Additional information concerning 10base5
10base5 is sometimes referred to as thicknet because it uses a very thick coaxial cable. The 5 in 10base5 refers to the maximum length allowed for a single segment, which in this case is 500 meters. The 10base5 cable uses taps, sometimes referred to as vampire taps, to attach connections to the thicknet cable. Taps should never be placed closer than 2.5 meters from each other to prevent degraded signals.
The 10base5 specifications include:
A maximum of 100 taps per segment
A maximum of 5 connected segments. Segments are connected using a repeater
The maximum length of a complete 10base5 system cannot exceed 2.5 kilometers
A 10base5 system is normally configured in a bus configuration. Both ends of the cable must be terminated with a 50ohm terminator.