As defined earlier, there are sets of standards in IEEE model 802.3. 10Base5 is not another topology, but it defines the instruments and other goodies which will be used in the specific topology. For instance, you can say: "I went to England, Scotland, Wales, and Ireland"; this will not be a perfect statement, rather you should say: "I went to UK". UK includes every aspect you want to define. When you will say UK, everyone should understand that you are talking about United Kingdom that is in Europe and comprising on four component-countries including England, Scotland, Wales, and Ireland.
10Base5
The 10Base5 cabling topology (Thicknet) uses an external transceiver to attach to the network adapter card. The external transceiver clamps to the Thicknet cable. An Attachment Universal Interface (AUI) cables runs from the transceiver to a DIX connector on the back of the network adapter card. As with Thinnet, each network segment must be terminated at both ends, with one end using a grounded terminator.
The primary advantage of 10Base5 is its capability to exceed the cable restrictions that apply to 10Base2. 10Base5 does pose restrictions of its own. However, which you should consider when installing or troubleshooting a 10Base5 network. As with 10Base5 networks, the first consideration when troubleshooting a 10Base5 network should be the established cabling rules and guidelines. You must follow several additional guidelines, along with the 5-4-3 rule, when configuring Thicknet networks, such as the following:
1. The minimum cable distance between transceivers is 2.5 meters (8 feet).
2. You may not go beyond the maximum network segment length of 500 meters (1,640 feet).
3. The entire network-cabling scheme cannot exceed 2,500 meters (8,200 feet).
4. One end of the terminated network segment must be grounded.
5. Drop cables (transceiver cables) can be as short as required but cannot be longer than 50 meters from transceiver to computer.
6. The maximum number of nodes per network segment is 100. (This includes all repeaters).
The length of the drop cables (from the transceiver to the computer) is not included in measurements of the network segment length and total network length.
Backbone Configuration:
Thicknet and Thinnet networks are often combined, with a Thicknet backbone merging smaller Thinnet segments.
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