Definition of 10Base5 in The Network Encyclopedia.
How a 10Base5 network Works
10Base5 networks are wired together in a bus topology—that is, in a linear fashion using one long cable. The maximum length of any particular segment of a 10Base5 network is 500 meters, hence the 5 in 10Base5. If distances longer than this are required, two or more segments must be connected using repeaters. Altogether, there can be a total of five segments connected using four repeaters, as long as only three of the segments have stations (computers) attached to them. This is referred to as the 5-4-3 rule.
A 10Base5 segment should have no more than 100 stations wired to it. These stations are not connected directly to the thicknet cable as in 10Base2 networks. Instead, a transceiver is attached to the thicknet cable, usually using a cable-piercing connector called a vampire tap. From the transceiver, a drop cable is attached, which then connects to the network interface card (NIC) in the computer. The minimum distance between transceivers attached to the thicknet cable is 2.5 meters, and the maximum length for a drop cable is 50 meters. Thicknet cable ends have N-series connectors soldered or crimped on them for connecting segments together.
10Base5 networks were often used as backbones for large networks. In a typical configuration, transceivers on the thicknet backbone would attach to repeaters, which would join smaller thinnet segments to the thicknet backbone. In this way, a combination of 10Base5 and 10Base2 standards could support sufficient numbers of stations for a moderately large company.
10Base5 networks are legacy networks that are no longer implemented, although some companies might choose to maintain them for cost reasons. The complexity and bandwidth limitations of 10Base5 networks render them obsolete. If you are wiring an office for a small LAN with low bandwidth requirements, use 10BaseT instead. For moderate to high bandwidth requirements, try using Fast Ethernet. If you are implementing a backbone for today’s high-speed enterprise networks, try using Gigabit Ethernet, Fiber Distributed Data Interface (FDDI), or some other advanced technology.
The two ends of a 10Base5 bus must be properly terminated. If they are not, signals will bounce and network communications will be impossible.