(
Fiber 
Optic 
Inter 
Repeater 
Link)  An IEEE fiber-optic Ethernet standard.  FOIRL and 10Base-F were compatible, but FOIRL was an earlier standard used to extend a backbone beyond the 328-foot limitation of 10Base-T.  FOIRL was limited to .6 miles, whereas 10Base-F extended to 1.2 miles and was a more comprehensive standard.  See 
10Base-F and 
Ethernet.