The interface specifications for the bnc and many other connectors are referenced in mil-std-348.  it features two bayonet lugs on the female connector; mating is fully achieved with a quarter turn of the coupling nut. Bnc connectors are used with miniature-to-subminiature coaxial cable in radio, television, and other radio-frequency electronic equipment, test instruments, and video signals. The bnc was commonly used for early computer networks, including arcnet , the ibm pc network , and the 10base2 variant of ethernet . Bnc connectors are made to match the characteristic impedance of cable at either 50 ohms or 75 ohms (with other impedances such as 93 ohms for arcnet available though less common). They are usually applied for frequencies below 4 ghz  and voltages below 500 volts.