks. With a star network, a problem node can be isolated from the rest of the network by disconnecting the cable and directly connecting it to the cable hub. If the hub is considered intelligent, management software developed for that hub type, as well as the hub itself, can disconnect the suspect port.
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