THE MYSTERY OF CABLE LENGTH
RULES IS SOLVED!

10Base5 (Thicknet) "Maximum Segment Length" 500 meters
10Base2 (Thinnet) "Maximum Segment Length" 185 meters
10BaseT (Cat 3 UTP) maximum
Hub to DTE distance 100 meters
10BaseFL (fiber optic) maximum distance is 2000 meters
100BaseTX (Cat 5 UTP) maximum distance is 100 meters
100BaseFX (62.5 micrometer Multimode Fiber) 400 meters
The mystery is explained: